CN101867021A - Blue phosphorescent organic electroluminescent device and preparation method thereof - Google Patents
Blue phosphorescent organic electroluminescent device and preparation method thereof Download PDFInfo
- Publication number
- CN101867021A CN101867021A CN 201010201285 CN201010201285A CN101867021A CN 101867021 A CN101867021 A CN 101867021A CN 201010201285 CN201010201285 CN 201010201285 CN 201010201285 A CN201010201285 A CN 201010201285A CN 101867021 A CN101867021 A CN 101867021A
- Authority
- CN
- China
- Prior art keywords
- layer
- luminescent layer
- electro luminescent
- electrode
- organic electro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention provides a blue phosphorescent organic electroluminescent device, which comprises a substrate, a first electrode layer arranged on the substrate, one or a plurality of organic electroluminescent layers arranged on the first electrode layer, and a second electrode layer arranged on the organic electroluminescent layer. The thickness of the organic electroluminescent layer is 1nm-10nm. The organic electroluminescent layer is formed in a way that blue phosphorescent dye is doped in main body material with exciton diffusion length of 2nm-5nm. Since the organic electroluminescent layer main body material with exciton diffusion length of 2nm-5nm is used, thinner organic electroluminescent layer can be prepared on the basis of the full exciton utilization on the device, the voltage drop on the electroluminescent layer is reduced, the working voltage of the organic electroluminescent device is further reduced and the organic electroluminescent device can reach maximum power efficiency. The invention additionally provides a preparation method of the blue phosphorescent organic electroluminescent device.
Description
Technical field
The present invention relates to technical field of organic electroluminescence, be specifically related to a kind of blue phosphorescent organic electroluminescent device and preparation method thereof.
Background technology
Organic electroluminescence device (OLED) is a kind of current mode light emitting semiconductor device based on organic material.It has, and the material range of choice is wide, working voltage is low, brightness is high, the visual angle is wide, response is fast, temperature adapts to, can realize the characteristics such as full color demonstration from the blue light region to the red light district, can be widely used in the industrial production of flat-panel monitors such as digital camera, mobile phone, MP3.
Organic electroluminescence device comprises anode, organic electro luminescent layer and negative electrode at least.The luminescent layer of blue phosphorescent organic light emitting devices is entrained in the material of main part by blue emitting material and prepares, under effect of electric field, hole and electronics inject from anode and negative electrode respectively, are compounded to form exciton in luminescent layer, and the exciton attenuation sends blue phosphorescent.The organic electro luminescent layer thickness that traditional blue phosphorescent organic electroluminescent device uses is all more than 10nm, the thick more ability that it catches exciton of luminescent layer is just strong more, the utilance of exciton is just high more, and the external quantum efficiency of luminescent layer is just high more, and the power efficiency of organic electroluminescence device is just high more.
Discover that through the inventor optimum thickness of the luminescent layer of organic electroluminescence device is influenced by luminescent layer main body exciton diffusion length.Because the exciton diffusion length of organic electro luminescent layer material of main part is a definite value, the thickness with organic electro luminescent layer does not change, so luminescent layer is thick more, the pressure drop on the luminescent layer is high more, and operating voltage is high more, and external quantum efficiency is just low more; Opposite luminescent layer is thin more, though operating voltage has reduced, luminescent layer has also reduced the capture ability of exciton, and the utilance of exciton reduces, and external quantum efficiency also decreases.Proportional because of external quantum efficiency and power efficiency again, so luminescent layer exists an optimum thickness to realize maximum power efficiency.
The inventor considers by detecting the exciton diffusion length of organic electro luminescent layer material of main part, determine to use the organic electro luminescent layer thickness of described material of main part, satisfying under the thinnest prerequisite of organic electro luminescent layer, increasing the organic electroluminescence device power efficiency, reduce low-work voltage.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of blue phosphorescent organic electroluminescent device is provided, and can either reduce operating voltage, has high power efficiency again.
In order to overcome the above problems, the invention provides a kind of blue phosphorescent organic electroluminescent device, it is characterized in that, comprising: substrate; First electrode layer is arranged on described substrate;
On described first electrode layer, one or more layers organic electro luminescent layer is arranged;
On described organic electro luminescent layer, the second electrode lay is arranged;
Described organic electro luminescent layer thickness is 1nm～10nm; Described organic electro luminescent layer forms in exciton diffusion length is the material of main part of 2nm～5nm by blue phosphorescent is dye adulterated.
Preferably, described blue phosphorescent dyestuff is the compound shown in formula I, II, III or the IV:
Preferably, described material of main part is the compound shown in the formula V:
Preferably, between described organic electro luminescent layer and the described second motor layer, also have electronics to inject transport layer.
Preferably, described electronics injects transport layer by alkali metal and/or alkali metal carbonate-doped 1,3, and the electron transport material of forming in 5-three [(3-the pyridine radicals)-3-phenyl] benzene constitutes.
Preferably, between described first electrode layer and described organic electro luminescent layer, also comprise hole injection layer.
