CN1937277A - Organic electroluminescent white light device - Google Patents
Organic electroluminescent white light device Download PDFInfo
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- CN1937277A CN1937277A CN 200610137754 CN200610137754A CN1937277A CN 1937277 A CN1937277 A CN 1937277A CN 200610137754 CN200610137754 CN 200610137754 CN 200610137754 A CN200610137754 A CN 200610137754A CN 1937277 A CN1937277 A CN 1937277A
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- Electroluminescent Light Sources (AREA)
Abstract
The organic EL device includes anode, cathode, and organic functional layer. The functional layer includes luminescent layer, and at least a color conversion and transmission layer. The color conversion and transmission layer includes at least a kind of color conversion material of possessing function for transferring carriers. Features are: high performance and stable white light, good properties of adjust and control, and simple technique of preparation.
Description
Technical field
The present invention relates to a kind of organic electroluminescence device, in particular, relate to a kind of pure white light organic electroluminescent device of colourity that adopts the preparation of new device structure.
Background technology
Now, along with the arriving of Development of Multimedia Technology and information-intensive society, more and more higher to the flat-panel monitor performance demands.In recent years emerging three kinds of Display Techniques: plasma display, Field Emission Display and display of organic electroluminescence have all remedied the deficiency of cathode ray tube and LCD to a certain extent.Wherein, a series of advantages such as display of organic electroluminescence has from main light emission, low-voltage DC driven, solidifies entirely, the visual angle is wide, color is abundant, response speed is 1000 times of LCD, its manufacturing cost but is lower than the LCD of equal resolution, therefore, display of organic electroluminescence has broad application prospects.
Display of organic electroluminescence (claims Organic Light Emitting Diode again, organic light-emitting diode, OLED) research starts from and adds the sixties in century, people such as Pope (Pope M, Kallmann HP, andMagnante R J.cHEM.PHYs., 1963,38,2042) reported first the electro optical phenomenon of green onion monocrystalline, opened the electroluminescent prelude of organic solid.1987, (C.W.Tang such as the researcher CW.Tang of Kodak, S.A.Vanslyke, APL.Phys.Lett., 1987,51,913) on the basis of summing up previous work, propose double-deck design philosophy, selected to have the derivative of tri-arylamine group and the 8 monohydroxy quinoline aluminum complex (Alq of better filming performance
3) respectively as hole transmission layer and luminescent layer (electron transfer layer of holding concurrently), obtained high-quantum efficiency (1%), high-luminous-efficiency (1.5lm/W), high brightness (＞1000cd/m
2) and low driving voltage (＜10V) organic electroluminescence device; Nineteen ninety, (Burroughes J such as the breadboard R.H.Friend of the Cavendish of Cambridge University, Bradley DDC, BrownAR, Friend RH, Nature (London), 1990,347,539) be that the luminescent layer material has been made polymer electroluminescent device with poly-phenylene vinylene (ppv) (PPV), opened up another frontier of luminescent device--thin polymer film electroluminescent device.These two breakthroughs make people see the potential hope of organic electroluminescence device as flat-panel display device of new generation.
Along with reaching its maturity of the luminous demonstration of monochrome, the research of full-color display spare also is surging forward, the flat-panel monitor of full color, large tracts of land, high information quantity is one of most important target of OLED development.Full-colour image shows needs to obtain continuously adjustable color in visible wavelength range, and organic electroluminescent realizes that the colored method that shows has following several at present:
A, prepare the trichromatic luminescence center of red, green, blue (being RGB) respectively, the luminous intensity of regulating three kinds of colors then is to realize different color combination.
The device that b, preparation emit white light obtains three primary colors by the colour filter film then, realizes colored the demonstration thereby reconfigure three primary colors.
The device of c, preparation blue light-emitting obtains ruddiness and green glow respectively by blue-light excited other luminescent material then, thereby further obtains colored the demonstration.
D, with red, green, blue luminescent device vertical stack, thereby realize colored the demonstration.
