CN1518400A - Organic luminous display panel - Google Patents
Organic luminous display panel Download PDFInfo
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- CN1518400A CN1518400A CNA031015743A CN03101574A CN1518400A CN 1518400 A CN1518400 A CN 1518400A CN A031015743 A CNA031015743 A CN A031015743A CN 03101574 A CN03101574 A CN 03101574A CN 1518400 A CN1518400 A CN 1518400A
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Abstract
An organic luminous display panel is composed of substrate and multiple display units on the substrate. Each display unit consists of transparent electric conducting layer, hole injection layer, hole transfer layer, organic luminescent layer and electric conducting layer. Said hole injection layer is made of the 4,4',4''-tri(nitrogen-2-naphthyl-nitrogen-phenylamine) triphenylamine layer doped by 5,6,11,12-tetraphenyl-naphthacene or its derivative.
Description
Technical field
The invention provides a kind of organic light emitting display (organic electroluminescent display, OLED) panel, especially refer to that a kind of utilization has been doped with 5,6,11,4,4 of 12-tetraphenyl-aphthacene or derivatives thereof ', 4 " three (nitrogen-2-naphthyl-nitrogen-phenylamino) triphenylamine layer is as the organic electroluminescence display panel of this hole injection layer.
Background technology
Along with making rapid progress of science and technology, organic material also is used in the various circuit element gradually widely, for example a kind of organic light emitting display of utilizing organic material to make, just with simple structure and splendid working temperature, contrast, visual angle and possess light-emitting diode is arranged (Light-emitting diode, LED) advantage such as the rectification and the characteristics of luminescence, and in the monitor market, attracted attention gradually.
Please refer to Fig. 1, Fig. 1 is the generalized section of known organic electroluminescence display panel 10, as shown in Figure 1, organic electroluminescence display panel 10 includes substrate (substrate) 12 and is located at the display unit (display unit) 14 that a plurality of matrix forms on the substrate 12 are arranged.Each display unit 14 is all the multiple-level stack structure, includes transparency conducting layer (transparent conductive) 16, hole injection layer (holeinjecting layer) 18, hole transport layer (hole transporting layer) 20, organic luminous layer (organicelectroluminescent layer) 22, electron transfer layer (electron transporting layer) 24 and conductive layer 26 and is stacked in regular turn on the substrate 12.
Wherein transparency conducting layer 16 is intended for anode (anode) and negative electrode (cathode) with conductive layer 26, and be electrically connected on power supply 17, generate electronics and hole respectively with the both sides up and down in organic luminous layer 22, it is active luminous by the combination in electronics and hole organic luminous layer 22 to be carried out again.And the function of hole injection layer 18, hole transport layer 20 and electron transfer layer 24 etc. mainly is to assist the generation and the transmission of hole or electronics, with the driving voltage of reduction organic light emitting display, and further improves display quality.
When making organic electroluminescence display panel 10, often need to use great variety of organic, therefore compare with other displays based on inorganic, LCD for example, organic light emitting display is in the useful life of often paying attention to material especially of choosing of material, even usually because of yielding to the useful life of material, and must use the relatively poor material of some display qualities, for example, normal cyanines copper (the Copper phthalcyanine that adopts in the process of known making organic light emitting display panel 12, CuPc) as the main material of making hole injection layer 18, yet by finding in some experiment tests by 4,4 ', 4 " three (nitrogen-2-naphthyl-nitrogen-phenylamino) triphenylamine (4; 4 '; 4 "-Tris (N-2-naphthyl-N-phenylamino) triphenyl amine, no matter 2T-NATA) hole injection layer of Gou Chenging all is better than the former in the performance of brightness or operating efficiency, but do not have industry applications because the latter's component life is too short, therefore still need use the relatively poor CuPC of display quality to make hole injection layer, cause the reduction of display quality.
Therefore, be as improving the composition structure of organic light emitting display, real with the display quality of further lifting organic light emitting display is current important research direction.
Summary of the invention
Main purpose of the present invention is to provide a kind of organic electroluminescence display panel, and it includes the hole injection layer that is made of the 2T-NATA layer that is doped with the rubrene or derivatives thereof, to address the above problem.