Preferably, between described hole injection layer and described organic electro luminescent layer, also comprise hole transmission layer and/or electronic barrier layer.
Preferably, between described organic electro luminescent layer and described electronics injection transport layer, also comprise hole blocking layer.
Preferably, between described electronics injection transport layer and described the second electrode lay, also comprise electron injecting layer.
The present invention also provides a kind of preparation method of blue phosphorescent organic electroluminescent device, comprising:
On substrate, form first electrode;
On described first electrode, form one or more layers organic electro luminescent layer;
On described organic electro luminescent layer, form second electrode;
Forming described organic electro luminescent layer thickness is 1nm～10nm; Described organic electro luminescent layer forms in exciton diffusion length is the material of main part of 2nm～5nm by blue phosphorescent is dye adulterated.
The invention provides a kind of blue phosphorescent organic electroluminescent device, comprising: substrate; First electrode layer is arranged on described substrate; On described first electrode layer, one or more layers organic electro luminescent layer is arranged; On described luminescent layer, the second electrode lay is arranged; Described organic electro luminescent layer thickness is 1nm～10nm; Described organic electro luminescent layer forms in exciton diffusion length is the material of main part of 2nm～5nm by blue phosphorescent is dye adulterated.The present invention uses the organic electro luminescent layer material of main part of exciton diffusion length as 2nm～5nm, can guarantee making full use of the thinner organic electro luminescent layer of preparation on the basis of exciton, thereby reduced the pressure drop of luminescent layer both sides, reduced the operating voltage of organic electroluminescence device, made organic electroluminescence device reach maximum power efficiency.
The present invention also provides a kind of preparation method of blue phosphorescent organic electroluminescent device, is included in and forms first electrode on the substrate; On described first electrode, form one or more layers organic electro luminescent layer; On described organic electro luminescent layer, form second electrode; Described organic electro luminescent layer thickness is 1nm～10nm; Described organic electro luminescent layer forms in exciton diffusion length is the material of main part of 2nm～5nm by blue phosphorescent is dye adulterated.Preparation method provided by the invention, preparation technology's simple controllable, the thickness of control organic electro luminescent layer reduces operating voltage, increases power efficiency.
Description of drawings
The structural representation of Fig. 1 organic electroluminescence device provided by the invention;
The cross-sectional view of Fig. 2 organic electroluminescence device provided by the invention;
Voltage-to-current density-brightness curve the figure of the blue phosphorescent organic electroluminescent device that Fig. 3 embodiment of the invention 1 provides;
The brightness of the blue phosphorescent organic electroluminescent device that Fig. 4 embodiment of the invention 1 provides-current efficiency curve chart;
The brightness of the blue phosphorescent organic electroluminescent device that Fig. 5 embodiment of the invention 1 provides-power efficiency curve chart;
Voltage-to-current density-brightness curve the figure of the blue phosphorescent organic electroluminescent device that Fig. 6 embodiment of the invention 2 provides;
The brightness of the blue phosphorescent organic electroluminescent device that Fig. 7 embodiment of the invention 2 provides-current efficiency curve chart;
The brightness of the blue phosphorescent organic electroluminescent device that Fig. 8 embodiment of the invention 2 provides-power efficiency curve chart;
Voltage-to-current density-brightness curve the figure of the blue phosphorescent organic electroluminescent device that Fig. 9 embodiment of the invention 3 provides;
The brightness of the blue phosphorescent organic electroluminescent device that Figure 10 embodiment of the invention 3 provides-current efficiency curve chart;
The brightness of the blue phosphorescent organic electroluminescent device that Figure 11 embodiment of the invention 3 provides-power efficiency curve chart;
Voltage-to-current density-brightness curve the figure of the blue phosphorescent organic electroluminescent device that Figure 12 embodiment of the invention 4 provides;
The brightness of the blue phosphorescent organic electroluminescent device that Figure 13 embodiment of the invention 4 provides-current efficiency curve chart;
The brightness of the blue phosphorescent organic electroluminescent device that Figure 14 embodiment of the invention 4 provides-power efficiency curve chart;
The exciton diffusion length matched curve figure of different subjects material thickness under the constant current density that Figure 15 embodiment of the invention provides.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiments of the invention are described, but should be appreciated that just restriction of these descriptions for further specifying the features and advantages of the present invention rather than patent of the present invention being required.
The invention provides a kind of blue phosphorescent organic electroluminescent device, comprising:
Substrate;
First electrode layer is arranged on described substrate;
On described first electrode layer, one or more layers organic electro luminescent layer is arranged;
On described luminescent layer, the second electrode lay is arranged;
Described organic electro luminescent layer thickness is 1nm～10nm; Described organic electro luminescent layer forms in exciton diffusion length is the material of main part of 2nm～5nm by blue phosphorescent is dye adulterated.
The present invention does not have specific (special) requirements to substrate, be preferably glass or flexible polymer, according to the present invention, described first electrode layer is an anode, for being easy to the material that the hole is injected, be preferably conducting metal or conducting metal oxide or transparent conductive polymer, include but not limited to nickel, platinum, gold, indium tin oxide (ITO) or indium-zinc oxide (IZO); The work function of described first electrode is preferably 4.7eV～5.2eV.
