CN100369287C - Organic electroluminescence assembly and manufacturing method thereof - Google Patents
Organic electroluminescence assembly and manufacturing method thereof Download PDFInfo
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- CN100369287C CN100369287C CNB2003101132033A CN200310113203A CN100369287C CN 100369287 C CN100369287 C CN 100369287C CN B2003101132033 A CNB2003101132033 A CN B2003101132033A CN 200310113203 A CN200310113203 A CN 200310113203A CN 100369287 C CN100369287 C CN 100369287C
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- 238000005401 electroluminescence Methods 0.000 title description 3
- 238000000034 method Methods 0.000 claims description 24
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Images
Abstract
The present invention discloses an organic electroluminescent assembly which is mainly composed of a base board, an anode, a blue luminous layer and a cathode, wherein the organic electroluminescent element anode is arranged on the base board, the blue luminous layer is arranged on the anode, and the cathode is arranged on the blue luminous layer; the blue luminous layer is mainly composed of a main luminous body, a first dopant and a second dopant, and the first dopant and the second dopant are arranged in the main luminous body. Because the first dopant enables the blue luminous layer to have excellent blue light color and brightness, and the second dopant enables the blue luminous layer to have a long service life, the organic electroluminescent assembly of the present invention has the advantages of excellent blue light color, high brightness and long service life.
Description
Technical field
The present invention relates to a kind of organic EL component (Organic Electroluminescentdevice, and be particularly related to a kind of organic EL component and manufacture method thereof of taking into account luminous efficiency (Luminous efficiency), life-span (Lifetime) and brightness (Brightness) simultaneously OEL device) and manufacture method.
Background technology
The information communication industry has become main flow industry now, and particularly portable various communication shows the emphasis that product develops especially, and flat-panel screens is behaved and the communication interface of information, and particular importance therefore seems.Present flat-panel screens mainly contains following several: organic electro-luminescent display (Organic Electro-Luminescent Display, OELD), plasma display (Plasma Display Panel, PDP), LCD (Liquid Crystal Display, LCD), light-emitting diode (Light Emitting Diode, LED), vacuum fluorescent display (Vacuum Fluorescent Display), field-emitter display (Field EmissionDisplay, FED) and electrochromics display (Electro-chromic Display) etc.Wherein, advantages such as organic electro-luminescent display is interdependent with its self-luminous, no visual angle, power saving, technology are simple and easy, low-cost, low operating temperature scope, high response speed and full-colorization and have great application potential are expected to become follow-on flat-panel screens main flow.
Organic electro-luminescent display is a kind of display module that utilizes the self luminous characteristic of luminous organic material to reach display effect.Its ray structure mainly is that (Emitting layer EMT) constitutes by pair of electrodes and luminescent layer.Between electric current is by anode and negative electrode, make electronics and electric hole in organic luminous layer in conjunction with and when producing exciton (Exciton), just can make luminescent layer according to its properties of materials, and produce the luminous of different colours, this is the principle of luminosity of organic EL component.For obtaining the organic EL component of high efficiency light-emitting characteristic, the most general method is that micromolecule organic electric-excitation luminescent material is made luminescent layer in vacuum evaporation mode (Vacuumevaporation).About being described as follows of organic EL component structure.
Fig. 1 is a kind of generalized section of organic EL component of known technology.Please refer to Fig. 1, known organic EL component 100 comprises a substrate 110, be configured in a anode 120 on the substrate 110, be configured in a luminescent layer 130 on the anode 120, be configured in the negative electrode 140 on the luminescent layer 130.In addition, above negative electrode 140, dispose a cover plate 160, so that organic EL component 100 packages are got up.