In said method, the technology in the method d preparation process is very complicated.Although the full color device existing procucts based on method a come out, accurate pixel preparation needs high-quality vaporization coating template, brings the difficulty of accurate contraposition thus, makes that resolution is difficult to improve.Method b, c do not need accurate pixel contraposition, and c compares with method, and method b biggest advantage is directly to use the colored filter of liquid crystal display (LCD).Therefore, people turn to sight white light to add the scheme of colour filter film one after another recently, and the high efficiency white light parts becomes a research focus in OLED field.
White organic electroluminescent research is because of its application prospects develops very fast.But also there are some technological difficulties in white color organic electroluminescence device, and for example: the luminous efficiency of device obtains the reasonable white light of colourity and not so good with adding driving voltage variation color stability under the high and low pressure not enough not too easily.
The method for preparing at present the white organic electroluminescent device mainly contains following several: sandwich construction method, look transformation approach, micro-cavity structure method or the like.
In adopting the white organic electroluminescent device of sandwich construction, general using blue light and another or two kinds of long wavelengths' light mixes the generation white light mutually as in gold-tinted, ruddiness, the green glow one or both, and the device architecture schematic diagram as shown in Figure 1.The problem of its existence is that the charge carrier recombination region changes with electric field change, easily causes the luminescent spectrum instability; Each luminescent layer rate of ageing is inconsistent, easily causes the illuminant colour coordinate offset; In order to realize white balance, each monochromatic luminescent layer is not an optimum structure all, causes overall efficiency low or the like.
The look transformation approach realizes that white light is the most popular method that inorganic LED realizes white light, is applied in fields such as backlight, illuminations.And GE (Duggal AR, Shiang JJ, Heller CM, et al.APPLIEDPHYSICS LETTERS 80 (19): 3470-3472 2002), Osram (Krummacher BC, ChoongVE, Mathai MK, et al.APPLIED PHYSICS LETTERS 88 (11): Art.No.1135062006) etc. company has successively reported that all employing look transformation approach realizes white light OLED.Its principle is that color converting layer has partially absorbed blue coloured electroluminous that OLED sends, and changes it into redness, orange, green luminescence generated by light, thereby carries out white light.The advantage of this method is that device architecture is simple, the device architecture schematic diagram as shown in Figure 2, the luminous control of device is good simultaneously, because of the luminous of its short wavelength is electroluminescence, the luminous of long wavelength is luminescence generated by light, the two relative intensity can be consistent, thereby luminescent spectrum is stable, thereby and can optimize luminescent device respectively and color converting layer is realized high efficiency white light.But what they adopted all is the method for device exogenic color conversion, promptly adds one deck color converting layer at blue light OLED device, need increase extra operation outside the OLED device preparing process like this, is unfavorable for reducing cost.
Summary of the invention
The present invention is intended to design a kind of white light OLED device that utilizes the look switch technology to realize, can obtain efficient, stable white light by adopting novel device architecture.
Organic electroluminescence device of the present invention, comprise anode, negative electrode and the organic function layer between it, comprise luminescent layer in the organic function layer, also comprise one deck look conversion transport layer at least simultaneously in the organic function layer, comprise a kind of look transition material that possesses the carrier transport function at least in this look conversion transport layer.
Look transition material among the present invention is a photoluminescence performance for both having had color transforming function simultaneously, possesses the carrier transport materials with function again, thereby guarantees that look conversion transport layer not only has photoluminescence performance but also possess the carrier transport function.
The look conversion transport layer that has hole transport performance and photoluminescence performance among the present invention simultaneously just is called look cavity for converting transport layer, and the look conversion transport layer that has electronic transmission performance and photoluminescence performance simultaneously just is called look conversion electron transport layer.
The carrier mobility of look transition material is greater than 10 among the present invention
-6Cm
2/ Vs, its absorbance is greater than 20%, and its photoluminescence efficiency is greater than 50%.Preferable material is that carrier mobility is greater than 10
-4Cm
2/ Vs, photoluminescence efficiency is greater than 80%.
