CN105633113B - Organic light-emitting display device and its manufacturing method - Google Patents
Organic light-emitting display device and its manufacturing method Download PDFInfo
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Abstract
The invention discloses a kind of organic light-emitting display device and its manufacturing methods.The organic light-emitting display device includes: wherein to define red, green and blue pixel region substrate；The first electrode and hole transmission layer being formed on substrate；First in each of red on the hole transport layer, green and blue pixel region is formed to third luminous material layer；It is formed in first the first electron transfer layer to third luminous material layer；The first charge generating layers being formed on the first electron transfer layer；The second charge generating layers being formed on the first charge generating layers；The the 4th to the 6th luminous material layer being formed in each of the red on the second charge generating layers, green and blue pixel region；The second electron transfer layer being formed on the 4th to the 6th luminous material layer and the second electrode being formed on the second electron transfer layer.
Description
Technical field
The present invention relates to a kind of organic light-emitting display device and its manufacturing methods.
Background technique
As a kind of new panel display apparatus, organic light-emitting display device is self-emission display apparatus, and and liquid crystal
Show that (LCD) device is compared with preferable visual angle and contrast.Further, since organic light-emitting display device does not need individually to carry on the back
Light, thus can make organic light-emitting display device lighten with it is thinning, and organic light-emitting display device and LCD device and other put down
Plate display device, which is compared, has excellent power consumption.In addition, organic light-emitting display device is driven using low direct current (DC) voltage, have
Fast response time and manufacturing cost is low.
In organic light-emitting display device, electrons and holes are injected into luminous material layer from cathode and anode respectively, and
And emit light when wherein institute's injected electrons is transferred to ground state from excitation state with the mutually compound exciton in hole.In such case
Under, the type of organic light-emitting display device is divided into top emission type, bottom emission type according to the direction of the launch of light and double shines
Type, and according to driving classification of type at passive matrix and active array type.
Therefore, in organic light-emitting display device, when to arranged with matrix-type multiple sub-pixels supply scanning signal,
When data-signal and electric power, selected emission of light is to show image.In this case, every in multiple sub-pixels
One includes: thin film transistor (TFT) (TFT) comprising switch TFT, driving TFT and capacitor；And organic illuminating element, packet
It includes and is connected to first electrode, organic layer and second electrode including the driving TFT in TFT.
Recently, it is expected that the display device of high-resolution products group.In order to realize high-definition display device, need to increase every
The number of the pixel of unit area, and need high brightness.However, the limitation of the structure due to organic light-emitting display device, effect
Rate characteristic is limited and electric current increases.Therefore, the electrically and thermally stress of device is increased, the reliability of device is caused to reduce.
Therefore, in order to realize high-resolution product, to for overcoming the structure of organic light-emitting display device to limit
Method and for solving the problems, such as that power consumption increases, service life is reduced and the method for deteriorated reliability is studied.
Summary of the invention
Therefore, the present invention relates to a kind of organic light-emitting display device and its manufacturing method is provided, substantially avoid by
One or more problems caused by the limitation and disadvantage of the relevant technologies.
One aspect of the present invention is related to providing a kind of organic light-emitting display device and its manufacturing method, has for real
High brightness characteristic, long-life, higher efficiency and the improved reliability of the device of existing high-resolution products.
Other advantages of the invention and characteristic will be described partly in the description that follows, and those skilled in the art will
Hereafter make it by research partly and become it is obvious, or can practice through the invention and obtain.The purpose of the present invention
It can be achieved and obtained by the structure specifically noted in written description and its claim and attached drawing with other advantages.
In order to achieve these and other advantages and purpose according to the present invention, as implemented herein and describing extensively
, a kind of organic luminescent device is provided, the organic luminescent device include: wherein define red pixel area, green pixel area and
The substrate in blue pixel area；The first electrode and hole transmission layer being formed on substrate；Form red on the hole transport layer
In each of pixel region, green pixel area and blue pixel area and the first luminous material layer with different thickness,
Two luminous material layers and third luminous material layer；It is formed in the luminous material of the first luminous material layer, the second luminous material layer and third
The first electron transfer layer on the bed of material；The first charge generating layers being formed on the first electron transfer layer；It is formed in the first charge
The second charge generating layers in generation layer；Red pixel area, green pixel area and the blue being formed on the second charge generating layers
In each of pixel region and the 4th luminous material layer, the 5th luminous material layer and the 6th luminous material with different thickness
The bed of material；The second electron transfer layer being formed on the 4th luminous material layer, the 5th luminous material layer and the 6th luminous material layer；With
And it is formed in the second electrode on the second electron transfer layer.