Wherein, if when desiring to make the organic EL component 100 of known technology to send blue light, luminescent layer 130 is made of a blue light-emitting layer 132.The blue light-emitting layer 132 of known technology is only arranged in pairs or groups with independent a kind of admixture (Dopant) owing to its host emitter (Host); and the blue light organic EL component is not good because of the arranging effect of host emitter and single admixture through regular meeting; and cause form (Morphology) stability of blue light-emitting layer 132 not good; not only can cause the decay (Decay) of blue light-emitting layer 132 itself; more can go wrong at the interface that contacts with blue light-emitting layer 132; cause the driving voltage of organic EL component 100 to rise, and then shorten assembly life-span.
In addition, if when desiring to make the organic EL component 100 of known technology to send white light, luminescent layer 130 is typically with a blue light-emitting layer 132 and a Chinese red luminescent layer 134 collocation and is constituted, and forms white light by its blue light and tangerine light that sends complementary colours (Complementary color) respectively.But as the above, not good with the arranging effect of independent a kind of admixture because of blue light-emitting layer 132, so the form of blue light-emitting layer 132 (Morphology) stability is not good.So when relaxation phenomenon took place blue light-emitting layer 130a, the white light that organic EL component 100 is sent promptly can produce colour cast (Chromatic aberration).
Summary of the invention
Purpose of the present invention is providing a kind of organic EL component and manufacture method thereof exactly, is suitable for using two kinds of admixtures by collocation in blue light-emitting layer, and makes organic EL component take into account luminous efficiency, life-span and brightness simultaneously.
Based on above-mentioned purpose, the present invention proposes a kind of organic EL component.This organic EL component mainly is made of a substrate, an anode, a blue light-emitting layer and a negative electrode.Wherein, anode arrangement is on substrate.Blue light-emitting layer is configured on the anode.Cathode arrangement is on luminescent layer.
And blue light-emitting layer mainly comprises a host emitter, one first admixture and one second admixture.First admixture and second admixture are doped in the host emitter, and the wavelength of the light that the collocation of this first admixture and this host emitter is sent is shorter than the arrange in pairs or groups wavelength of the light that sent of this second admixture and this host emitter.
In addition, the percentage by weight of first admixture in the blue light-emitting layer is for example greater than the percentage by weight of second admixture.The percentage by weight of first admixture is for example between 0.01%～50%, and maximum emission wavelength is for example between 400nm～470nm.The percentage by weight of second admixture is for example for being greater than or equal to 0.01% and less than 50%, and maximum emission wavelength is for example between 420nm～490nm.
In addition, the absorbing wavelength of second admixture for example is shorter than the emission wavelength of first admixture.First admixture for example has amino substituent diphenylethyllene aryl ether (Amino substituteddistyrylarylene).Second admixture is perylene compound (Perylene compound) for example.
In addition, the organic EL component of present embodiment for example also comprises a Chinese red luminescent layer, is configured between anode and the blue light-emitting layer, also or be configured between negative electrode and the blue light-emitting layer.
Based on above-mentioned purpose, the present invention proposes a kind of manufacture method of organic EL component.The manufacture method of this organic EL component mainly at first forms an anode on a substrate.Then on anode, form a blue light-emitting layer.On blue light-emitting layer, form a negative electrode afterwards.
And blue light-emitting layer mainly comprises a host emitter, one first admixture and one second admixture.First admixture and second admixture system is doped in the host emitter, and the wavelength of the light that this first admixture and the collocation of this host emitter are sent is shorter than the arrange in pairs or groups wavelength of the light that sent of this second admixture and this host emitter.
In addition, the percentage by weight of first admixture in the blue light-emitting layer is for example greater than the percentage by weight of second admixture.The percentage by weight of first admixture is for example between 0.01%～50%, and maximum emission wavelength is for example between 400nm～470nm.The percentage by weight of second admixture is for example for being greater than or equal to 0.01% and less than 50%, and maximum emission wavelength is for example between 420nm～490nm.
In addition, the absorbing wavelength of second admixture for example is shorter than the emission wavelength of first admixture.First admixture for example has amino substituent diphenylethyllene aryl ether (Amino substituteddistyrylarylene).Second admixture is perylene compound (Perylene compound) for example.