Among the present invention, electroluminescent look conversion realizes by the emittance transmission look conversion transport layer to luminescent layer, the probability P r of conversion, and t follows down relation of plane:
Pr，t∝[A]χ
J
Wherein, J is the overlap integral of the emission spectrum of the absorption spectrum of conversion layer material and luminescent layer material, and χ is the thickness of conversion layer, and [A] is for effectively absorbing the concentration of the radiative material of luminescent layer in the conversion layer.It is luminous directly to capture charge carrier for fear of look conversion transport layer, thereby guarantees that look conversion transport layer is a luminescence generated by light, between look conversion transport layer and the luminescent layer one deck exciton or carrier barrier layer is arranged preferably.
So the present invention can also comprise the barrier layer in organic function layer, this barrier layer is between luminescent layer and look conversion transport layer, and its effect is to be used for stopping charge carrier or exciton.
Can also comprise a kind of dopant material at least in the look conversion transport layer of the present invention.
Dopant material can be luminescent dye, to improve the photoluminescence efficiency of look conversion transport layer; Dopant material also can be oxidizability (p type) transferring material or is reproducibility (n type) transferring material, to improve the transmission performance of look conversion transport layer.Dopant material also can comprise at least a luminescent dye, also comprises at least a oxidizability transferring material or at least a reproducibility transferring material simultaneously.
Can also comprise hole transmission layer and electron transfer layer respectively individually or simultaneously in the organic function layer of the present invention.
Look conversion transport layer material among the present invention is selected from naphtho-thiadiazole material, diazosulfide class material, naphtho-furodiazole material, benzo furodiazole material, 1-silicon for cyclopentadiene (abbreviating silole as) class material, poly aromatic ring class material etc.
Preferred particular compound comprises the 3-tert-butyl group-dinaphthyl anthracene (being called for short TBADN), rubrene (being called for short Rubrene), aphthacene (being called for short Tetracene), pentacene (being called for short Pentacene) perylene (being called for short Perylene), four uncle Ding Ji perylenes (being called for short TBP); benzene and perylene (be called for short Benzo[ghl] perylene), peropyrene (being called for short Peropyrene), 9,14-diphenyl-phenyl [5,6] indenyl [1,2,3-cd]-perylenes (abbreviation 9,14-Diphenyl-benz[5,6] indeno[1,2,3-cd] perylene), indenyl [1,2,3-cd]-perylenes (abbreviation Indeno[1,2,3-cd] perylene), BaP (be called for short Benzo[a] pyrene), dibenzo is bent and (is called for short Dibenzo[b, def] chrysene), naphtho-(2,3-) pyrene, dibenzo (a, l) pentacene (is called for short Dibenzo[a, l] pentacene), decacyclene (being called for short Decacyclene), rubicene (being called for short Rubicene), six benzos (bc, ef, hi, kl, mo, qr 〕 guan (is called for short Hexabenzo[bc, ef, hi, kl, mo, qr] coronene);
Dibenzo [fg, lj] naphtho-[1,2,3,4 ,-rst] pentaphene (be called for short BTPNTD, English full name is Dibenzo[fg, ij] naphtha[1,2,3,4-rst] pentaphene),
Dibenzo [fg, ij] phenanthro-[9,10,1,2,3-pqrst] pentaphene (be called for short BTPBTD, English full name is Dibenzo[fg, ij] phenanthro[9,10,1,2,3-pqrst] pentaphene),
4,9-two-[4-(2,2-diphenyl-vinyl)-phenyl]-naphtho-[2,3-c] [1,2,5] thiadiazoles (be called for short 4,9-bis-[4-(2,2-diphenyl-vinyl)-phenyl]-naphtho[2,3-c] [1,2,5] thiadiazole),
4,9-two-[4-(2,2-diphenyl-vinyl)-phenyl]-benzo [2,3-c] [1,2,5] thiadiazoles (be called for short 4,9-bis-[4-(2,2-diphenyl-vinyl)-phenyl]-benzo[2,3-c] [1,2,5] thiadiazole)
Concrete structural formula of compound is as shown below, but is not limited to above-mentioned material.