The organic electro luminescent layer number of plies that the present invention uses does not have particular restriction, and organic electro luminescent layer thickness is 1nm～10nm, is preferably 4nm～8nm.The organic electro luminescent layer that the present invention uses forms in the material of main part of exciton diffusion length as 2nm～5nm by blue phosphorescent is dye adulterated.Described blue phosphorescent dyestuff includes but not limited to formula I, II, compound shown in III or the IV, compound shown in the described formula I is two (4,6-difluorophenyl pyridine) iridium (2-carboxyl pyridine) (FIrpic), compound shown in the formula II is two (4,6-difluorophenyl pyridine) iridium [3-(trifluoromethyl)-5-(2-pyridine radicals)-1,2, the 4-triazole] (FIrtaz), compound shown in the formula III is two (4,6-difluorophenyl pyridine) iridium [5-(2-pyridine radicals)-1H-tetrazolium] (FIrN4), compound shown in the formula IV be two (4,6-difluorophenyl pyridine) iridium [four (1-pyrazolyl) boric acid] (Fir6).
According to the present invention, it is hole mobile material or the electron transport material of 2nm～5nm that the material of main part of organic electro luminescent layer is selected exciton diffusion length for use, and the present invention preferably uses 4,4, and 4-three (9-carbazyl) triphenylamine (TCTA) is the compound shown in the formula V.Described blue phosphorescent dyestuff and described material of main part are 0.08～0.2: 1 by weight.
According to the present invention, described the second electrode lay is a negative electrode, is preferably the metal of low-power function, includes but not limited to aluminium, magnesium, calcium, silver.
In order to reduce the driving voltage of organic electroluminescence device, make that to be injected with the electronics of organic electroluminescent layer by negative electrode comparatively rapid, organic electro luminescent layer and the second electrode lay between also comprise preferably that according to the present invention electronics injects transport layer.The thickness that electronics injects transport layer is preferably 30nm～40nm.Described electronics injects transport layer and preferably uses alkali metal well known in the art and/or alkali metal carbonate-doped 1,3, and formed electron transport material constitutes in 5-three [(3-the pyridine radicals)-3-phenyl] benzene (TmPyPB).Described alkali metal and/or alkali-metal carbonate can be Li, Cs, LiCO
3Or CsCO
3The present invention preferably uses LiCO
3, described LiCO
3With TmPyPB be 0.02～0.1: 1 by weight, be preferably 0.03～0.05: 1.
In order to improve organic electroluminescence device performance and efficient, between described first electrode layer and described organic electro luminescent layer, preferably include hole injection layer.Hole injection layer can reduce the contact resistance between first electrode layer and the organic electro luminescent layer, increases the injectability in hole.Described hole injection layer is water-soluble high-molecular material or the organic small molecule material with high hole injection efficiency, is preferably to gather 3,4-ethene dioxythiophene/polystyrolsulfon acid (PEDOT:PSS); With PEDOT:PSS is that hole injection layer uses expensive p dopant F4-TCNQ to need not, and can reduce cost, and described hole injection layer thickness is preferably 30nm～40nm.
In order to improve the transmission rate in hole, it is comparatively stable to make first electrode layer be injected with the hole of organic electroluminescent layer, the present invention preferably is provided with hole transmission layer between described hole injection layer and described organic electro luminescent layer, described hole transmission layer is selected from N well known in the art, N '-two (3-naphthyl)-N, N '-diphenyl-(1,1 '-diphenyl)-4,4 '-diamines (NPB) or N, N '-two (3-methyl)-N, N '-two (phenyl)-benzidine (TPD) etc. has the hole mobile material of benzidine structure, and the present invention preferably uses NPB.The thickness of described hole transmission layer is preferably 15nm～70nm
In order to stop exciton or electron transfer to hole transmission layer, the present invention preferably includes electronic barrier layer between described hole transmission layer and organic electro luminescent layer.Described electronic barrier layer preferably has the organic material of high triplet and certain hole transport electronics barrier properties, as TCTA well known in the art, N, and N '-two carbazyl-2,5-benzene (mCP), two (2-para-totuidine) cyclohexylbenzenes (TAPC).The present invention preferably uses TCTA.The thickness of described electronic barrier layer is 3nm～5nm.
According to the present invention, between described organic electro luminescent layer and described electronics injection transport layer, preferably include hole blocking layer, described hole blocking layer can blocking hole or exciton transition inject transport layer to electronics, can play simultaneously the effect of electric transmission, therefore select triplet such as hole barrier materials that ability and personnel know such as TmPyPB to form hole blocking layer greater than 2.7eV and hole barrier materials with good electrical transport factor.The thickness of described hole blocking layer is preferably 10nm～15nm.