In another aspect of the invention, a kind of method manufacturing organic light-emitting display device is provided, this method comprises:
The top of entire substrate forms first electrode, defines red pixel area, green pixel area and blue pixel area in a substrate；?
Hole transmission layer is formed in first electrode；Correspond to red pixel area, green pixel area and blue pixel on the hole transport layer
The corresponding position in area forms the first luminous material layer, the second luminous material layer and third luminous material layer, wherein first shines
Material layer, the second luminous material layer and third luminous material layer have different-thickness；In entire first luminous material layer, the second hair
The top of optical material layer and third luminous material layer forms the first electron transfer layer；In the upper rectangular of entire first electron transfer layer
At the first charge generating layers and the second charge generating layers；Correspond to red pixel area, green pixel on the second charge generating layers
The corresponding position in area and blue pixel area forms the 4th luminous material layer, the 5th luminous material layer and the 6th luminous material layer,
Wherein the 4th luminous material layer, the 5th luminous material layer and the 6th luminous material layer have different-thickness；It shines the entire 4th
The top of material layer, the 5th luminous material layer and the 6th luminous material layer forms the second electron transfer layer；And entire second
Second electrode is formed above electron transfer layer.
It should be understood that aforementioned general description of the invention and the following detailed description are all exemplary and illustrative, and
It is intended to provide further explanation of the invention as claimed.
Detailed description of the invention
Attached drawing shows embodiment of the present invention and together with the description for illustrating that the principle of the present invention, the present invention include
Attached drawing to provide a further understanding of the present invention, and attached drawing be incorporated herein in and constitute part of this application.Attached
In figure:
Fig. 1 is the sectional view for schematically showing general organic light-emitting display device；
Fig. 2 is the sectional view for schematically showing organic light-emitting display device according to an embodiment of the invention；
Fig. 3 to Fig. 5 be show based on comparative example according to prior art and embodiment according to the present invention manufacture it is organic
The figure of the life characteristic efficiency of the brightness of luminous display unit；And
Fig. 6 to Fig. 8 is the organic light emission for showing comparative example according to prior art and embodiment according to the present invention manufacture
The figure of the high temperature reliability evaluation of display device.
Specific embodiment
It reference will now be made in detail to exemplary implementation scheme of the invention now, exemplary implementation scheme of the invention be shown in attached drawing
Embodiment.Make to be referred to identical reference the same or similar component as far as possible through attached drawing.
Hereinafter, it will be described in detail with reference to the accompanying drawings embodiment of the present invention.Refer to through the identical appended drawing reference of attached drawing
For identical element.In the following description, when the detailed description of related known function or construction is determined as unnecessarily making the present invention
Emphasis it is fuzzy in the case where, the detailed description will be omitted.
Fig. 1 is the sectional view for schematically showing general organic light-emitting display device.
As shown in Figure 1, organic light-emitting display device 10 include: the first electrode 11 being formed on substrate, second electrode 18,
Cap rock 19 and the organic layer being formed between first electrode 11 and second electrode 18.Here, organic layer is passed including the first hole
Defeated layer 12, the second hole transmission layer 13 and third hole transmission layer 14, electron injecting layer 15, multiple luminous material layer 16R, 16G
With 16B and electron transfer layer 17.
Organic light-emitting display device 10 include wherein define the viewing area including multiple pixel regions substrate, be formed in it is more
Driving TFT in each of a pixel region and the protective layer being formed on driving TFT.Moreover, being formed with first electrode
11, first electrode 11 is connected to the drain electrode that the contact hole being formed in protective layer exposes, and is formed in first electrode 11
There is the organic layer including luminous material layer 16R, 16G and 16B with single layer structure.Second electrode is formed on organic layer
18。
As described above, luminous material layer is usually formed as single layer structure in organic light-emitting display device 10.