TBA DN Rubrene Tetracene Pentacene
Perylene TBP Benzo[ghf] Peropyrene 9，14-Diphenyl-benz[5，6]
perylene indeno[1，2，3-cd]perylene
Indeno[1，2，3- Benzo[a] Dibenzo[b， Naphtho[2，3- Dibenzo[a，l]
cd]perylene pyrene def]chrysene a]pyrene(NP) pentacene
Decacyclene Rubicene Hexabenzo Dibenzo[fg，ij] Dibenzo[fg，ij]Phen
[bc，ef，hi，kl，no， naphtho[1，2，3，4- anthro[9，10，1，2，3-
qr]coronene rst]pentaphene pqrst]pentaPhene
4，9-bis-[4-(2，2-diphenyl-vinyl)-phenyl]-naphtho[2，3-c][1，2，5]thiadiazole
4，9-bis-[4-(2，2-diphenyl-vinyl)-phenyl]-benzo[2，3-c][1，2，5]thiadiazole
OLED device of the present invention produces electroluminescence because of having only luminescent layer, thereby chromaticity coordinates is with change in voltage, can be because of the aging of luminescent layer do not change yet, thus can obtain efficient, stable white light; The present invention can guarantee charge carrier plural equilibrium in the luminescent layer by optimizing the structure of look conversion transport layer; OLED device control of the present invention is good, can regulate colour temperature, the color rendering index of white light by regulating luminescent layer, obtains high performance white light parts.In addition, the present invention because of noting be used in the independent look converting member of the outside preparation of OLED device, has simplified preparation technology with respect to the device of existing look transformational structure, greatly reduces production cost.
Description of drawings
Fig. 1 is the white organic electroluminescent device structural representation of sandwich construction in the prior art;
Fig. 2 is the white light organic electroluminescent device structural representation that the look transformation approach realizes in the prior art;
Fig. 3 is the device architecture schematic diagram of the embodiment of the invention 1;
Fig. 4 is the device architecture schematic diagram of the embodiment of the invention 3;
Fig. 5 is the device architecture schematic diagram of the embodiment of the invention 4;
Fig. 6 is the spectrogram of the embodiment of the invention 1;
Fig. 7 is the spectrogram of the embodiment of the invention 2;
Fig. 8 is the spectrogram of the embodiment of the invention 3;
Fig. 9 is the spectrogram of the embodiment of the invention 4;
Embodiment
Introduce specific embodiments of the present invention below in conjunction with accompanying drawing:
At first introduce the implication of icon in the Figure of description:
111 is blue-light device, and 112 is substrate of glass, and 113 is that device exogenic color conversion equipment 11 is anode, 12 is negative electrode, 2 is hole transmission layer, and 4 is electron transfer layer, and 3 is the barrier layer, 41 is blue light-emitting, 42 is the green luminescence layer, and 43 is red light luminescent layer, and 71 is that look cavity for converting transport layer, 72 is look conversion electron transport layer, 711 look conversion transport layers for the doping of p type, 721 look conversion transport layers for the doping of n type.
