CN100422285C - Luminescent layer of organic electroluminescent device and organic electroluminescent materials - Google Patents
Luminescent layer of organic electroluminescent device and organic electroluminescent materials Download PDFInfo
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- CN100422285C CN100422285C CNB2006100732700A CN200610073270A CN100422285C CN 100422285 C CN100422285 C CN 100422285C CN B2006100732700 A CNB2006100732700 A CN B2006100732700A CN 200610073270 A CN200610073270 A CN 200610073270A CN 100422285 C CN100422285 C CN 100422285C
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Abstract
The present invention relates to a luminous layer of an organic electroluminescent device, which is composed of a main luminous body and a coping substance, wherein the doping substance is mixed in the main luminous body, and the chemical constitution of the doping substance can be shown from a chemical formula I to a chemical formula VI.
Description
Technical field
The present invention relates to a kind of organic electroluminescence device, particularly relate to a kind of luminescent layer and electroluminescent organic material thereof of organic electroluminescence device.
Background technology
In recent years, in the industry of flat-panel screens, display of organic electroluminescence (Organic LightEmitting Diode Display; OLED Display), and attracted attention gradually because of having self-luminosity, high brightness, super wide viewing angle, high speed of response, low driving voltage and advantage such as in light weight.But electroluminescent display is arranged, and the occupation rate on market is still limited at present, therefore, each big indicating meter is made factory and all is devoted to look for best manufacture method, produces yield and product performance to improve, and expectation can impel electroluminescent display early in popularizing on the market.
Display of organic electroluminescence is a kind of flat-panel screens of emissive type, its light source is to change by the organic light-emitting diode pixel electric current from itself, so, see through the thin film transistor that couples again and define different GTG brightness by adjusting the maximum brightness that this electric current just can determine panel.
Conventional full-colorization of display of organic electroluminescence technology limits red bluish-green trichromatic position for the mode via metallic shield.Also have a kind of mode that does not need metallic shield in addition, it filters white light organic electroluminescent device (White Organic Light Emitting Diode for utilizing colored filter; WOLED) white light that is sent, and by penetrating the photochromic purpose that reaches full-colorization of colored filter.
In general, the white light that WOLED sent of routine system is mixed by the light of different wave length.Such white light is through after the colored filter, and the light of specific wavelength can be absorbed by the photoresistance on the colored filter, will form monochromatic ray and remain unabsorbed light.Yet the photoresistance of the green filter disc of general colored filter has too big sphere of penetration, allows the tangerine light of wavelength about 600nm also with the penetration green filter disc.And the white light that general WOLED is sent at the crest of red light portion between 580nm～600nm, therefore the green filter disc that penetrates colored filter near the ruddiness about half will be arranged, and make display of organic electroluminescence all seem not enough at the display efficiency and the colorimetric purity of green glow part.
Summary of the invention
Therefore one aspect of the present invention is providing a kind of electroluminescent organic material exactly, and it can be applicable on the WOLED, makes WOLED launch and has the white light of suitable luminescent spectrum, and then allow the green glow that penetrates behind the colored filter have better colorimetric purity.
According to a preferred embodiment of the invention, propose a kind of electroluminescent organic material, the light intensity of its luminescent spectrum below wavelength 588nm is less than the light intensity of 20% spectrum crest.Generally speaking, the sphere of penetration of the green filter disc of colored filter is between about 480nm-600nn, so when the light intensity of luminescent spectrum below wavelength 588nm of organic electroluminescent material is minimum with respect to crest, can avoid the tangerine light of wavelength below 588nm to penetrate the green filter disc of colored filter effectively.
More particularly, the covering scope of the luminescent spectrum of this electroluminescent organic material is 560nm～750nm.In other words, electroluminescent organic material according to present embodiment is a kind of red light-emitting material, be combined into WOLED if use this electroluminescent organic material and green light luminescent material and blue light emitting material, have the white light of suitable luminescent spectrum with making WOLED launch, and then allow the green glow that penetrates behind the colored filter have better colorimetric purity.
In addition, according to the luminescent spectrum of the electroluminescent organic material of present embodiment, its crest is between 620nm-750nm.That is to say, use electroluminescent organic material of the present invention the white light that WOLED sends will be promoted at 580nm～600nm further at the crest of red light portion, so can avoid in routine techniques tangerine light to penetrate the problem of the green filter disc of colored filter.
The present invention is providing a kind of electroluminescent organic material on the other hand exactly, it can be applicable on the WOLED, make white light that WOLED sent promote at 580nm～600nm further, so can avoid in routine techniques tangerine light to penetrate the problem of the green filter disc of colored filter at the crest of red light portion.