A kind of organic electroluminescence display panel is disclosed in most preferred embodiment of the present invention, it includes substrate and is located at this suprabasil a plurality of display units, and respectively this display unit includes transparency conducting layer, hole injection layer, hole transport layer, organic luminous layer and conductive layer are stacked in this substrate in regular turn, wherein this hole injection layer is by 4,4 ', 4 " three (nitrogen-2-naphthyl-nitrogen-phenylamino) triphenylamine layer constitutes; and be doped with 5,6,11; and (5; 6,11,12-tetraphenylnapthacene; rubrene) or derivatives thereof is to prolong the useful life of this organic electroluminescence display panel for 12-tetraphenyl-aphthacene.
Organic electroluminescence display panel of the present invention is to utilize the 2T-NATA layer that is doped with the rubrene or derivatives thereof to make to make hole injection layer, so can be when keeping component life, with preferable brightness and operating efficiency, to reach the effect of improving the organic light emitting display display quality.
Description of drawings
Fig. 1 is the generalized section of known organic electroluminescence display panel 10.
Fig. 2 is the generalized section of organic electroluminescence display panel 110 among the present invention.
Fig. 3 is the graph of a relation (J-V curve) of the current density versus voltage of different organic electroluminescence display panels.
Fig. 4 is the graph of a relation (B-V curve) of the luminance against voltage of different organic electroluminescence display panels.
Fig. 5 is the graph of a relation (E-V curve) of the luminous efficiency of different organic electroluminescence display panels to voltage.
Fig. 6 is component life test (lifetime test) figure of different organic electroluminescence display panels.
Illustrated symbol description
10 organic electroluminescence display panels, 12 substrates
14 display units, 16 transparency conducting layers
18 hole injection layers, 20 hole transport layers
22 organic luminous layers, 24 electron injecting layers
26 conductive layers, 110 organic electroluminescence display panels
112 substrates, 114 display units
116 transparency conducting layers, 118 hole injection layers
120 hole transport layers, 122 organic luminous layers
124 electron injecting layers, 126 conductive layers
Embodiment
Please refer to Fig. 2, Fig. 2 is the generalized section of organic electroluminescence display panel 110 in the preferred embodiment of the present invention, as shown in Figure 1, organic electroluminescence display panel 110 includes substrate (substrate) 112 and is located at the display unit 114 that a plurality of matrix forms on the substrate 112 are arranged.Each display unit 114 is all the multiple-level stack structure, includes transparency conducting layer 116, hole injection layer 118, hole transport layer 120, organic luminous layer 122, electron transfer layer 124 and conductive layer 126 and is stacked in regular turn on the substrate 112.And the process that is adopted can be magnetic control sputtering plating method (magenetically sputtering method), ion vapour deposition method (ion plating method), arc ions vapour deposition method (arc ion plating method) or plasma auxiliary chemical vapor deposition (PECVD) preparation etc.
In preferred embodiment of the present invention, substrate 112 is transparency carriers, glass substrate for example, transparency conducting layer 116 materials are selected from tin indium oxide (indium-tin oxide, ITO), indium oxide (indiumoxide), zinc oxide (zinc oxide), zinc-tin oxide (zinc-tin oxide) or constitute one of them of group, hole injection layer 118 is then by 4,4 ', 4 " three (nitrogen-2-naphthyl-nitrogen-phenylamino) triphenylamine layer constitutes; and utilize the mode of sputter simultaneously; make be doped with in the 2T-NATA layer 1 to 20% 5; 6; 11; 12-tetraphenyl-aphthacene or derivatives thereof, hole transport layer 120 is to include N, N '-two-naphthyl-two-phenyl-benzidine (N, N '-Di (naphthalene-1-yl)-N, N '-diphenyl-benzidine, NPB), organic luminous layer 122 is to include three-(8-hydroxyl) quinoline aluminums (Tris-(8-hydroxy) quinoline alumium, Alq) and 4-(dicyano the methylene)-2-tert-butyl group-6-[(1,1,7,7)-the tetramethyl julolidine groups]-4 hydrogen-pyrans (4-(dicyanomethylene)-2-t-butyl-6-[(1,1,7,7)-tetramethyljulolidyl]-4H-pyran, DCJTB), electron transfer layer 124 be by three-(8-hydroxyl) quinoline aluminums (Tris-(8-hydroxy) quinoline alumium, Alq) layer constitutes, and the material of conductive layer 126 is to be selected from lithium, magnesium, calcium, strontium or constitute one of them of group.