Be specific embodiments of the invention below:
Embodiment 1:
The structural representation of the organic electroluminescence device that present embodiment proposes is seen accompanying drawing 3, and the detailed step of preparation is as follows:
1) utilize the ultrasonic and ultrasonic method of deionized water of the washing agent boil that the transparent conduction base sheet ito glass is cleaned, and be placed under the infrared lamp oven dry, wherein the ITO above the conductive substrate is as the anode layer of device, and the square resistance of ITO film is 5 Ω, and thickness is 100.0nm;
2) ito glass behind the above-mentioned cleaning, drying being placed pressure is 1 * 10
-5In the vacuum chamber of pa, evaporation 5,6,11 on above-mentioned ITO film, 12-tetraphenyl aphthacene (abbreviating rubrene as), thickness are 100nm, as the look cavity for converting transport layer of device;
3) keep above-mentioned vacuum pressure constant, continue evaporation NPB on above-mentioned hole transmission layer, thickness is 20nm, as the barrier layer of device;
4) keep above-mentioned vacuum pressure constant, on above-mentioned barrier layer, continue the evaporation luminescent layer, wherein material of main part is 2,3,6,7-tetramethyl-9,10-two (1-naphthyl) anthracene (abbreviates α-TMADN) as, dopant dye is 2,3,6,7-tetramethyl-9,10-two (2-naphthyl) anthracene (abbreviates β-TMADN) as, adopt the method for double source evaporation to mix, respectively α-TMADN and β-TMADN are placed different evaporation sources, by controlling the evaporation speed of two evaporation sources, the doping ratio of regulating β-TMADN is 10%, prepares the blue light-emitting that thickness is 30nm;
5) keep above-mentioned vacuum pressure constant, on above-mentioned blue light-emitting, continue the Alq of evaporation 20nm
3As electron transfer layer;
6) keep above-mentioned vacuum pressure constant, continue evaporation Mg on above-mentioned electron transfer layer: Ag alloy-layer, Ag layer are as the cathode layer of device, and wherein the Mg in the alloy-layer, Ag evaporation speed ratio are 10: 1, and thickness is 50nm, and the Ag layer thickness is 120nm.
The specific performance of device is the table 1 of face as follows, and this embodiment shows and can realize device emission white light with single look cavity for converting transport layer.
Embodiment 2:
The detailed execution mode of preparation process of the organic electroluminescence device that present embodiment proposes is as follows:
1) utilize the ultrasonic and ultrasonic method of deionized water of the washing agent boil that the transparent conduction base sheet ito glass is cleaned, and be placed under the infrared lamp oven dry, wherein the ITO above the conductive substrate is as the anode layer of device, and the square resistance of ITO film is 5 Ω Ω, and thickness is 100.0nm;
2) ito glass behind the above-mentioned cleaning, drying being placed pressure is 1 * 10
-5In the vacuum chamber of Pa, evaporation prepares look cavity for converting transport layer on above-mentioned ITO film, the doping luminescent dye 4-4-dicyano methylene-2-tert-butyl group-6-(1 in look transition material Rubrene, 1,7,7-tetramethyl-julolidine-9-vinyl)-4H-pyrans (abbreviating DCJTB as), adopt the method for double source evaporation to mix, respectively DCJTB, Rubrene are placed different evaporation sources, by controlling the evaporation speed of two evaporation sources, the doping ratio of regulating DCJTB is 2%, and the gross thickness of this layer is 100nm;
3) keep above-mentioned vacuum pressure constant, continue evaporation NPB on above-mentioned hole transmission layer, thickness is 20nm, as the barrier layer;
4) keep above-mentioned vacuum pressure constant, on above-mentioned electron buffer layer, continue evaporation be doped with two-((2-(2 ', 4 '-difluoro)-phenyl)-pyridine)-blue light-emitting of (picoloy acid)-iridic compound (abbreviating FIrpic as), adopt the method for double source evaporation to mix, respectively with material of main part 9,9-two (4-two carbazoles-phenyl) fluorenes (abbreviating CPF as) place different evaporation sources with dyestuff Firpic, by controlling the evaporation speed of two evaporation sources, the doping ratio of regulating Firpic is 10%, and the thickness of this luminescent layer is 30nm;
5) keep above-mentioned vacuum pressure constant, on above-mentioned blue light-emitting, continue 4 of evaporation 40nm, 7-diphenyl-1,10-o-phenanthroline (abbreviating BPhen as) is as electron transfer layer;
6) keep above-mentioned vacuum pressure constant, continue evaporation Mg on above-mentioned exciton barrier-layer: Ag alloy-layer, Ag layer are as the cathode layer of device, and wherein the Mg in the alloy-layer, Ag evaporation speed ratio are 10: 1, and thickness is 50nm, and the Ag layer thickness is 120nm.