Fig. 2 is the sectional view for schematically showing organic light-emitting display device according to an embodiment of the invention.
As shown in Fig. 2, organic light-emitting display device 100 includes: to be sequentially formed to define red pixel area Rp, green picture
First electrode (anode) 110, hole transmission layer 120, the first luminous material layer on the substrate of plain area Gp and blue pixel area Bp
132R, the second luminous material layer 132G, third luminous material layer 132B, the first electron transfer layer 142, the first charge generating layers
152, the second charge generating layers 154, the 4th luminous material layer 134R, the 5th luminous material layer 134G, the 6th luminous material layer
134B, the second electron transfer layer 144, second electrode (cathode) 160 and cap rock 170.All components of device 100 are operatively
It couples and constructs.
In one embodiment, organic light-emitting display device 100 includes: intersected with each other to determine pixel region in ceiling substrate
The grid line and data line of each of Rp, Gp and Bp and the power supply extended in parallel selected from one of grid line and data line
Line, the grid line for each of being connected to pixel region Rp, Gp and Bp and data line switch TFT and be connected to switch TFT
Driving TFT.Here, driving TFT is connected to first electrode 110.Moreover, organic light-emitting display device 100 includes being formed in the
One electrode 110 and the organic layer between the second electrode 160 of first electrode 110.In this case, organic layer includes sky
Cave transport layer 120, the first luminous material layer 132R, the second luminous material layer 132G, third luminous material layer 132B, the first electronics
Transport layer 142, the first charge generating layers 152, the second charge generating layers 154, the 4th luminous material layer 134R, the 5th luminescent material
Layer 134G, the 6th luminous material layer 134B and the second electron transfer layer 144.
As described above, in organic light-emitting display device 100 according to an embodiment of the invention, luminous material layer by
Multilayer is formed.That is, multiple luminous material layers are formed in each of pixel region Rp, Gp and Bp, and therefore, Neng Gouti
High efficiency and life characteristic, to improve reliability.Therefore, the knot of general organic light-emitting display device is overcome through the invention
The limitation of structure, and can be realized high-resolution.
In this case, in organic light-emitting display device 100, luminous efficiency is based on microcavity effect, first electrode
The transmissivity of reflectivity and second electrode determines.Herein, it is contemplated that the light in each of pixel region Rp, Gp and Bp
Distance is learned, even if in the case where forming multiple luminous material layers as in the present invention, the overall thickness of organic layer should be with
Overall thickness including being formed as the organic layer of the luminous material layer of single layer structure is identical.
Hereinafter, organic light-emitting display device 100 according to an embodiment of the invention will be described in further detail
Element.However, following embodiment is merely illustrative the present invention, the present invention is not limited to following embodiments.
Firstly, substrate includes the multiple pixel regions divided by grid line (not shown) and data line (not shown), more
Driving TFT is formed in each of a pixel region.
Here, substrate can be formed by transparent glass material, or can be by aobvious for realizing flexibility with good flexibility
The plastics or polymer film for showing device are formed.
Although being not shown, SiO can also be formed on substrate2Or SiNxBuffer layer (not shown) with protect with
The driving element that process afterwards is formed such as leaks into the influence of the alkali metal ion of outside from impurity.
TFT includes driving TFT and switch TFT.Other than such element, it can also be formed for compensating driving TFT
Threshold voltage compensation circuit (that is, multiple capacitors), and can be freely disposed.In this case, TFT is driven
(not shown) is connected to switch TFT and by the control of switch TFT, can be applied according to the ON/OFF of driving TFT to adjust
To the voltage of first electrode 110.
First electrode 110 is anode electrode.Is independently formed in each sub-pixel and on protective layer (not shown)
One electrode 110, and first electrode 110 is connected to drain electrode.In this case, first electrode 110 should be used as and be included in
An electrode in multiple electrodes in organic light emission electrode light-emitting display device 100, therefore first electrode 110 can be by conduction
Property material is formed.First electrode 110 can be to be formed instead by Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr or combinations thereof object
Layer is penetrated later on reflecting layer by ITO, IGZO, IZO, IZTO, ZnO, ZTO, FTO, FZO, AZO, ATO, GZO or In2O3It is formed
Reflection multilayer electrode.For example, first electrode 110 can have multilayer, wherein the thickness of the compound comprising 90% or more Ag
Be formed asExtremelyAnd the thickness of ITO is formed asExtremely
Form organic layer between first electrode 110 and second electrode 160, and organic layer include transmitting feux rouges, green light,
The luminous material layer of blue light.