As previously mentioned, wherein transparency conducting layer 116 is used as anode and negative electrode respectively with conductive layer 126, and be electrically connected on power supply 117, and generate hole and electronics respectively with both sides up and down in organic luminous layer 122, make organic luminous layer 122 carry out active illuminating by the combination in electronics and hole again.And the function of hole injection layer 118, hole transport layer 120 and electron transfer layer 124 etc. is generation and transmission in order to assist hole or electronics, with the driving voltage of reduction organic light emitting display, and further improves display quality.In addition, above-mentioned hole transport layer 120 or electron transfer layer 124 are all selectivity design (optional), can be omitted by the material of suitably choosing all the other each layers, with further simplification technology.
Organic electroluminescence display panel 110 of the present invention is to utilize the main material of 2T-NATA layer as hole injection layer 118, and in 2T-NATA leads, be doped with part rubrene significantly to improve its component life, make organic electroluminescence display panel 110 of the present invention improve display quality keeping under the situation in useful life.Please refer to Fig. 3 to Fig. 6, Fig. 3 to Fig. 6 is respectively current density versus voltage graph of a relation (J-V curve), luminance against voltage graph of a relation (B-V curve), the luminous efficiency of organic electroluminescence display panel A, B and C to scheme voltage relationship figure (E-V curve) and component life test (lifetime test).In organic electroluminescence display panel A, B and C, except hole injection layer is wherein formed the material difference, the structure of all the other each layers is all identical, wherein the hole injection layer of organic electroluminescence display panel A and B is made of CuPc layer and 2T-NATA layer respectively, the hole injection layer of organic electroluminescence display panel C then is according to the foregoing description, constitutes with the 2T-NATA layer that is doped with rubrene.
Extremely shown in Figure 6 as Fig. 3, we can clearly find if (organic electroluminescence display panel B and C) can significantly improve the luminous efficiency of display floater when changing by the 2T-NATA layer as hole injection layer, but if only use the next word (organic electroluminescence display panel B) of 2T-NATA layer as hole injection layer, its component life will be on duty mutually, as shown in Figure 6, in testing time, with the breaking-up ratio that has above half, so lack practicality less than 50hr.Yet behind the rubrene that mixed (organic electroluminescence display panel C), not only can further increase the luminous efficiency of display floater, significantly be promoted to approximate degree its useful life especially, and can have the value on the industry with organic electroluminescence display panel A (using CuPc) as hole injection layer.
Compare with employed CuPc layer in the known technology, in the organic electroluminescence display panel of the present invention with the 2T-NATA layer that is doped with rubrene as hole injection layer, so have with the advantage of 2T-NATA layer as hole injection layer, and has better display quality, and significantly improve component life by the doping of rubrene, overcome too short problem of 2T-NATA layer elements life-span, therefore can improve luminous efficiency taking into account under the situation of component life, with the display quality of further raising display floater.
The above only is preferred embodiment of the present invention, and all equal variation and modifications of doing according to claim of the present invention all should belong to the protection range of patent of the present invention.
Claims (19)
1. organic electroluminescence display panel, it includes:
Substrate; And
Be located at this suprabasil a plurality of display units, and respectively this display unit includes:
Be located at this suprabasil transparency conducting layer;
Be located at the hole injection layer on this transparency conducting layer, and this hole injection layer is by being doped with 5,6,11,4,4 of 12-tetraphenyl-aphthacene or derivatives thereof ', 4 " three (nitrogen-2-naphthyl-nitrogen-phenylamino) triphenylamine layer constitutes;
Be located at the hole transport layer on this hole injection layer;
Be located at the organic luminous layer on this hole transport layer; And
Be located at the conductive layer on this organic luminous layer.
2. the organic electroluminescence display panel described in claim 1, wherein this hole injection layer be doped with 1 to 20% 5,6,11,12-tetraphenyl-aphthacene or derivatives thereof.
3. the organic electroluminescence display panel described in claim 1, wherein the material of this transparency conducting layer be selected from tin indium oxide, indium oxide, zinc oxide, zinc-tin oxide or constitute one of them of group.
4. the organic electroluminescence display panel described in claim 1, wherein this hole transport layer includes N, N '-two-naphthyl-two-phenyl-benzidine.
5. the organic electroluminescence display panel described in claim 1, wherein this organic luminous layer includes three-(8-hydroxyl) quinoline aluminum and 4-(dicyano the methylene)-2-tert-butyl group-6-[(1,1,7,7)-the tetramethyl julolidine groups]-4 hydrogen-pyrans.