The specific performance of device is the table 1 of face as follows, and this embodiment shows, the luminescent dye that mixes in look cavity for converting transport layer can be realized device emission white light.
Embodiment 3:
The device architecture schematic diagram of present embodiment as shown in Figure 4, the detailed execution mode of preparation of devices step is as follows:
1) utilize the ultrasonic and ultrasonic method of deionized water of the washing agent boil that the transparent conduction base sheet ito glass is cleaned, and be placed under the infrared lamp oven dry, wherein the ITO above the conductive substrate is as the anode layer of device, and the square resistance of ITO film is 12 Ω, and thickness is 100.0nm;
2) ito glass behind the above-mentioned cleaning, drying being placed pressure is 1 * 10
-5Vacuum chamber in, the NPB of evaporation 40nm is as the hole transmission layer of device on above-mentioned ITO film;
3) keep above-mentioned vacuum pressure constant, on above-mentioned hole transmission layer, continue the blue light-emitting that evaporation is doped with Firpic, adopt the method for double source evaporation to mix, respectively material of main part CPF is placed different evaporation sources with dyestuff Firpic, by controlling the evaporation speed of two evaporation sources, the doping ratio of regulating Firpic is 10%, and preparation thickness is the 30nm luminescent layer;
4) keep above-mentioned vacuum pressure constant, on above-mentioned blue light-emitting, continue the BPhen of evaporation 10nm as the barrier layer;
5) keep above-mentioned vacuum pressure constant, evaporation is doped with the look conversion electron transport layer of Li on above-mentioned barrier layer, adopt the method for double source evaporation to mix, respectively Li is placed different evaporation sources with look transition material BTPNTD, by controlling the evaporation speed of two evaporation sources, the doping ratio of regulating Li is 50%, and thickness is 5nm;
6) keep above-mentioned vacuum pressure constant, on the look conversion transport layer of above-mentioned Doped n-type material, continue the look transition material BTPNTD of evaporation 80nm as look conversion electron transport layer;
7) keep above-mentioned vacuum pressure constant, continue evaporation Mg on above-mentioned look conversion electron transport layer: Ag alloy-layer, Ag layer are as the cathode layer of device, and wherein the Mg in the alloy-layer, Ag evaporation speed ratio are 10: 1, and thickness is 50nm, and the Ag layer thickness is 100nm.
The specific performance of device is the table 1 of face as follows, and this embodiment shows, can realize white light with the look conversion electron transport layer that the n type mixes.Color converting layer and barrier layer to carry out at the interface that the n type mixes be in order to reduce the electronics injection barrier.
Embodiment 4:
The device architecture schematic diagram of present embodiment is seen accompanying drawing 5, and the detailed execution mode of preparation of devices step is as follows:
1) utilize the ultrasonic and ultrasonic method of deionized water of the washing agent boil that the transparent conduction base sheet ito glass is cleaned, and be placed under the infrared lamp oven dry, wherein the ITO above the conductive substrate is as the anode layer of device, and the square resistance of ITO film is 12 Ω, and thickness is 100.0nm;
2) ito glass behind the above-mentioned cleaning, drying being placed pressure is 1 * 10
-5In the vacuum chamber of Pa, evaporation Rubrene on above-mentioned ITO film, thickness are 50nm, as look cavity for converting transport layer;
3) keep above-mentioned vacuum pressure constant, continue evaporation NPB on above-mentioned hole transmission layer, thickness is 20nm, as the barrier layer;
4) keep above-mentioned vacuum pressure constant, on above-mentioned electron buffer layer, continue the blue light-emitting that evaporation is doped with β-TMADN, adopt the method for double source evaporation to mix, respectively material of main part α-TMADN is placed different evaporation sources with dyestuff β-TMADN, by controlling the evaporation speed of two evaporation sources, the doping ratio of regulating β-TMADN is 10%, and the luminescent layer gross thickness is 30nm;
5) keep above-mentioned vacuum pressure constant, on above-mentioned blue light-emitting, continue the BPhen of evaporation 10nm as the barrier layer;
6) keep above-mentioned vacuum pressure constant, evaporation look conversion electron transport layer on above-mentioned barrier layer, adopt the method for double source evaporation to mix, respectively look transition material BTPNTD is placed different evaporation sources with BTPBTD, by controlling the evaporation speed of two evaporation sources, the doping ratio of regulating BTPNTD is 50%, and the thickness of this layer is 40nm;
7) keep above-mentioned vacuum pressure constant, continue evaporation Mg on above-mentioned look conversion electron transport layer: Ag alloy-layer, Ag layer are as the cathode layer of device, and wherein the Mg in the alloy-layer, Ag evaporation speed ratio are 10: 1, and thickness is 50nm, and the Ag layer thickness is 100nm.