Here, organic layer can be by by stacking hole transmission layer, luminous material layer, charge generating layers and electron-transport
Layer and formed multilayer formed, the overall thickness of organic layer can beExtremely
In the present invention, organic layer can not be formed by single layer, and can be wherein in first electrode 110 and second electrode
Stacked light emitting material layer, charge generating layers or electron transfer layer the multilayered structure shape of non-once two or more times between 160
At.That is, luminous material layer, charge generating layers or electron transfer layer can be formed as at least two or more.
Hole transmission layer 120 can prevent the electronics generated from second electrode easily to luminescent layer transporting holes
It is moved to the part other than luminous zone, to improve luminous efficiency.That is, hole transmission layer 120 smoothly passes
Defeated hole, hole transmission layer 120 can be by N, N- dinaphthyl-N, N '-diphenylbenzidine (NPD), N, and N '-is bis--(3- methylbenzene
Base)-N, N '-is bis--(phenyl)-benzidine (TPD), 4- (9H- carbazole -9- base)-N, N- bis- [4- (9H- carbazole -9- base) phenyl] -
Aniline (TCTA), 4, "-three (the N-3- methylphenyl-N-phenyls-of-two carbazoles of 4 '-N, N '-biphenyl (CBP), s-TAD or 4,4 ', 4
Amino)-triphenylamine (MTDATA) formation.However, spirit of the invention is not limited thereto.
Luminous material layer 132R, 132G, 132B, 134R, 134G and 134B include matrix and dopant, and can be by sending out
The material for penetrating feux rouges, green light or blue light is formed.The luminescent material can be phosphor material or fluorescent material.In addition, luminescent material
The thickness of layer 132R, 132G, 132B, 134R, 134G and 134B can beIt arrives
Here, luminous material layer 132R and 134R include comprising click when luminous material layer 132R and 134R emit feux rouges
Azoles biphenyl (CBP) or 1, the host material of 3- bis- (carbazole -9- base) (mCP).Luminous material layer 132R and 134R, which can be, includes
The phosphor material of dopant, the dopant include to be selected from PIQIr (acac) (two (1- phenyl isoquinolin quinoline) acetylacetone,2,4-pentanedione iridium), PQIr
(acac) (two (1- phenylchinoline) acetylacetone,2,4-pentanedione iridium), three (1- phenylchinoline) iridium (PQIr) and octaethylporphyrin platinum (PtOEP)
One of or more, or be also possible to comprising PBD:Eu (DBM)3(Phen) or fluorescent material.However, of the invention
It is without being limited thereto.
When luminous material layer 132G and 134G emit green light, each of luminous material layer 132G and 134G include packet
Host material containing CBP or mCP.Luminous material layer 132G and 134G can be comprising containing Ir (ppy)3((the 2- phenyl of face formula three
Pyridine) iridium) dopant material phosphor material, or can be comprising Alq3The phosphor of (three (8-hydroxyquinoline) aluminium)
Material.However, the invention is not limited thereto.
When luminous material layer 132B, 134B emit blue light when, each of luminous material layer 132B, 134B include comprising
The host material of CBP or mCP.Luminous material layer 132B, 134B can be comprising containing (4,6-F2ppy)2Irpic or L2BD111
Dopant material phosphor material.
On the other hand, host material can be comprising selected from spiral shell-DPVBi, spiral shell -6P, diphenylethyllene benzene (DSB), hexichol
The phosphor material of one of vinyl arylene (DSA), PFO based polyalcohol and PPV based polyalcohol, however, the present invention is not limited thereto.