According to another preferred embodiment of the invention, propose a kind of electroluminescent organic material, the crest of its luminescent spectrum is between 620nm-750nm.That is to say, use electroluminescent organic material of the present invention the white light that WOLED sends will be promoted at 580nm～600nm further at the crest of red light portion, so can avoid in routine techniques tangerine light to penetrate the problem of the green filter disc of colored filter.
In addition, according to the electroluminescent organic material that present embodiment proposed, the light intensity of its luminescent spectrum below wavelength 588nm is less than the light intensity of 20% spectrum crest.Generally speaking, the sphere of penetration of the green filter disc of colored filter is between about 480nm-600nm, so when the light intensity of luminescent spectrum below wavelength 588nm of organic electroluminescent material is minimum with respect to crest, can avoid the tangerine light of wavelength below 588nm to penetrate the green filter disc of colored filter effectively.
Further aspect of the present invention is exactly that a kind of luminescent layer of organic electroluminescence device is being provided, it can launch the visible light with suitable luminescent spectrum, makes that the display of organic electroluminescence of using this organic electroluminescence device can the higher green glow of display color saturation ratio.
According to a preferred embodiment more of the present invention, a kind of luminescent layer of organic electroluminescence device is proposed, it is made up of host emitter and hotchpotch.Wherein, hotchpotch is doped in the host emitter, and the chemical structure of hotchpotch can be:
The Formula I Formulae II
Formulae II I Formula I V
Chemical formula V chemical formula VI
In addition, above-mentioned hotchpotch can weight percent concentration 6%～15% be doped in the host emitter.So can allow organic electroluminescence device launch visible light, make that the display of organic electroluminescence of using this organic electroluminescence device can the higher green glow of display color saturation ratio with suitable luminescent spectrum.
More particularly, the light intensity of the luminescent spectrum of above-mentioned emission layer below wavelength 588nm is less than the light intensity of 20% spectrum crest.Generally speaking, the sphere of penetration of the green filter disc of colored filter is between about 480nm-600nm, so when the light intensity of luminescent spectrum below wavelength 588nm of emission layer is minimum with respect to crest, can avoid the tangerine light of wavelength below 588nm to penetrate the green filter disc of colored filter effectively.
In addition, according to the luminescent spectrum of the luminescent layer of present embodiment, its covering scope is 560nm～750nm.In other words, this luminescent layer is a kind of red light luminescent layer, if this luminescent layer and green light luminescent material and blue light emitting material are combined into WOLED, have the white light of suitable luminescent spectrum with making WOLED launch, and then allow the green glow that penetrates behind the colored filter have better colorimetric purity.
In addition, the luminescent layer that is proposed in the present embodiment, the crest of its luminescent spectrum is between 620nm-750nm.That is to say, use the white light that the luminescent layer of present embodiment can make WOLED send and promote at 580nm～600nm further, so can avoid in routine techniques tangerine light to penetrate the problem of the green filter disc of colored filter at the crest of red light portion.
Therefore, use the luminescent layer and the electroluminescent organic material thereof of organic electroluminescence device disclosed in this invention, can effectively solve conventional display of organic electroluminescence and show display efficiency and the insufficient problem of colorimetric purity on the green glow.
Description of drawings
For above and other objects of the present invention, feature, advantage and embodiment can be become apparent, appended graphic being described in detail as follows:
Fig. 1 is a kind of luminescent spectrum figure that illustrates according to the electroluminescent organic material of a preferred embodiment of the invention.
Fig. 2 is the synoptic diagram that illustrates according to the luminescent layer of the organic electroluminescence device of another preferred embodiment of the present invention.
Fig. 3 is a kind of luminescent spectrum figure that illustrates according to the blue light emitting material of an example of the present invention.
Fig. 4 is a kind of luminescent spectrum figure that illustrates according to the green light luminescent material of an example of the present invention.
Fig. 5 is a kind of luminescent spectrum figure that illustrates according to the WOLED of an example of the present invention.
The main devices nomenclature
110: crest
200: luminescent layer
210: host emitter
220: hotchpotch
Embodiment
In order to make the luminescent layer and the electroluminescent organic material thereof of organic electroluminescence device provided by the present invention clearer, below will and describe the clear spirit of the present invention of describing in detail with icon, those skilled in the art are after understanding the preferred embodiments of the present invention, can be by the technology that the present invention instructed, change and modification, it does not break away from spirit of the present invention and scope.
With reference to Fig. 1, it illustrates a kind of luminescent spectrum figure according to the electroluminescent organic material of a preferred embodiment of the invention.As shown in Figure 1, in the present embodiment, propose a kind of electroluminescent organic material, the light intensity of its luminescent spectrum below wavelength 588nm is less than the light intensity of 20% spectrum crest 110.Generally speaking, the sphere of penetration of the green filter disc of colored filter is between about 480nm-600nm, so when the light intensity of luminescent spectrum below wavelength 588nm of organic electroluminescent material is minimum with respect to crest, can avoid the tangerine light of wavelength below 588nm to penetrate the green filter disc of colored filter effectively.
