CN102201545A - Organic light-emitting device - Google Patents
Organic light-emitting device Download PDFInfo
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- CN102201545A CN102201545A CN2011101270127A CN201110127012A CN102201545A CN 102201545 A CN102201545 A CN 102201545A CN 2011101270127 A CN2011101270127 A CN 2011101270127A CN 201110127012 A CN201110127012 A CN 201110127012A CN 102201545 A CN102201545 A CN 102201545A
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- organic light
- emitting device
- light emitting
- anode
- transparent substrate
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- 239000000758 substrate Substances 0.000 claims abstract description 29
- 238000000149 argon plasma sintering Methods 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000011159 matrix material Substances 0.000 claims abstract description 15
- 230000005525 hole transport Effects 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000002105 nanoparticle Substances 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims description 3
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 16
- 230000007547 defect Effects 0.000 description 5
- 239000003086 colorant Substances 0.000 description 4
- 238000005401 electroluminescence Methods 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
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- 230000005855 radiation Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Abstract
The invention provides an organic light-emitting device (OLED), which is characterized by comprising a transparent substrate, an anode, an organic light-emitting layer, a cathode and a light scattering film, wherein the anode is positioned on the transparent substrate; the organic light-emitting layer is positioned on the anode; the cathode is positioned on the organic light-emitting layer; the light scattering film is positioned below the transparent substrate and has the thickness of more than 100mu m; and scattering particles are doped in a matrix of the light scattering film and have the size of between 100 and 1,000nm, the weight ratio of the scattering particles to the matrix is between 0.05 and 10 percent, and refractive index of the scattering particles is different from that of the matrix. Due to the adoption of the light scattering film, incident light can be reflected repeatedly, and the probability of light scattering at different angles is improved, so that color differences of the OLED at different visual angles are reduced.
Description
Technical Field
The present invention relates to an organic light emitting device, and more particularly, to an organic light emitting device with little color difference between different viewing angles.
Background
The structure of an Organic light-emitting device (abbreviated as OLED) operates based on the principle of electroluminescence. The typical structure is that a layer of organic luminescent material with the thickness of dozens of nanometers is made on ITO glass to be used as a luminescent layer, and a layer of metal electrode with low work function is arranged above the luminescent layer. When a voltage is applied across the electrodes, the light-emitting layer generates light radiation. Unlike inorganic thin film electroluminescent devices (TFEL), electroluminescence of organic materials is an injection type of composite luminescence, which has a luminescence mechanism in which holes and electrons generated from an anode and a cathode are combined into excitons in a luminescent material, energy of the excitons is transferred to luminescent molecules, so that the electrons in the luminescent molecules are excited to an excited state, which is an unstable state, and visible light is generated by a deactivation process.
Organic Light Emitting Devices (OLEDs) have the advantages of being light, thin, high color, high contrast, and can be fabricated on flexible substrates, and can be used for lighting and display applications. However, the organic light emitting device (0LED) is an optical micro-resonant cavity structure, and the different wavelengths of the phase matching at different viewing angles cause the light output amount of the different wavelengths at different viewing angles to change, so that the light output color of the Organic Light Emitting Device (OLED) at different viewing angles changes, and thus the colors of the Organic Light Emitting Devices (OLED) at different viewing angles have a larger difference.
In view of the above, it is an urgent issue to be solved by those skilled in the art how to design a novel Organic Light Emitting Device (OLED) to reduce color differences at different viewing angles as much as possible.
Disclosure of Invention
Aiming at the defect that colors of different visual angles of an organic light-emitting device (OLED) have larger difference in the prior art, the invention provides a novel organic light-emitting device.
According to the present invention, there is provided an organic light emitting device comprising: transparent substrate, positive pole, organic luminescent layer, negative pole and light scattering membrane. Wherein the anode is positioned on the transparent substrate; the organic light-emitting layer is positioned on the anode; the cathode is positioned on the organic light-emitting layer; and the light scattering film is positioned below the transparent substrate and has a thickness of more than 100 mu m, scattering particles are doped in a matrix of the light scattering film, the size of the scattering particles is between 100 and 1000 nanometers, the weight ratio of the scattering particles to the matrix is between 0.05 and 10 percent, and the refractive indexes of the scattering particles and the matrix are different.
Preferably, the substrate is made of a silicone material.
Preferably, the scattering particles are different from the matrix material, including titanium oxide, zirconium oxide or silica nanoparticles.
Preferably, the anode is made of indium tin oxide.
Preferably, the cathode is made of at least one of magnesium, aluminum, silver or calcium.
Preferably, the organic light emitting device further comprises a hole transport layer between the anode and the organic light emitting layer.
Preferably, the organic light emitting device further comprises an electron transport layer between the cathode and the organic light emitting layer.
Preferably, the organic light emitting device further comprises a hole injection layer between the anode and the hole transport layer.