Charge generating layers 152 and 154 can be formed by bilayer, and be can be wherein N-type charge generating layers and be joined to P-
The P-N junction charge generating layers of type charge generating layers.P-N junction charge generating layers generate charge or hole and will be electrically separated, and
It charges injection into each of luminous material layer layer.That is, N-type charge generating layers 152 to first electrode it is adjacent first
Luminous material layer 132R, the second luminous material layer 132G and third luminous material layer 132B are for electron, p-type charge generating layers
154 to fourth luminous material layer 134R, fiveth luminous material layer 134G and sixth luminous material layer adjacent with second electrode 160
134B supplies hole.Therefore, it can be further improved the luminous effect of the organic light-emitting display device including multiple luminous material layers
Rate, furthermore, it is possible to reduce driving voltage.
Here, N-type charge generating layers 152 can be by forming doped with the organic material of metal or N type dopant.Metal can
To be selected from one of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, La, Ce, Sm, Eu, Tb, Dy and Yb material.
In this case, it can be used for the N type dopant and matrix of the organic material doped with N type dopant logical
Material used in often.For example, N type dopant can be alkali metal, alkali metal compound, alkaline-earth metal or alkaline-earth metal chemical combination
Object.In more detail, N type dopant can in Cs, K, Rb, Mg, Na, Ca, Sr, Eu and Yb one of.Host material can be with
It is selected from one of three -8-hydroxyquinoline aluminium, triazine, 8-hydroxyquinoline derivative, indole derivatives and thiophene cough up derivative material.
In addition, P-type charge generating layers 154 can be by forming doped with the organic material of metal or P-type dopant.Metal
It can be selected from one of Al, Cu, Fe, Pb, Zn, Au, Pt, W, In, Mo, Ni and Ti material.Moreover, for doped with p-type
Commonly used material can be used in the P-type dopant and matrix of the organic material of dopant.For example, P-type dopant can be with
It is to be selected from 2,3,5,6- tetra- fluoro- 7,7,8,8- tetracyano-p-quinodimethane (F4- TCNQ), 7,7,8,8- tetracyano-p-quinodimethanes
(TCNQ) derivative, iodine, FeCl3、FeF3And SbCl5One of material.In addition, matrix can be selected from N, the (naphthalene -1- of N '-two
Base)-N, N '-diphenyl-benzidine (NPB), N, N '-diphenyl-N, N '-bis- (3- aminomethyl phenyls)-(1,1 '-biphenyl) -4,4 ' -
Diamines (TPD) and N, N, N ', one of-four naphthalene benzidine (TNB) of N ' material.
Electron transfer layer 142 and 144 makes it possible to smoothly transmit and inject electronics, and in 142 He of electron transfer layer
Electron injecting layer can be independently formed on 144.Electron transfer layer 142 and 144 may include selected from three (8-hydroxyquinoline) aluminium
(Alq3), PBD, TAZ, spiral shell-PBD, one of BAlq and SAlq or more, but spirit of the invention is not limited to this.
In the present specification, the above organic layer has been depicted as including hole transmission layer, luminous material layer, charge generating layers
And electron transfer layer, but in hole transmission layer, luminous material layer and charge generating layers and electron transfer layer one of can save
Slightly.
Second electrode 160 can be formed above entire substrate and on organic layer.Here, second electrode 160 can be with
Be formed as double-layer structure, and therefore can be by metal selected from one of single/mono-, single/mixed, mixed/mono- and mixed/mixed double-layer structure
Material or inorganic material are formed.Metal material may include Ag, Mg, Yb, Li and Ca or inorganic material may include Li2O、
CaO, LiF and MgF2.Wherein metal and inorganic material mixing or metal and the layer of metal mixed can be with metals: inorganic material
Or metal: the ratio of metal 1: 1 to 1: 10 is formed.
Finally, cap rock 170 improves light extraction effect, and cap rock 170 can be by selected from the material for forming hole transmission layer
One of host material of material, the material for forming electron transfer layer and luminous material layer or more is formed.However, of the invention
Spirit be not limited to this.
Therefore, in organic light-emitting display device according to an embodiment of the invention, when according to selected color signal
When applying a certain voltage to first electrode 110 and second electrode 160, hole and electronics are transferred to organic layer to generate exciton.
Exciton is transferred to ground state from excitation state to generate light, and light is as VISIBLE LIGHT EMISSION.At this point, the light of transmitting passes through second electrode
160 are output to outside, to realize arbitrary image.