Continuation is with reference to Fig. 1, and the covering scope of the luminescent spectrum of this electroluminescent organic material is 560nm～750nm.In other words, electroluminescent organic material according to present embodiment is a kind of red light-emitting material, be combined into WOLED if use this electroluminescent organic material and green light luminescent material and blue light emitting material, have the white light of suitable luminescent spectrum with making WOLED launch, and then allow the green glow that penetrates behind the colored filter have better colorimetric purity.
In addition, the electroluminescent organic material of present embodiment, the crest of its luminescent spectrum is between 620nm-750nm.That is to say, use electroluminescent organic material of the present invention the white light that WOLED sends will be promoted at 580nm～600nm further at the crest of red light portion, so can avoid in routine techniques tangerine light to penetrate the problem of the green filter disc of colored filter.
With reference to Fig. 2, it illustrates the synoptic diagram according to the luminescent layer of the organic electroluminescence device of another preferred embodiment of the present invention.Merit attention to such an extent that be, for convenience of description for the purpose of, Fig. 2 does not draw according to substantial proportion.In the present embodiment, propose a kind of luminescent layer 200 of organic electroluminescence device, it is by being made up of host emitter 210 and hotchpotch 220.Wherein, hotchpotch is doped in the host emitter, and the chemical structure of hotchpotch can be:
The Formula I Formulae II
Formulae II I Formula I V
Chemical formula V chemical formula VI
Wherein, the hotchpotch of each chemical formulation can be referring to as follows: Formula I: Adachi, M.A.Baldo, S.R.Forrest, S.Lamansky, M.E.Thompson, R.C.Kwong, Apply.Phys.Lett., 78,1662 (2001); Formulae II: Y.J.Su, H.L.Huang, C.L.Li, C.H.Chien, Y.T.Tao, P.T.Chou, S.Datta, R.S.Liu, Adv.Mater., 15,884 (2003); Formulae II I:US2003/0072964A1; Formula I V:J.P.Duan, P.P.Sun, C.H.Cheng, Adv, Mater., 15,224 (2003); Chemical formula V:C.H.Yang, C.C.Tai, I.W.Sun, J.ater.Chem., 14,947 (2004); Chemical formula VI:US2003/0072964A1.
In addition, above-mentioned hotchpotch can weight percent concentration 6%～15% be doped in the host emitter.So can allow organic electroluminescence device launch visible light, make that the display of organic electroluminescence of using this organic electroluminescence device can the higher green glow of display color saturation ratio with suitable luminescent spectrum.
In addition, according to the luminescent spectrum of the luminescent layer of present embodiment, its covering scope is 560nm～750nm.In other words, this luminescent layer is a kind of red light luminescent layer, if this luminescent layer and green light luminescent material and blue light emitting material are combined into WOLED, have the white light of suitable luminescent spectrum with making WOLED launch, and then allow the green glow that penetrates behind the colored filter have better colorimetric purity.
The luminescent layer that is proposed in the present embodiment, the crest of its luminescent spectrum is between 620nm-750nm.That is to say, use the white light that the luminescent layer of present embodiment can make WOLED send and promote at 580nm～600nm further, so can avoid in routine techniques tangerine light to penetrate the problem of the green filter disc of colored filter at the crest of red light portion.
Below the display effect of the display of organic electroluminescence that comes out according to the preferred embodiments of the present invention manufacturing will be described with limiting examples of the present invention.The conventional colored filter of employed colored filter system in the display of organic electroluminescence of this example, the sphere of penetration of its green filter disc is about 580nm-620nm.After using the conventional white light that WOLED sent and penetrating this colored filter, the hue coordinate CIE value of the shown white light that goes out red bluish-green three kinds of coloured light and composition thereof is as shown in table 1:
Table 1: the hue coordinate of the white light that conventional WOLED sent behind colored filter
| CIEx | CIEy | |
| White light | 0.312 | 0.339 |
| Ruddiness | 0.632 | 0.354 |
| Green glow | 0.290 | 0.513 |
| Blue light | 0.136 | 0.124 |
As shown in Table 1, after using white light that conventional WOLED sends and penetrating colored filter, shown green glow is not good in the performance of colorimetric purity.Its reason is that the photoresistance of the green filter disc of colored filter has too big sphere of penetration, allows the tangerine light of wavelength about 600nm also with the penetration green filter disc.