Preferably, the transparent substrate may be made of glass.
By adopting the organic light-emitting device (OLED) provided by the invention, incident light can be scattered for multiple times, and the probability of scattering light to different angles is increased, so that the difference of colors of different viewing angles of the organic light-emitting device (OLED) can be reduced.
Drawings
The various aspects of the present invention will become more apparent to the reader after reading the detailed description of the invention with reference to the attached drawings. Wherein,
FIG. 1 shows a schematic cross-sectional view of a prior art organic light emitting device without a light scattering film;
FIG. 2 shows a schematic cross-sectional view of a prior art organic light emitting device having a thin light scattering film;
fig. 3 shows a schematic cross-sectional view of an organic light emitting device according to the present invention.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic cross-sectional view of a prior art organic light emitting device without a light scattering film. Referring to fig. 1, the organic light emitting device 10 includes: a transparent substrate 100, an anode 110, a hole transport layer 120, an organic light emitting layer 130, an electron transport layer 140, and a cathode 150. The anode 110 is disposed on the transparent substrate 100, the hole transport layer 120 is disposed on the anode 110, the organic light emitting layer 130 is disposed on the hole transport layer 120, the electron transport layer 140 is disposed on the organic light emitting layer 130, and the cathode 150 is disposed above the electron transport layer 140. Under the bias condition, electrons from the cathode 150 recombine with holes from the anode 110 at the organic light emitting layer 130, causing the organic light emitting layer 130 to emit light.
As shown in fig. 1, since the light emitted from the organic light emitting layer 130 sequentially passes through the hole transporting layer 120, the anode 110 and the transparent substrate 100, since the matching wavelengths of the lights are different, when the light 101 enters the air from the transparent substrate 100, the refractive indexes are also different, which causes a great difference in the light emitting amount of different wavelengths at different viewing angles, so that the light emitting color of the organic light emitting device 10 at different viewing angles is greatly different.
Fig. 2 shows a schematic cross-sectional view of a related art organic light emitting device having a thin light scattering film. Referring to fig. 2, the organic light emitting device 20 includes: a transparent substrate 200, an anode 210, a hole transport layer 220, an organic light emitting layer 230, an electron transport layer 240, a cathode 250, and a light scattering film 260. Similar to fig. 1, the anode 210 is disposed on the transparent substrate 200, the hole transport layer 220 is disposed on the anode 210, the organic light emitting layer 230 is disposed on the hole transport layer 220, the electron transport layer 240 is disposed on the organic light emitting layer 230, and the cathode 250 is disposed on the electron transport layer 240. Also under bias conditions, electrons from the cathode 250 recombine with holes from the anode 210 at the organic light emitting layer 230, causing the organic light emitting layer 230 to emit light. Light emitted from the organic light emitting layer 230 passes through the hole transport layer 220, the anode 210, and the transparent substrate 200 in this order.
With reference to fig. 2, in order to improve the defect that the light emitting amount of different wavelengths of different viewing angles has different differences due to different matching wavelengths of various lights, so that the light emitting color of the organic light emitting device at different viewing angles is greatly different, the light scattering film 260 is attached below the transparent substrate 200, and the dispersed particles 262 are doped in the matrix 261 of the light scattering film 260, so that the light 201 emitted from the transparent substrate 200 can be scattered, the probability that the light 201 is scattered to different viewing angles is increased, and the aforementioned defect that the light color at different viewing angles is different can be slightly improved, but because the light scattering film 260 is relatively thin, the light 201 from the transparent substrate 200 has a relatively narrow viewing angle range after being scattered, so the light color difference at different viewing angles is still relatively large.
Fig. 3 shows a schematic cross-sectional view of an organic light emitting device according to the present invention. Referring to fig. 3, the organic light emitting device 30 includes: a transparent substrate 300, an anode 310, a hole transport layer 320, an organic light emitting layer 330, an electron transport layer 340, a cathode 350, and a light scattering film 360. In this embodiment, the transparent substrate 300 is made of glass, the anode 310 is an indium tin oxide layer, and the cathode 350 is made of a magnesium silver alloy.
Similar to fig. 2, the anode 310 is positioned on the transparent substrate 300, the hole transport layer 320 is positioned on the anode 310, the organic light emitting layer 330 is positioned on the hole transport layer 320, the electron transport layer 340 is positioned on the organic light emitting layer 330, and the cathode 350 is positioned on the electron transport layer 340. In other embodiments, a hole injection layer may be disposed between the anode 310 and the hole transport layer 320. Under bias conditions, electrons from the cathode 350 recombine with holes from the anode 310 at the organic light emitting layer 330, causing the organic light emitting layer 330 to emit light. Light emitted from the organic light emitting layer 330 passes through the hole transport layer 320, the anode 310, and the transparent substrate 300 in order.