Implement encapsulation process to protect the Organic Light Emitting Diode of each sub-pixel from external action.In the present invention,
General film encapsulation method can be used.The film encapsulation method is well-known technology to those skilled in the art, because
This, does not provide its detailed description.
Hereinafter, the characteristic of organic light-emitting display device according to an embodiment of the invention is evaluated.
Firstly, following table 1 to table 3 is and to show the general organic light emission of Fig. 1 according to the comparative example of the prior art
The optical analog result of the organic light-emitting display device (" the embodiment of the present invention ") of display device (" comparative example ") and Fig. 2.And
And Fig. 3 to Fig. 5 is the organic light emitting display dress for showing comparative example according to prior art and embodiment according to the present invention manufacture
The figure for the life characteristic efficiency based on brightness set.
In this case, manufacture is aobvious according to the organic light-emitting display device of comparative example and organic light emission according to the embodiment
Showing device and test it is as follows.
Comparative example according to prior art
First electrode (ITO is formed on substrate/APC/ITO).In this case, first
Electrode has red (R) pixel region, green (G) pixel region and blue (B) pixel region.Pixel region is drawn by bank layer (not shown)
Point.Above entire first electrode formed NPD ().In this case, NPD () in first electricity
Extremely adjacent region (NPD) in doping 3% p-type dopant material (TCNQF4).Then, in green (G) pixel region
Formation TPD (), and formed in red (R) pixel region NPD ( ).Then, it is formed on the whole surface
TPD().In blue (B) pixel region to as blue substrate (BH) anthracene derivant () doping 5% pyrene
Derivative (blue dopant (BD)).In green (G) pixel region, two kinds of matrix (CBP and anthracene derivant) are mixed with 1: 1 ratio
Cooperation is green matrix (GH),The ppy as green dopant (GD) of upper doping 5%2Ir(acac).Moreover,
By being used as Red dopants to Be compound derivative (red matrix (RH)) doping 5% in red (R) pixel region
(RD) btp2Ir (acac) formationThen, on the whole surface with Mg: LiF (1: 1,)/Ag: Mg (3: 1,) ratio formed Alq3(), then, in Alq3On cap rock formed by NPD, the cap rock with a thickness of
The embodiment of the present invention
First electrode (ITO is formed on substrate/APC/ITO).In this case, first
Electrode has red (R) pixel region, green (G) pixel region and blue (B) pixel region.Pixel region is drawn by bank layer (not shown)
Point.Above entire first electrode formed NPD ().In this case, in the region (NPD adjacent with first electrode) in doping 3% p-type dopant material (TCNQF4).Then, derivative to the anthracene as BH in blue (B) pixel region
Object () doping 5% pyrene derivatives (BD).In green (G) pixel region, two kinds of matrix (CBP and anthracene derivant) are with 1
: 1 ratio mixing is used as GH, The ppy as GD of upper doping 5%2Ir(acac).In addition, red (R) as
Pass through the btp as RD to Be compound derivative (RH) doping 5% in plain area2Ir (acac) formation Then, exist
Alq is formed in whole surface3 Then, to formed electron transfer layer (ETL) anthracene derivant material ()
The Li of doping 2%.Then, on the whole surface formed NPD ().In this case, adjacent with electron transfer layer
Region (NPD) in doping 12% p-type dopant material (TCNQF4), and to conduct in blue (B) pixel region
BH anthracene derivant () again doping 5% pyrene derivatives (BD).Then, in green (G) pixel region, two kinds of bases
Ratio mixing of the matter (CBP and anthracene derivant) using 1: 1 as GH,Upper doping 5% is used as the ppy of GD2Ir
(acac).In addition, passing through the btp as RD to Be compound derivative (RH) doping 5% in red (R) pixel region2Ir
(acac) it is formedThen, by by Alq3It is mixed to form with LiQ with 1: 1 ratioBy by Mg and LiF
It is mixed to form with 1: 1 ratioBy the way that Ag: Mg is formed with 3: 1 ratioFormation NPD () make
For cap rock.