In this example, will form by red light-emitting material disclosed in this invention and blue light emitting material and green light luminescent material in the WOLED part.Wherein, the luminescent spectrum of red light-emitting material as shown in Figure 1, the luminescent spectrum of blue light emitting material as shown in Figure 3, the luminescent spectrum of green light luminescent material is then as shown in Figure 4.Use the WOLED that above-mentioned red light-emitting material, blue light emitting material and green light luminescent material are formed, its luminescent spectrum as shown in Figure 5.Merit attention to such an extent that be, the white light that this WLOED launched is positioned at about 625nm at the crest of red light portion, the WOLED height of this numeric ratio routine.After the white light that WOLED launched of this example penetrated colored filter, the hue coordinate CIE value of the shown white light that goes out red bluish-green three kinds of coloured light and composition thereof was as shown in table 2:
Table 2: the hue coordinate of the white light that WOLED sent behind colored filter of this example
| CIEx | CIEy | |
| White light | 0.312 | 0.339 |
| Ruddiness | 0.644 | 0.318 |
| Green glow | 0.267 | 0.604 |
| Blue light | 0.113 | 0.226 |
As shown in Table 2, after the white light that WOLED sent of using this example penetrated colored filter, shown green glow was better than the WOLED of routine really in the performance of colorimetric purity.
In sum, use the luminescent layer and the electroluminescent organic material thereof of organic electroluminescence device disclosed in this invention, can effectively solve conventional display of organic electroluminescence and show display efficiency and the insufficient problem of colorimetric purity on the green glow.
Though the present invention with preferred embodiment openly as above; yet it is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing various changes and modification, so protection scope of the present invention is as the criterion with appended claim scope.
Claims (8)
1. electroluminescent organic material is characterized in that:
The luminescent spectrum of this electroluminescent organic material below wavelength 588nm light intensity and the ratio of the light intensity of the crest of this luminescent spectrum at least less than 20%, and
This electroluminescent organic material comprises at least:
Host emitter; And
Hotchpotch is doped in this host emitter, and wherein this hotchpotch is the structure of Formula I, Formula I V or chemical formula V:
Formula I Formula I V
Chemical formula V.
2. electroluminescent organic material as claimed in claim 1, wherein the covering scope of this luminescent spectrum is 560nm～750nm.
3. electroluminescent organic material as claimed in claim 1, wherein the crest of this luminescent spectrum is between 620nm～750nm.
4. the luminescent layer of an organic electroluminescence device comprises at least:
Host emitter; And
Hotchpotch is doped in this host emitter, and wherein this hotchpotch is the structure of Formula I, Formula I V or chemical formula V:
Formula I Formula I V
Chemical formula V.
5. luminescent layer as claimed in claim 4, wherein this hotchpotch is doped in this host emitter with weight percent concentration 6～15%.
6. luminescent layer as claimed in claim 4, wherein the luminescent spectrum of this luminescent layer below wavelength 588nm light intensity and the ratio of the light intensity of the crest of this luminescent spectrum at least less than 20%.
7. luminescent layer as claimed in claim 6, wherein the covering scope of this luminescent spectrum is 560nm～750nm.
8. luminescent layer as claimed in claim 6, wherein the crest of this luminescent spectrum is between 620nm～750nm.
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| US20030072964A1 (en) * | 2001-10-17 | 2003-04-17 | Kwong Raymond C. | Phosphorescent compounds and devices comprising the same |
| CN1449640A (en) * | 2000-06-30 | 2003-10-15 | 纳幕尔杜邦公司 | Electroluminescent iridium compounds with fluorinated phenylpyridines, phenylpyrimidines, and phenylquinolines and devices made with such |
| US20040086743A1 (en) * | 2002-11-06 | 2004-05-06 | Brown Cory S. | Organometallic compounds for use in electroluminescent devices |
| US20050027123A1 (en) * | 2001-03-14 | 2005-02-03 | Canon Kabushiki Kaisha | Metal coordination compound, luminescence device and display apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449640A (en) * | 2000-06-30 | 2003-10-15 | 纳幕尔杜邦公司 | Electroluminescent iridium compounds with fluorinated phenylpyridines, phenylpyrimidines, and phenylquinolines and devices made with such |
| US20050027123A1 (en) * | 2001-03-14 | 2005-02-03 | Canon Kabushiki Kaisha | Metal coordination compound, luminescence device and display apparatus |
| US6869694B2 (en) * | 2001-03-14 | 2005-03-22 | Canon Kabushiki Kaisha | Metal coordination compound, luminescence device and display apparatus |
| US20030072964A1 (en) * | 2001-10-17 | 2003-04-17 | Kwong Raymond C. | Phosphorescent compounds and devices comprising the same |
| US20040086743A1 (en) * | 2002-11-06 | 2004-05-06 | Brown Cory S. | Organometallic compounds for use in electroluminescent devices |
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