In addition, the manufacture method of organic EL component of the present invention for example also is included in and forms a Chinese red luminescent layer between anode and the blue light-emitting layer.Form a Chinese red luminescent layer also or between negative electrode and blue light-emitting layer.
In sum, organic EL component of the present invention and manufacture method thereof, because first admixture and second admixture have been used in collocation in the blue light-emitting layer, so the high blue light with use first admixture is photochromic and the advantage of high-luminous-efficiency, also has long-life advantage of using second admixture simultaneously.And, when sending white light, also can avoid the generating white light colour cast of being sent when more disposing the Chinese red luminescent layer in the organic EL component.
Description of drawings
Fig. 1 is a kind of generalized section of knowing organic EL component of known technology;
Fig. 2 is the generalized section of the organic EL component of first preferred embodiment of the present invention;
When Fig. 3 is to use single admixture and two kinds of admixtures in blue light-emitting layer, the driving voltage of organic EL component and time relation figure;
Fig. 4 A～4K is the structural formula of its host emitter of blue light-emitting layer, first admixture and second admixture of preferred embodiment of the present invention;
Fig. 5 A and Fig. 5 B are the generalized sections of the organic EL component of second preferred embodiment of the present invention.
100: organic EL component
110: substrate
120: anode
130: blue light-emitting layer
140: negative electrode
160: cover plate
200,202: organic EL component
210: substrate
220: anode
230: blue light-emitting layer
232: host emitter
234: the first admixtures
236: the second admixtures
240: negative electrode
260: cover plate
272: electric hole implanted layer
274: electric hole transport layer
276: electron transfer layer
278: electron injecting layer
280: the Chinese red luminescent layer
Embodiment
First embodiment
Fig. 2 is the generalized section of the organic EL component of first preferred embodiment of the present invention, and it is a kind of blue light organic EL component.Please refer to Fig. 2, organic EL component 200 mainly is made of a substrate 210, an anode 220, a blue light-emitting layer 230 and a negative electrode 240.Wherein, for example glass substrate, plastic base or bendable substrate (Flexible substrate) of substrate 210.Anode 220 is configured on the substrate 210.Because anode 220 is in order to the efficient injection blue light-emitting layer 230 of Jiang Diandong, so the material of anode 220 is preferable with the material with higher working function.The material of anode 220 for example is indium tin oxide (ITO), tin oxide, gold, silver, platinum or copper etc.Luminescent layer 230 is configured on the anode 220.Negative electrode 240 is configured on the blue light-emitting layer 230, its objective is in order to the efficient injection blue light-emitting layer 230 of electronics.Negative electrode 240 for example is the individual layer conductive layer, and its material for example is the metallic aluminium of high power function or silver etc.Negative electrode 240 can also be double-deck conductive layer, and its material for example is lithium fluoride/aluminium, barium/aluminium, magnesium/silver etc.
Illustrate further, blue light-emitting layer 230 mainly comprises 236 of a host emitter 232, one first admixture 234 and one second admixtures.First admixture 234 and second admixture 236 are to be doped in the host emitter 232.
Wherein, the wavelength of the light that host emitter 232 and 234 collocation of first admixture are sent is shorter, and therefore (Color Filter CF) can obtain the photochromic and luminous efficiency of splendid blue light afterwards at the process colored filter.Though the blue light that host emitter 232 and the collocation of second admixture 236 are sent is lighter, but has long advantage of life-span, also the stable effect of material layer generation that can join to other and blue light material layer 230.
From the above, therefore organic EL component 200 its blue light-emitting layers 230 of the present invention can have advantages such as high-luminous-efficiency, long-life and high brightness concurrently because first admixture 234 and second admixture 236 have been used in collocation.Wherein, because first admixture 234 and second admixture 236 are used in collocation, even blue light-emitting layer 230 still can not decayed after long-time the use, therefore also can avoid organic EL component 200 required driving voltages to improve, its experimental result please refer to shown in Figure 3.