[table 1]
Blue (B) pixel region
[table 2]
Green (G) pixel region
[table 3]
Red (R) pixel region
It as shown in table 1 to table 3 and Fig. 3 to Fig. 5, is compared with comparative example, in the feelings of embodiment according to the present invention
Under condition, it can be seen that efficiency improves about 50%, service life and improves about 180% in blue pixel area.Furthermore, it is possible to
Find out, according to an embodiment of the invention, efficiency improves about 50% in green pixel area, and service life improves about
75%.Further, it is seen that according to an embodiment of the invention, efficiency improves about 90% in red pixel area, and use
Service life improves about 150%.
It is compared as described above, stacking primary structure with wherein luminous material layer, wherein luminous material layer stacks two
Secondary structure can greatly improve the efficiency and life characteristic of organic light-emitting display device.
Fig. 6 to Fig. 8 is to show organic hair of comparative example according to prior art and embodiment according to the present invention manufacture
The figure of the high temperature reliability evaluation of electro-optical display device.Under 3.2 inches of full HD (HD) states 70 DEG C at a temperature of implement 250
The test of hour, and high-temperature operation reliability is evaluated under the conditions of complete white.In this case, by measuring high temperature
Operation carries out high temperature reliability evaluation, and shows that service life is elongated, and hot properties is good under high temperature driven.In addition, because
It is very long for the service life under room temperature (25 DEG C), so implementing the evaluation of high temperature reliability by the acceleration of electric current.In Fig. 8
In, it is applied for the high electric current of the three times of the electric current applied in Fig. 5.
As shown in Figure 6 to 8, it is compared with the organic light-emitting display device of comparative example according to prior art, in root
In the case where organic light-emitting display device according to the present embodiment, it was demonstrated that the variable quantity (%) of the brightness based on time change is small.
As described above, in the organic light-emitting display device of embodiment according to the present invention, it can be seen that at high temperature
Reliability properties it is good.
Generally, due to the energy difference between second electrode and electron transfer layer and the electricity due to caused by the energy difference
The difference of sub- injection properties, when being driven at high temperature, electron mobility increase therefore, in luminous material layer or
The interface of the hole transmission layer adjacent with luminous material layer generates deterioration.With the increase of driving time, the slip of brightness
Than reducing faster under room temperature (25 DEG C).
However, luminous material layer is divided into the area Liang Ge in organic light-emitting display device according to embodiments of the present invention
Domain, and the region therefore wherein deteriorated can be dispersed.Due to the application of low current, so the quantity quilt of mobile electron
It reduces.That is, making high temperature driven operating reliability good due to characteristic that wherein electronics is readily injected into.
According to an embodiment of the invention, provide a kind of realization due to high brightness and have improve efficiency characteristic and
Service life, and at high temperature with the organic light-emitting display device of good reliability.It is thereby achieved that for overcoming
The high-resolution products of the limitation of the structure of general organic light-emitting display device.
It will be evident that those skilled in the art can make respectively under conditions of not departing from the spirit or scope of the present invention
Kind modification and change programme.Thus, the present invention is directed to cover to fall in the range of appended claims and its equivalent
Modification and change programme of the invention.
Claims (16)
1. a kind of organic light-emitting display device, comprising:
Substrate defines red pixel area, green pixel area and blue pixel area in the substrate；
Form first electrode on the substrate and hole transmission layer；
First luminous material layer, the second luminous material layer and third luminous material layer, first luminous material layer, described second
Luminous material layer and the third luminous material layer form the red pixel area on the hole transport layer, the green
In each of pixel region and the blue pixel area and there is different-thickness；
The first electricity being formed on first luminous material layer, second luminous material layer and the third luminous material layer
Sub- transport layer；
The first charge generating layers being formed on first electron transfer layer；
The second charge generating layers being formed on first charge generating layers；
4th luminous material layer, the 5th luminous material layer and the 6th luminous material layer, the 4th luminous material layer, the described 5th
Luminous material layer and the 6th luminous material layer are formed in the red pixel area on second charge generating layers, described
In each of green pixel area and the blue pixel area and there is different-thickness；
The second electricity being formed on the 4th luminous material layer, the 5th luminous material layer and the 6th luminous material layer
Sub- transport layer；And
The second electrode being formed on second electron transfer layer.
2. organic light-emitting display device according to claim 1, wherein first charge generating layers pass through to formation institute
The material doped N type dopant of the first electron transfer layer is stated to be formed.