In order to reduce the contact resistance between electronics injection transport layer and the second electrode lay, increase the injectability of electronics, the present invention injects between transport layer and the second electrode lay at described electronics and preferably includes electron injecting layer, described electron injecting layer is preferably alkali metal or alkali metal salt, includes but not limited to LiF, CsF, CsF
2, LiCO
3Or CsCO
3The thickness of described electron injecting layer is preferably 0.5nm～2nm.
Blue phosphorescent organic electroluminescent device provided by the invention as shown in Figure 1 and Figure 2, wherein Fig. 1 is the structural representation of blue phosphorescent organic electroluminescent device provided by the invention, and Fig. 2 is the generalized section of blue phosphorescent organic electroluminescent device provided by the invention.In the present embodiment, as depicted in figs. 1 and 2, blue phosphorescent organic electroluminescent device is connected in sequence by substrate 1, anode 2, hole injection layer 3, hole transmission layer 4, electronic barrier layer 5, organic electro luminescent layer 6, hole blocking layer 7, electronics injection transport layer 8, electron injecting layer 9 and negative electrode 10.
The present invention also provides a kind of preparation method of blue phosphorescent organic electroluminescent device, comprising: form first electrode on substrate;
On described first electrode, form one or more layers organic electro luminescent layer;
On described organic electro luminescent layer, form second electrode;
Described organic electro luminescent layer thickness is 1nm～10nm; Described organic electro luminescent layer forms in exciton diffusion length is the material of main part of 2nm～5nm by blue phosphorescent is dye adulterated.
At first on substrate, form first electrode, also can directly on ito glass or other conducting metals or other conducting polymers, carve first electrode according to method well known in the art.
After forming first electrode, on first electrode, form one or more layers organic electro luminescent layer, preferably use vacuum evaporation.Described light emitting layer thickness is preferably 1nm～10nm, and to select exciton diffusion length for use be the material of main part of 2nm～5nm.On organic electro luminescent layer, utilize vacuum evaporation to form second electrode at last.
In order better to improve the performance of organic electroluminescence device, the present invention has formed the electric transmission implanted layer between described organic electro luminescent layer and described second electrode.The present invention does not have particular restriction to the method that forms electronics injection transport layer on organic electro luminescent layer, be preferably vacuum evaporation, during vacuum evaporation, alkali metal and/or alkali-metal carbonate and TmPyPB are evaporated simultaneously, and be deposited on simultaneously on the organic electro luminescent layer, form electronics and inject transport layer.
The present invention also preferably forms hole injection layer on described first electrode, the formation method of described hole injection layer is preferably spin coating, for hole injection layer is spin-coated on first electrode uniformly, before spin coating, preferably described first electrode is cleaned and dry up with nitrogen, use plasma treatment 2min～5min then, in order to make the hole injection layer material form uniform one deck, after spin coating, preferably described substrate, first electrode, hole injection layer are toasted, baking temperature is 100 ℃～120 ℃, and stoving time is preferably 30min～60min.
According to the present invention, preferably on described hole injection layer, once form hole transmission layer and/or electronic barrier layer, on organic electro luminescent layer, form hole blocking layer, on described electronics injection transport layer, form electron injecting layer, the all preferred vacuum evaporation of the formation method of hole transmission layer, electronic barrier layer, hole blocking layer, electron injecting layer, vacuum evaporation is 1～5 * 10 in vacuum degree
-4Under carry out.
According to the present invention, the evaporation rate of the organic material in hole transmission layer, electronic barrier layer, organic electro luminescent layer and the hole blocking layer is controlled at 0.05nm/s～0.2nm/s, the evaporation rate of blue phosphorescent dyestuff can be 0.008nm/s～0.01nm/s, the alkali metal in the electric transmission implanted layer or the evaporation rate of alkali-metal carbonate are preferably 0.005nm/s～0.01nm/s, when organic electro luminescent layer is mixed, blue phosphorescent dyestuff and motif material while evaporation in preferred different evaporation sources, used evaporation source the present invention does not limit.
In order further to set forth the present invention, below will introduce the solution of the present invention in detail with specific embodiment.
At first introduce the assay method of organic electro luminescent layer material of main part exciton diffusion length: the following organic electroluminescence device of structure for example:
ITO|MoO
3(10nm) | NPB (80nm) | TCTA (5nm) | TCTA:8%FIrpic (d-xnm) | TCTA (x nm) | TPBi (45nm) | LiF (1nm) | the main recombination region of this device architecture of AL (100nm) at TCTA and TPBi at the interface, this exciton that generates at the interface can spread to the organic electro luminescent layer direction.Equation according to exciton density can obtain an exciton CONCENTRATION DISTRIBUTION according to exponential damping, and this expression formula is:
n(x)＝n(0)exp(-x/L
d)
Wherein, n (x) is the exciton density apart from recombination region x nanometer, and n (0) is the exciton density of main recombination region, L
dExciton diffusion length for material of main part.