In order to also improve the defect that the light emitting amount of different wavelengths at different viewing angles has a great difference due to different matching wavelengths of various lights, so that the light emitting color of the organic light emitting device at different viewing angles has a great difference, a light scattering film 360 is disposed below the transparent substrate 300, scattering particles 362 are doped in a matrix 361 of the light scattering film 360, the size of the scattering particles 362 is between 100 and 1000 nanometers, the weight ratio of the scattering particles 362 to the matrix 361 is between 0.05 and 10%, the matrix 361 is made of an organic silicon material, in this embodiment, the scattering particles 362 are titanium oxide nanoparticles, and in another embodiment, the scattering particles 362 may be zirconium oxide or silicon dioxide nanoparticles. The scattering particles 362 have a refractive index greater than or less than that of the matrix 361. The thickness of the light scattering film 360 is greater than 100 μm, and the light 301 from the transparent substrate 300 can be scattered multiple times because the light scattering film 360 is thicker, so that the probability of scattering the light 301 to different viewing angles can be increased, and the defect that the organic light emitting device has great difference in the light color of the emitted light at different viewing angles can be overcome.
The invention has the advantages that: the organic light-emitting device is provided with the thick light scattering film, so that light entering air can be scattered for multiple times, the chance of scattering the light to different angles is increased, and the difference of light colors of the organic light-emitting device at different viewing angles is reduced.
Hereinbefore, specific embodiments of the present invention are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present invention without departing from the spirit and scope of the invention. Such modifications and substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (9)
1. An organic light-emitting device, comprising:
a transparent substrate;
an anode on the transparent substrate;
an organic light emitting layer on the anode;
a cathode on the organic light emitting layer; and
and a light scattering film which is positioned below the transparent substrate and has a thickness of more than 100 μm, wherein scattering particles are doped in a matrix of the light scattering film, the size of the scattering particles is between 100 and 1000 nanometers, the weight ratio of the scattering particles to the matrix is between 0.05 and 10%, and the refractive index of the scattering particles is different from that of the matrix.
2. The organic light emitting device of claim 1, wherein the host is made of an organosilicon material.
3. The organic light emitting device of claim 1, wherein the scattering particles are different from the host material and comprise titanium oxide, zirconium oxide, or silica nanoparticles.
4. The organic light emitting device of claim 1, wherein the anode is made of indium tin oxide.
5. The organic light emitting device of claim 1, wherein the cathode is made of at least one of magnesium, aluminum, silver, or calcium.
6. The organic light emitting device of claim 1, further comprising a hole transport layer between the anode and the organic light emitting layer.
7. The organic light-emitting device of claim 1, further comprising an electron transport layer between the cathode and the organic light-emitting layer.
8. The organic light-emitting device of claim 6, further comprising a hole injection layer between the anode and the hole transport layer.
9. The organic light-emitting device of claim 1, wherein the transparent substrate is made of glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101270127A CN102201545A (en) | 2011-05-13 | 2011-05-13 | Organic light-emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101270127A CN102201545A (en) | 2011-05-13 | 2011-05-13 | Organic light-emitting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102201545A true CN102201545A (en) | 2011-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101270127A Pending CN102201545A (en) | 2011-05-13 | 2011-05-13 | Organic light-emitting device |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700689A (en) * | 2013-12-23 | 2014-04-02 | 京东方科技集团股份有限公司 | Flexible luminous display device as well as manufacturing method and application carrier thereof |
| CN104218154A (en) * | 2013-05-30 | 2014-12-17 | 海洋王照明科技股份有限公司 | Organic light emission diode device and fabrication method thereof |
| CN108474875A (en) * | 2015-09-23 | 2018-08-31 | 康宁公司 | Use the light extraction of the OLED of nanostructured coatings |
| CN108963106A (en) * | 2018-07-24 | 2018-12-07 | 云谷（固安）科技有限公司 | Display panel and preparation method thereof, display device |
-
2011
- 2011-05-13 CN CN2011101270127A patent/CN102201545A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218154A (en) * | 2013-05-30 | 2014-12-17 | 海洋王照明科技股份有限公司 | Organic light emission diode device and fabrication method thereof |
| CN103700689A (en) * | 2013-12-23 | 2014-04-02 | 京东方科技集团股份有限公司 | Flexible luminous display device as well as manufacturing method and application carrier thereof |
| CN108474875A (en) * | 2015-09-23 | 2018-08-31 | 康宁公司 | Use the light extraction of the OLED of nanostructured coatings |
| US11005075B2 (en) | 2015-09-23 | 2021-05-11 | Corning Incorporated | OLED light extraction using nanostructured coatings |
| CN108474875B (en) * | 2015-09-23 | 2022-02-11 | 康宁公司 | Light extraction of OLEDs using nanostructured coatings |
| CN108963106A (en) * | 2018-07-24 | 2018-12-07 | 云谷（固安）科技有限公司 | Display panel and preparation method thereof, display device |
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Application publication date: 20110928 |