6. the organic electroluminescence display panel described in claim 1, wherein this organic electroluminescence display panel also includes the electron transfer layer that is arranged between this organic luminous layer and this conductive layer.
7. the organic electroluminescence display panel described in claim 1, wherein this electron transfer layer is made of three-(8-hydroxyl) quinoline aluminium laminations.
8. the organic electroluminescence display panel described in claim 1, wherein the material of this conductive layer be selected from lithium, magnesium, calcium, strontium or constitute one of them of group.
9. the organic electroluminescence display panel described in claim 1, wherein this organic electroluminescence display panel also includes the protective layer of being located at this conductive layer top.
10. the organic electroluminescence display panel described in claim 9, wherein the material of this protective layer be selected from aluminium, indium, copper, gold, silver or constitute one of them of group.
11. an organic electroluminescence display panel, it includes:
Substrate; And
Be located at this suprabasil a plurality of display units, and respectively this display unit includes:
Be located at this suprabasil transparency conducting layer;
Be located at the hole injection layer on this transparency conducting layer;
Be located at the hole transport layer on this hole injection layer;
Be located at the organic luminous layer on this hole transport layer;
Be arranged at the electron transfer layer on this organic luminous layer; And
Be located at the conductive layer on this electron transfer layer;
Wherein this hole injection layer be by 4,4 ', 4 " three (nitrogen-2-naphthyl-nitrogen-phenylamino) triphenylamine layer constitutes, and is doped with 5,6,11, and 12-tetraphenyl-aphthacene or derivatives thereof is to prolong the useful life of this organic electroluminescence display panel.
12. the organic electroluminescence display panel described in claim 11, wherein this hole injection layer be doped with 1 to 20% 5,6,11,12-tetraphenyl-aphthacene or derivatives thereof.
13. the organic electroluminescence display panel described in claim 11, wherein the material of this transparency conducting layer be selected from tin indium oxide, indium oxide, zinc oxide, zinc-tin oxide or constitute one of them of group.
14. the organic electroluminescence display panel described in claim 11, wherein this hole transport layer includes N, N '-two-naphthyl-two-phenyl-benzidine.
15. the organic electroluminescence display panel described in claim 11, wherein this organic luminous layer includes three-(8-hydroxyl) quinoline aluminum and 4-(dicyano the methylene)-2-tert-butyl group-6-[(1,1,7,7)-the tetramethyl julolidine groups]-4 hydrogen-pyrans.
16. the organic electroluminescence display panel described in claim 11, wherein this electron transfer layer is made of one three-(8-hydroxyl) quinoline aluminium laminations.
17. the organic electroluminescence display panel described in claim 11, wherein the material of this conductive layer be selected from lithium, magnesium, calcium, strontium or constitute one of them of group.
18. the organic electroluminescence display panel described in claim 11, wherein this organic electroluminescence display panel also includes the protective layer of being located at this conductive layer top.
19. the organic electroluminescence display panel described in claim 18, wherein the material of this protective layer be selected from aluminium, indium, copper, gold, silver or constitute one of them of group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031015743A CN100355081C (en) | 2003-01-15 | 2003-01-15 | Organic luminous display panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031015743A CN100355081C (en) | 2003-01-15 | 2003-01-15 | Organic luminous display panel |
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| Publication Number | Publication Date |
|---|---|
| CN1518400A true CN1518400A (en) | 2004-08-04 |
| CN100355081C CN100355081C (en) | 2007-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031015743A Expired - Lifetime CN100355081C (en) | 2003-01-15 | 2003-01-15 | Organic luminous display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5773929A (en) * | 1996-06-24 | 1998-06-30 | Motorola, Inc. | Organic EL device with dual doping layers |
| JP3852518B2 (en) * | 1998-05-18 | 2006-11-29 | ソニー株式会社 | Organic electroluminescence device |
| EP1107331A3 (en) * | 1999-12-09 | 2005-11-02 | Daicel Chemical Industries, Ltd. | Material for organic electroluminescence device and process for producing the same |
| US6579629B1 (en) * | 2000-08-11 | 2003-06-17 | Eastman Kodak Company | Cathode layer in organic light-emitting diode devices |
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| CN100355081C (en) | 2007-12-12 |
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Granted publication date: 20071212 |