Thereby we can be expressed as the luminous intensity of test component under constant current density of preparation:
I(x)＝I(0)L
d(exp(-x/L
d)-exp(-d/L
d))
Here, I (x) is that the main recombination region of luminescent layer distance distance is the luminous intensity of x nanometer, and I (0) is the luminous intensity of the device of TCTA pure in the middle of not having, and d is the thickness sum that light emitting layer thickness adds the pure TCTA between luminescent layer and the TPBi.
Utilize (the 0.9 milliampere every square centimeter) match under constant current density of the device with different-thickness x to preparation of this formula, the matched curve that obtains as shown in figure 15.Obtain L
dBe 2.77 ± 0.27 nanometers.Figure hollow core circle is represented test data, and dash line is represented the fitting data line.
Embodiment 1:
Earlier the ITO on the ito glass is photo-etched into the electrode that 4mm is wide, 30mm is long, uses oxygen plasma treatment 2 minutes after then described electrode being cleaned, drying up with nitrogen; Described electrode is placed on the spin coating instrument, as hole injection layer, behind the spin coating 1min, described electrode was toasted 30 minutes under 120 ℃ temperature with the speed PEDOT:PSS that spin coating one deck 30nm is thick on described electrode of 3000 commentaries on classics/min; Then 4 * 10
-5The NPB hole transmission layer that vacuum evaporation 50nm is thick on hole injection layer under the Pa pressure, the evaporation rate of NPB are 0.1nm/s; The TCTA electronic barrier layer that vacuum evaporation 5nm is thick on hole transmission layer, the evaporation rate of TCTA are 0.1nm/s; The FIrpic that vacuum evaporation 1nm is thick on electronic barrier layer is entrained in the luminescent layer of forming among the TCTA, and the evaporation rate of FIrpic is 0.015nm/s, with the mass percent of TCTA be 15%; The TmPyPB hole blocking layer that vacuum evaporation 15nm is thick on luminescent layer, the evaporation rate of TmPyPB are 0.1nm/s; The electronics of the lithium carbonate doping TmPyPB that vacuum evaporation 35nm is thick on hole blocking layer injects transport layer, and the evaporation rate of lithium carbonate is 0.003nm/s, and the evaporation rate of TmPyPB is 0.1nm/s; Inject the thick lithium carbonate electron injecting layer of vacuum evaporation 1nm on the transport layer at electronics, the evaporation rate of lithium carbonate is 0.005nm/s; Pass through the thick Al of mask plate vacuum evaporation 100nm as negative electrode on electron injecting layer, the evaporation rate of Al is 1nm/s, and obtaining the luminous zone area is 16mm
2, white light organic electroluminescent device with following structure:
ITO/PEDOT:PSS(30nm)/NPB(50nm)/TCTA(5nm)/TCTA:FIrpic(1nm)/TmPyPB(15nm)/TmPyPB:Li
2CO
3(35nm)/Li
2CO
3(1nm)/Al(100nm)。
Described blue phosphorescent organic electroluminescent device is carried out performance test, and as shown in Figure 3, black color dots is the current density value of different voltage correspondences, the brightness value of the different voltage correspondences of white point correspondence.A bright voltage of the organic electroluminescence device of present embodiment preparation is 2.6V, and high-high brightness is 48000cd/m
2, the brightness when 3.5V voltage is 1000cd/m
2As shown in Figure 4, the maximum current efficient of organic electroluminescence device is 40cd/A, and as shown in Figure 5, the maximum power efficiency of device is 421m/A, and brightness is 1000cd/m
2Efficient be 301m/W.
Embodiment 2:
Earlier the ITO on the ito glass is photo-etched into the electrode that 4mm is wide, 30mm is long, uses oxygen plasma treatment 2 minutes after then described electrode being cleaned, drying up with nitrogen; Described electrode is placed on the spin coating instrument, as hole injection layer, behind the spin coating 1min, described electrode was toasted 30 minutes under 120 ℃ temperature with the speed PEDOT:PSS that spin coating one deck 30nm is thick on described electrode of 3000 commentaries on classics/min; Then 4 * 10
-5The NPB hole transmission layer that vacuum evaporation 50nm is thick on hole injection layer under the Pa pressure, the evaporation rate of NPB are 0.1nm/s; The TCTA electronic barrier layer that vacuum evaporation 5nm is thick on hole transmission layer, the evaporation rate of TCTA are 0.1nm/s; The FIrpic that vacuum evaporation 4nm is thick on electronic barrier layer is entrained in the luminescent layer of forming among the TCTA, and the evaporation rate of FIrpic is 0.015nm/s, with the mass percent of TCTA be 15%; The TmPyPB hole blocking layer that vacuum evaporation 15nm is thick on luminescent layer, the evaporation rate of TmPyPB are 0.1nm/s; The electronics of the lithium carbonate doping TmPyPB that vacuum evaporation 35nm is thick on hole blocking layer injects transport layer, and the evaporation rate of lithium carbonate is 0.003nm/s, and the evaporation rate of TmPyPB is 0.1nm/s; Inject the thick lithium carbonate electron injecting layer of vacuum evaporation 1nm on the transport layer at electronics, the evaporation rate of lithium carbonate is 0.005nm/s; Pass through the thick Al of mask plate vacuum evaporation 100nm as negative electrode on electron injecting layer, the evaporation rate of Al is 1nm/s, and obtaining the luminous zone area is 16mm
2, white light organic electroluminescent device with following structure:
ITO/PEDOT:PSS(30nm)/NPB(50nm)/TCTA(5nm)/TCTA:FIrpic(4nm)/TmPyPB(15nm)/TmPyPB:Li
2CO
3(35nm)/Li
2CO
3(1nm)/Al(100nm)。
Described blue phosphorescent organic electroluminescent device is carried out performance test, and as shown in Figure 6, black color dots is the current density value of different voltage correspondences, the brightness value of the different voltage correspondences of white point correspondence.A bright voltage of the organic electroluminescence device of present embodiment preparation is 2.6V, and high-high brightness is 48000cd/m
2, the brightness when 3.5V voltage is 1000cd/m
2As shown in Figure 7, the maximum current efficient of organic electroluminescence device is 43cd/A, and as shown in Figure 8, the device maximum power efficiency is 471m/A, and brightness is 1000cd/m
2Efficient be 361m/W.