The specific performance of device is the table 1 of face as follows, and this embodiment shows, can adopt look cavity for converting transport layer and look conversion electron transport layer simultaneously, thereby realizes the white light of the high color rendering index (CRI) of luminous stable color coordinate.
Device among the embodiment 1-4 is at 20mA/cm
2Under device performance such as following table 1, the electroluminescent spectrum of device is seen accompanying drawing 6-9, the device luminescent spectrum is not with change in voltage.
Table 1
| | Embodiment | 1 | |
|
|
| Driving voltage (V) | 6.2 | 8.5 | 9.1 | 7.4 | |
| Brightness (cd/m 2) | 1018 | 2923 | 2176 | 1361 | |
| Luminous efficiency (cd/A) | 5.1 | 14.5 | 10.9 | 6.8 | |
| CIE | 0.28，0.31 | 0.37，0.35 | 0.32，0.24 | 0.33，0.30 | |
| CRI | 70 | 49 | 45 | 93 |
Although describe the present invention in conjunction with the preferred embodiments, but the present invention is not limited to the foregoing description and accompanying drawing, should be appreciated that under the guiding of the present invention's design, those skilled in the art can carry out various modifications and improvement, and claims have been summarized scope of the present invention.
Claims (10)
1. organic electroluminescence device, comprise anode, negative electrode and the organic function layer between it, comprise luminescent layer in the organic function layer, it is characterized in that also comprising in the organic function layer one deck look conversion transport layer at least, comprise a kind of look transition material that possesses the carrier transport function at least in this look conversion transport layer.
2. organic electroluminescence device according to claim 1 is characterized in that the carrier mobility of described look transition material is greater than 10
-6Cm
2/ Vs, absorbance is greater than 20%, and photoluminescence efficiency is greater than 50%.
3. according to the organic electroluminescence device of claim 1 or 2, it is characterized in that the carrier mobility of described look transition material is greater than 10
-4Cm
2/ Vs, photoluminescence efficiency is greater than 80%.
4. organic electroluminescence device according to claim 1 is characterized in that, comprises a kind of dopant material at least in the described look conversion transport layer.
5. organic electroluminescence device according to claim 4 is characterized in that, described dopant material is a luminescent dye.
6. organic electroluminescence device according to claim 4 is characterized in that, described dopant material is the oxidizability transferring material or is the reproducibility transferring material.
7. organic electroluminescence device according to claim 4 is characterized in that described dopant material comprises at least a luminescent dye, also comprises at least a oxidizability transferring material or at least a reproducibility transferring material simultaneously.
8. organic electroluminescence device according to claim 1 is characterized in that, comprises the barrier layer in the described organic function layer, and this barrier layer is between luminescent layer and look conversion transport layer.
9. organic electroluminescence device according to claim 1, it is characterized in that, described look transition material preferably from naphtho-thiadiazole material, diazosulfide class material, Nai Bing oxadiazole class material, Ben Bing oxadiazole class material, 1-silicon for cyclopentadiene material, poly aromatic ring class material.
10. organic electroluminescence device according to claim 1 is characterized in that, comprises hole transmission layer individually or simultaneously or/and electron transfer layer in the described organic function layer.
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