In addition, because the blue light that host emitter 232 and 236 collocation of second admixture are sent is lighter, photochromic for the blue light of avoiding influencing organic EL component 200, the weight percent of first admixture 234 in the blue light-emitting layer 230 is in this way greater than the percentage by weight of second admixture 236.The percentage by weight of first admixture 234 is good with 0.1%～10% for example between 0.01%～50% especially.The maximum emission wavelength of first admixture 234 is for example between 400nm～470nm.The percentage by weight of second admixture 236 for being greater than or equal to 0.01% and less than 50%, is good with 0.1%～10% especially for example.The maximum emission wavelength of second admixture 236 is for example between 420nm～490nm.
In addition, the absorbing wavelength of second admixture 236 for example is shorter than the emission wavelength of first admixture 234.So, the light energy that can avoid first admixture 234 to be sent is absorbed by second admixture 236, and then causes the luminous efficiency of organic EL component 200 to reduce.
At host emitter 232, the material aspect of first admixture 234 and second admixture 236, host emitter 232 can be 9, the 10-diaryl fears (9,10-diarylanthracene), shown in Fig. 4 A, Ar wherein, Ar ' is aryl (aryl), and R is a hydrogen, alkyl (alkyl), aryl, it for example is 9, the 10-diphenyl fear (9,10-diphenylanthracene, DPA), 9,10-two (2-yls) fears that (9,10-bis (2-naphthalenyl) anthracene is ADN) with 2-(1, the 1-dimethyl)-9,10-two (2-yls) fear (2-(and 1,1-dimethyl)-9,10-bis (2-naphthalenyl) anthracene, TBADN), in regular turn respectively shown in Fig. 4 B～4D.Host emitter 232 can also be the diphenylethyllene aryl ether (distyrylarylene, DSA), shown in Fig. 4 E, Ar wherein, Ar1, Ar2, Ar3, Ar4 is an aryl, and it for example is DPVBi and 9, and 10-is two, and [4-(2, the 2-diphenylacetylene) phenyl] fear (9,10-bis[4-(2,2-diphenylethenyl) phenyl] anthracene), in regular turn respectively shown in Fig. 4 F～4G.And, first admixture 234 for example have amino substituent diphenylethyllene aryl ether (Amino substituted distyrylarylene, DSA-amine), shown in Fig. 4 H, 4I.Second admixture is perylene compound (Perylene compound) for example, shown in Fig. 4 J, 4K.
In addition, organic EL component 200 for example also comprises a cover plate 260.Cover plate 260 for example is the top that covers negative electrode 240, in order to whole assembly package is got up.
In the present invention, the electric current that puts on organic EL component 200 is generally direct current, can also be pulse current or alternating current certainly.In addition, the illumination mode of organic EL component 200 can be to penetrate anode 220 and ejaculation light, or penetrate negative electrode 240 and ejaculation light.
Please continue with reference to Fig. 2, organic EL component 200 for example also comprises an electric hole implanted layer (Hole-Injecting Layer, HIL) 272, one electric hole transport layer (Hole-TransportingLayer, HTL) 274, one electron transfer layer (Electron-Transporting Layer, ETL) 276 and one electron injecting layer (Electron-Injecting Layer, EIL) 278.Wherein, electric hole implanted layer 272 for example is disposed between blue light-emitting layer 230 and the anode 220, and electric hole transport layer 274 for example is disposed between blue light-emitting layer 230 and the electric hole implanted layer 272.In addition, electron transfer layer 276 for example is disposed between blue light-emitting layer 230 and the negative electrode 240, and electron injecting layer 278 for example is disposed between negative electrode 240 and the electron transfer layer 276.
Referring again to Fig. 2, the manufacture method of the organic EL component 200 of first preferred embodiment of the present invention mainly is at first to form anode 220 on substrate 210.Then form blue light-emitting layer 230 on anode 220, its generation type for example is vapour deposition method (Evaporation) or rubbing method (Coating).Wherein, blue light-emitting layer 230 mainly comprises a host emitter 232, one first admixture 234 and one second admixture 236.First admixture 234 and second admixture 236 are to be doped in the host emitter 232.On blue light-emitting layer 230, form a negative electrode 240 afterwards.In addition, formation anode 220 for example is vapour deposition method or sputtering method (Sputtering) with the mode of negative electrode 240.