Embodiment 3:
Earlier the ITO on the ito glass is photo-etched into the electrode that 4mm is wide, 30mm is long, uses oxygen plasma treatment 2 minutes after then described electrode being cleaned, drying up with nitrogen; Described electrode is placed on the spin coating instrument, as hole injection layer, behind the spin coating 1min, described electrode was toasted 30 minutes under 120 ℃ temperature with the speed PEDOT:PS S that spin coating one deck 30nm is thick on described electrode of 3000 commentaries on classics/min; Then 4 * 10
-5The NPB hole transmission layer that vacuum evaporation 50nm is thick on hole injection layer under the Pa pressure, the evaporation rate of NPB are 0.1nm/s; The TCTA electronic barrier layer that vacuum evaporation 5nm is thick on hole transmission layer, the evaporation rate of TCTA are 0.1nm/s; The FIrpic that vacuum evaporation 7nm is thick on electronic barrier layer is entrained in the luminescent layer of forming among the TCTA, and the evaporation rate of FIrpic is 0.015nm/s, with the mass percent of TCTA be 15%; The TmPyPB hole blocking layer that vacuum evaporation 15nm is thick on luminescent layer, the evaporation rate of TmPyPB are 0.1nm/s; The electronics of the lithium carbonate doping TmPyPB that vacuum evaporation 35nm is thick on hole blocking layer injects transport layer, and the evaporation rate of lithium carbonate is 0.003nm/s, and the evaporation rate of TmPyPB is 0.1nm/s; Inject the thick lithium carbonate electron injecting layer of vacuum evaporation 1nm on the transport layer at electronics, the evaporation rate of lithium carbonate is 0.005nm/s; Pass through the thick Al of mask plate vacuum evaporation 100nm as negative electrode on electron injecting layer, the evaporation rate of Al is 1nm/s, and obtaining the luminous zone area is 16mm
2, white light organic electroluminescent device with following structure:
ITO/PEDOT:PSS(30nm)/NPB(50nm)/TCTA(5nm)/TCTA:FIrpic(7nm)/TmPyPB(15nm)/TmPyPB:Li
2CO
3(35nm)/Li
2CO
3(1nm)/Al(100nm)。
Described blue phosphorescent organic electroluminescent device is carried out performance test, and as shown in Figure 9, black color dots is the current density value of different voltage correspondences, the brightness value of the different voltage correspondences of white point correspondence.A bright voltage of the organic electroluminescence device of present embodiment preparation is 2.6V, and high-high brightness is 48000cd/m
2, the brightness when 3.5V voltage is 1000cd/m
2As shown in figure 10, the maximum current efficient of organic electroluminescence device is 47cd/A, and as shown in figure 11, the device maximum power efficiency is 5lm/A, and brightness is 1000cd/m
2Efficient be 381m/W.