3. organic light-emitting display device according to claim 1, wherein second charge generating layers pass through to formation institute
The material doped P-type dopant of hole transmission layer is stated to be formed.
4. organic light-emitting display device according to claim 1, wherein first luminous material layer and the 4th hair
Optical material layer is formed by red organic material.
5. organic light-emitting display device according to claim 1, wherein second luminous material layer and the 5th hair
Optical material layer is formed by green organic material.
6. organic light-emitting display device according to claim 1, wherein the third luminous material layer and the 6th hair
Optical material layer is formed by blue organic material.
It further include being formed in the hole transmission layer and described the 7. organic light-emitting display device according to claim 1
Hole injection layer between one electrode.
8. organic light-emitting display device according to claim 1 further includes the cap rock to be formed in the second electrode.
9. organic light-emitting display device according to claim 1, wherein being separately positioned on the red pixel area, described green
First luminous material layer, second luminous material layer and third hair in color pixel area and the blue pixel area
Optical material layer is configured to the light of transmitting different colours, is separately positioned on the red pixel area, the green pixel area and described
The 4th luminous material layer, the 5th luminous material layer and the 6th luminous material layer in blue pixel area are configured to
Emit the light of different colours, and
Wherein first luminous material layer in red pixel area and the 4th luminous material layer are configured to emit identical
The light of color, second luminous material layer and the 5th luminous material layer in green pixel area are configured to emit identical
The light of color, the third luminous material layer and the 6th luminous material layer in blue pixel area are configured to emit identical
The light of color.
10. a kind of method for manufacturing organic light-emitting display device, which comprises
First electrode is formed in the top of entire substrate, red pixel area, green pixel area and indigo plant are defined in the substrate
Color pixel area；
Hole transmission layer is formed on the first electrode；
Correspond to the phase in the red pixel area, the green pixel area and the blue pixel area on the hole transport layer
It answers and forms the first luminous material layer, the second luminous material layer and third luminous material layer at position, wherein the first luminous material
The bed of material, second luminous material layer and the third luminous material layer have different-thickness；
It is formed in the top of entire first luminous material layer, second luminous material layer and the third luminous material layer
First electron transfer layer；
The first charge generating layers and the second charge generating layers are formed in the top of entire first electron transfer layer；
Correspond to the red pixel area, the green pixel area and the blue pixel area on second charge generating layers
Corresponding position form the 4th luminous material layer, the 5th luminous material layer and the 6th luminous material layer, wherein the 4th hair
Optical material layer, the 5th luminous material layer and the 6th luminous material layer have different-thickness；
It is formed in the top of entire 4th luminous material layer, the 5th luminous material layer and the 6th luminous material layer
Second electron transfer layer；And
Second electrode is formed in the top of entire second electron transfer layer.
11. according to the method described in claim 10, wherein first charge generating layers pass through to formation first electronics
The material doped N type dopant of transport layer is formed.
12. according to the method described in claim 10, wherein second charge generating layers pass through to the formation hole transport
The material doped P-type dopant of layer is formed.
13. according to the method described in claim 10, wherein first luminous material layer and the 4th luminous material layer by
Red organic material is formed.
14. according to the method described in claim 10, wherein second luminous material layer and the 5th luminous material layer by
Green organic material is formed.
15. according to the method described in claim 10, wherein the third luminous material layer and the 6th luminous material layer by
Blue organic material is formed.
16. according to the method described in claim 10, further including before forming the hole transmission layer in the first electrode
Upper formation hole injection layer.
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| CN106449715A (en) * | 2016-11-09 | 2017-02-22 | 上海天马有机发光显示技术有限公司 | An organic light-emitting display panel and a manufacturing method thereof |
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| CN101006594A (en) * | 2004-08-20 | 2007-07-25 | 伊斯曼柯达公司 | White OLED having multiple white electroluminescent units |
| CN102024844A (en) * | 2009-09-15 | 2011-04-20 | 三星移动显示器株式会社 | Organic light-emitting display device |
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| CN101006594A (en) * | 2004-08-20 | 2007-07-25 | 伊斯曼柯达公司 | White OLED having multiple white electroluminescent units |
| CN102024844A (en) * | 2009-09-15 | 2011-04-20 | 三星移动显示器株式会社 | Organic light-emitting display device |
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