In addition, the manufacture method of organic EL component 200 of the present invention forms electric hole implanted layer 272 and electric hole transport layer 274 before for example also being included in and forming anode 220 backs and form blue light-emitting layer 230 in regular turn.Forming blue light-emitting layer 230 backs and forming negative electrode 240 precedents, form electron transfer layer 276 and electron injecting layer 278 in regular turn as also comprising.Wherein, electric hole implanted layer 272, electric hole transport layer 274, electron transfer layer 276 for example are method of spin coating (Spin coating) with the formation method of electron injecting layer 278.
Second embodiment
Fig. 5 A and Fig. 5 B are the generalized sections of the organic EL component of second preferred embodiment of the present invention.It is a kind of white light organic electroluminescence assembly.Please be simultaneously with reference to Fig. 5 A and Fig. 5 B, this organic EL component 202 mainly is also to be formed with a Chinese red luminescent layer 280 at the last layer of blue light-emitting layer 230 with the difference of the foregoing description blue light organic EL component, (shown in Fig. 5 A), or also be formed with a Chinese red luminescent layer 280 (shown in Fig. 5 B) at following one deck of blue light-emitting layer 230.All the organic EL component 200 with first preferred embodiment of the present invention is identical and remaining structure is with manufacture method, promptly repeats no more at this.At this,, more increased the range of application of organic EL component 202 because therefore the complementation of the tangerine light that blue light that the blue light-emitting layer 230 of organic EL component 202 is sent and Chinese red luminescent layer 280 are sent can send white light.And, organic EL component 202 its blue light-emitting layers 230 are because first admixture 234 and second admixture 236 have been used in collocation, therefore can have advantages such as high-luminous-efficiency, long-life and high brightness concurrently, the white light of also avoiding being sent produces colour cast because of blue light-emitting layer 230 decay easily.
In sum, organic EL component of the present invention is owing to be that collocation uses first admixture and second admixture in blue light-emitting layer, therefore not only has splendid blue light performance, also have simultaneously higher luminous efficiency and overall brightness, and the life-span of blue light-emitting layer is long than the organic EL component of known technology, therefore the light generation colour cast that can avoid the white light organic electroluminescence assembly to be sent.
Though the present invention is with preferred embodiment openly as above, it is not in order to qualification the present invention, any personnel that are familiar with this technology, and without departing from the spirit and scope of the present invention, a little change and the retouching done all belong to protection scope of the present invention.
Claims (18)
1. organic EL component is characterized in that: comprise at least:
One anode is configured on the substrate;
One negative electrode is configured in this anode top;
One blue light-emitting layer is configured between this anode and this negative electrode, and this blue light-emitting layer comprises at least:
One host emitter;
One first admixture is doped in this host emitter; And
One second admixture is doped in this host emitter, and the wavelength of the light that the collocation of this first admixture and this host emitter is sent is shorter than the arrange in pairs or groups wavelength of the light that sent of this second admixture and this host emitter.
2. organic EL component according to claim 1 is characterized in that: the percentage by weight of this first admixture in this blue light-emitting layer is greater than the percentage by weight of this second admixture.
3. organic EL component according to claim 2 is characterized in that: the percentage by weight of this first admixture in this blue light-emitting layer is between 0.01%～50%, and maximum emission wavelength is between 400nm～470nm.
4. organic EL component according to claim 2 is characterized in that: the percentage by weight of this second admixture in this blue light-emitting layer is for being greater than or equal to 0.01% and less than 50%, and maximum emission wavelength is between 420nm～490nm.
5. organic EL component according to claim 1 is characterized in that: the absorbing wavelength of this second admixture is shorter than the emission wavelength of this first admixture.