Embodiment 4:
Earlier the ITO on the ito glass is photo-etched into the electrode that 4mm is wide, 30mm is long, uses oxygen plasma treatment 2 minutes after then described electrode being cleaned, drying up with nitrogen; Described electrode is placed on the spin coating instrument, as hole injection layer, behind the spin coating 1min, described electrode was toasted 30 minutes under 120 ℃ temperature with the speed PEDOT:PSS that spin coating one deck 30nm is thick on described electrode of 3000 commentaries on classics/min; Then 4 * 10
-5The NPB hole transmission layer that vacuum evaporation 50nm is thick on hole injection layer under the Pa pressure, the evaporation rate of NPB are 0.1nm/s; The TCTA electronic barrier layer that vacuum evaporation 5nm is thick on hole transmission layer, the evaporation rate of TCTA are 0.1nm/s; The FIrpic that vacuum evaporation 10nm is thick on electronic barrier layer is entrained in the luminescent layer of forming among the TCTA, and the evaporation rate of FIrpic is 0.015nm/s, with the mass percent of TCTA be 15%; The TmPyPB hole blocking layer that vacuum evaporation 15nm is thick on luminescent layer, the evaporation rate of TmPyPB are 0.1nm/s; The electronics of the lithium carbonate doping TmPyPB that vacuum evaporation 35nm is thick on hole blocking layer injects transport layer, and the evaporation rate of lithium carbonate is 0.003nm/s, and the evaporation rate of TmPyPB is 0.1nm/s; Inject the thick lithium carbonate electron injecting layer of vacuum evaporation 1nm on the transport layer at electronics, the evaporation rate of lithium carbonate is 0.005nm/s; Pass through the thick Al of mask plate vacuum evaporation 100nm as negative electrode on electron injecting layer, the evaporation rate of Al is 1nm/s, and obtaining the luminous zone area is 16mm
2, white light organic electroluminescent device with following structure:
ITO/PEDOT:PSS(30nm)/NPB(50nm)/TCTA(5nm)/TCTA:FIrpic(10nm)/TmPyPB(15nm)/TmPyPB:Li
2CO
3(35nm)/Li
2CO
3(1nm)/Al(100nm)。
Described blue phosphorescent organic electroluminescent device is carried out performance test, and as shown in figure 12, black color dots is the current density value of different voltage correspondences, the brightness value of the different voltage correspondences of white point correspondence.A bright voltage of the organic electroluminescence device of present embodiment preparation is 2.6V, and high-high brightness is 48000cd/m
2, the brightness when 3.5V voltage is 1000cd/m
2As shown in figure 13, the maximum current efficient of organic electroluminescence device is 43cd/A, and as shown in figure 14, the device maximum power efficiency is 5lm/A, and brightness is 1000cd/m
2Efficient be 371m/W.
More than a kind of blue phosphorescent organic electroluminescent device provided by the invention is described in detail; having used specific case herein sets forth principle of the present invention and execution mode; the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention; can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection range of claim of the present invention.
Claims (10)
1. a blue phosphorescent organic electroluminescent device is characterized in that, comprising:
Substrate;
First electrode layer is arranged on described substrate;
On described first electrode layer, one or more layers organic electro luminescent layer is arranged;
On described organic electro luminescent layer, the second electrode lay is arranged;
Described organic electro luminescent layer thickness is 1nm～10nm; Described organic electro luminescent layer forms in exciton diffusion length is the material of main part of 2nm～5nm by blue phosphorescent is dye adulterated.
2. organic electroluminescence device according to claim 1 is characterized in that, described blue phosphorescent dyestuff is the compound shown in formula I, II, III or the IV:
3. organic electroluminescence device according to claim 1 is characterized in that, described material of main part is the compound shown in the formula V:
4. organic electroluminescence device according to claim 1 is characterized in that, also has electronics to inject transport layer between described organic electro luminescent layer and the described second motor layer.
5. organic electroluminescence device according to claim 4 is characterized in that, described electronics injects transport layer by alkali metal and/or alkali metal carbonate-doped 1,3, and the electron transport material of forming in 5-three [(3-the pyridine radicals)-3-phenyl] benzene constitutes.
6. organic electroluminescence device according to claim 1 is characterized in that, also comprises hole injection layer between described first electrode layer and described organic electro luminescent layer.
7. organic electroluminescence device according to claim 6 is characterized in that, also comprises hole transmission layer and/or electronic barrier layer between described hole injection layer and described organic electro luminescent layer.
8. organic electroluminescence device according to claim 4 is characterized in that, also comprises hole blocking layer between described organic electro luminescent layer and described electronics injection transport layer.
9. organic electroluminescence device according to claim 4 is characterized in that, injects between transport layer and the described the second electrode lay at described electronics also to comprise electron injecting layer.
10. the preparation method of a blue phosphorescent organic electroluminescent device is characterized in that, comprising:
On substrate, form first electrode;
On described first electrode, form one or more layers organic electro luminescent layer;
On described organic electro luminescent layer, form second electrode;
Forming described organic electro luminescent layer thickness is 1nm～10nm; Described organic electro luminescent layer forms in exciton diffusion length is the material of main part of 2nm～5nm by blue phosphorescent is dye adulterated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010201285 CN101867021A (en) | 2010-06-17 | 2010-06-17 | Blue phosphorescent organic electroluminescent device and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010201285 CN101867021A (en) | 2010-06-17 | 2010-06-17 | Blue phosphorescent organic electroluminescent device and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101867021A true CN101867021A (en) | 2010-10-20 |
Family
ID=42958651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010201285 Pending CN101867021A (en) | 2010-06-17 | 2010-06-17 | Blue phosphorescent organic electroluminescent device and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101867021A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103378297A (en) * | 2012-04-25 | 2013-10-30 | 群康科技(深圳)有限公司 | Organic light emitting diode and display device including same |
| CN105870350A (en) * | 2016-06-17 | 2016-08-17 | 武汉华星光电技术有限公司 | Organic light-emitting device |
| CN105895820A (en) * | 2016-06-21 | 2016-08-24 | 武汉华星光电技术有限公司 | Organic light emitting device and display device thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1454448A (en) * | 2000-08-11 | 2003-11-05 | 普林斯顿大学理事会 | Organometallic compounds and emission-shifting organic electrophosphorescence |
| US20040110031A1 (en) * | 2002-11-26 | 2004-06-10 | Mitsuhiro Fukuda | Organic electroluminescent element and display |
| US20040137268A1 (en) * | 2002-12-27 | 2004-07-15 | Fuji Photo Film Co., Ltd. | Organic electroluminescent device |
| US20050170209A1 (en) * | 2004-02-02 | 2005-08-04 | Seok-Jong Lee | Ir compound and organic electroluminescent device using the same |
| CN101165051A (en) * | 2007-08-07 | 2008-04-23 | 中国科学院长春应用化学研究所 | Dendritic main body material and organic electroluminescence device prepared from the same |
-
2010
- 2010-06-17 CN CN 201010201285 patent/CN101867021A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1454448A (en) * | 2000-08-11 | 2003-11-05 | 普林斯顿大学理事会 | Organometallic compounds and emission-shifting organic electrophosphorescence |
| US20040110031A1 (en) * | 2002-11-26 | 2004-06-10 | Mitsuhiro Fukuda | Organic electroluminescent element and display |
| US20040137268A1 (en) * | 2002-12-27 | 2004-07-15 | Fuji Photo Film Co., Ltd. | Organic electroluminescent device |
| US20050170209A1 (en) * | 2004-02-02 | 2005-08-04 | Seok-Jong Lee | Ir compound and organic electroluminescent device using the same |
| CN101165051A (en) * | 2007-08-07 | 2008-04-23 | 中国科学院长春应用化学研究所 | Dendritic main body material and organic electroluminescence device prepared from the same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103378297A (en) * | 2012-04-25 | 2013-10-30 | 群康科技(深圳)有限公司 | Organic light emitting diode and display device including same |
| CN105870350A (en) * | 2016-06-17 | 2016-08-17 | 武汉华星光电技术有限公司 | Organic light-emitting device |
| CN105870350B (en) * | 2016-06-17 | 2018-01-30 | 武汉华星光电技术有限公司 | Organic luminescent device |
| CN105895820A (en) * | 2016-06-21 | 2016-08-24 | 武汉华星光电技术有限公司 | Organic light emitting device and display device thereof |
| US10147898B2 (en) | 2016-06-21 | 2018-12-04 | Wuhan China Star Optoelectronics Technology Co., Ltd | Organic light-emitting device and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104681731B (en) | A kind of Ca-Ti ore type electroluminescent device and preparation method thereof | |
| CN103715360B (en) | Organic electroluminescent device and display device | |
| CN105449112B (en) | Quanta point electroluminescent device, have its display device and lighting device | |
| CN108963087A (en) | Quanta point electroluminescent device and display | |
| CN105206715B (en) | A kind of QLED and preparation method thereof of exciton confinement structure | |
| CN101556988B (en) | Organic photolectronic device with an updoped gain layer and preparation method thereof | |
| CN110212102A (en) | Light emitting diode with quantum dots, preparation method and display device | |
| CN106920827B (en) | A kind of light emitting diode, array substrate, luminescent device and display device | |
| CN104335379B (en) | Organic electroluminescence device, the display comprising this organic electroluminescence device and luminaire | |
| Yang et al. | High‐performance red quantum‐dot light‐emitting diodes based on organic electron transporting layer | |
| Zhu et al. | Using an ultra-thin non-doped orange emission layer to realize high efficiency white organic light-emitting diodes with low efficiency roll-off | |
| CN101859881B (en) | Electronic transmission material, organic electroluminescent device and preparation method thereof | |
| CN102842685B (en) | Anode including metal oxide and the organic luminescent device with this anode | |
| CN102163696A (en) | Organic electroluminescent device taking quantum well structure as luminous layer | |
| WO2014187084A1 (en) | Organic electroluminescent component and display device | |
| CN101916830B (en) | White organic electroluminescent device and preparation method thereof | |
| CN101867021A (en) | Blue phosphorescent organic electroluminescent device and preparation method thereof | |
| CN105070845B (en) | A kind of organic electroluminescence device and preparation method thereof, display device | |
| Chen et al. | Single-layer triplet white polymer light-emitting diodes incorporating polymer oxides: Effect of charge trapping at phosphorescent dopants | |
| CN106025093B (en) | Organic Light Emitting Diode and preparation method thereof, display panel | |
| CN104183718A (en) | Organic light emission diode and preparation method thereof | |
| CN102956833A (en) | Organic electroluminescent device and preparation method thereof | |
| CN105845839A (en) | Inverted green light quantum dot film electroluminescence device | |
| CN102683597B (en) | White light electroluminescent device and preparation method thereof | |
| CN112331787A (en) | Application of metal tetraphenylporphyrin complex in electron transport material, quantum dot light-emitting device and preparation method thereof, and light-emitting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20101020 |