6. organic EL component according to claim 1 is characterized in that: this first admixture comprises having amino substituent diphenylethyllene aryl ether (Amino substituteddistyrylarylene).
7. organic EL component according to claim 1 is characterized in that: this second admixture comprises perylene compound (Perylene compound).
8. organic EL component according to claim 1 is characterized in that: also comprise a Chinese red luminescent layer, be configured between this anode and this blue light-emitting layer.
9. organic EL component according to claim 1 is characterized in that: also comprise a Chinese red luminescent layer, be configured between this negative electrode and this blue light-emitting layer.
10. the manufacture method of an organic EL component is characterized in that: comprise at least:
On a substrate, form an anode;
Form a blue light-emitting layer on this anode, wherein this blue light-emitting layer comprises at least:
One host emitter;
One first admixture is doped in this host emitter;
One second admixture is doped in this host emitter, and the wavelength of the light that the collocation of this first admixture and this host emitter is sent is shorter than the arrange in pairs or groups wavelength of the light that sent of this second admixture and this host emitter; And
On this blue light-emitting layer, form a negative electrode.
11. the manufacture method of organic EL component according to claim 10 is characterized in that: the percentage by weight of this first admixture in this blue light-emitting layer is greater than the percentage by weight of this second admixture.
12. the manufacture method of organic EL component according to claim 11 is characterized in that: the percentage by weight of this first admixture in this blue light-emitting layer is between 0.1%～10%, and maximum emission wavelength is between 400nm～470nm.
13. the manufacture method of organic EL component according to claim 11 is characterized in that: the percentage by weight of this second admixture in this blue light-emitting layer is between 0.1%～10%, and maximum emission wavelength is between 420nm～490nm.
14. the manufacture method of organic EL component according to claim 10 is characterized in that: the absorbing wavelength of this second admixture is shorter than the emission wavelength of this first admixture.
15. the manufacture method of organic EL component according to claim 10 is characterized in that: this first admixture comprises having amino substituent diphenylethyllene aryl ether (Aminosubstituted distyrylarylene).
16. the manufacture method of organic EL component according to claim 10 is characterized in that: this second admixture comprises perylene compound (Perylene compound).
17. the manufacture method of organic EL component according to claim 10 is characterized in that: also be included in and form a Chinese red luminescent layer between this anode and this blue light-emitting layer.
18. the manufacture method of organic EL component according to claim 10 is characterized in that: also be included in and form a Chinese red luminescent layer between this negative electrode and this blue light-emitting layer.
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| CN100421278C (en) * | 2005-06-02 | 2008-09-24 | 友达光电股份有限公司 | Organic LED luminous layer and organic LED display panel using same |
| KR101308282B1 (en) | 2005-09-05 | 2013-09-13 | 이데미쓰 고산 가부시키가이샤 | Blue light emitting organic electroluminescence element |
| US8525159B2 (en) * | 2009-09-11 | 2013-09-03 | Sharp Kabushiki Kaisha | Organic light emitting element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1346233A (en) * | 2000-06-08 | 2002-04-24 | 伊斯曼柯达公司 | Organic electroluminescence device with improved stability and effectivity |
| US20020067124A1 (en) * | 2000-11-29 | 2002-06-06 | Kafafi Zakya H. | Universal host for RG or RGB emission in organic light emitting devices |
| JP2003272857A (en) * | 2002-03-19 | 2003-09-26 | Idemitsu Kosan Co Ltd | White color group organic electroluminescent element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1346233A (en) * | 2000-06-08 | 2002-04-24 | 伊斯曼柯达公司 | Organic electroluminescence device with improved stability and effectivity |
| US20020067124A1 (en) * | 2000-11-29 | 2002-06-06 | Kafafi Zakya H. | Universal host for RG or RGB emission in organic light emitting devices |
| JP2003272857A (en) * | 2002-03-19 | 2003-09-26 | Idemitsu Kosan Co Ltd | White color group organic electroluminescent element |
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