CN109686853B - Color-adjustable organic electroluminescent device - Google Patents
Color-adjustable organic electroluminescent device Download PDFInfo
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- CN109686853B CN109686853B CN201811600579.XA CN201811600579A CN109686853B CN 109686853 B CN109686853 B CN 109686853B CN 201811600579 A CN201811600579 A CN 201811600579A CN 109686853 B CN109686853 B CN 109686853B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
- H10K50/131—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit with spacer layers between the electroluminescent layers
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- H—ELECTRICITY
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
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Abstract
The invention discloses a color-tunable organic electroluminescent device. The device sequentially comprises a glass substrate, an ITO film, a hole injection layer, a hole transport layer, a light emitting structure layer, an electron transport layer, an electron injection layer and a metal electrode from bottom to top; the light emitting structure layer sequentially comprises a yellow light emitting layer, a transition layer and a red light emitting layer from top to bottom; the yellow light emitting layer is prepared by mixing 8-hydroxyquinoline aluminum and 4- (dimercaptomethylene) -2-methyl-6- (p-dimethylamino styryl) -4H-pyran; the material of the transition layer is formed by mixing tri (4-carbazole-9-phenyl) amine and 8-hydroxyquinoline aluminum; the material of the red light emitting layer is formed by mixing tri (4-carbazole-9-yl phenyl) amine and (E) -4-dinitrile methylene-2-tert-butyl-6- (1,1,7, 7-tetramethyl julolidine vinyl) pyran. The color-adjustable organic electroluminescent device has the advantages of reducing the number of multicolor lamp sheets, saving the occupied space of the illuminating lamp and avoiding the loss of partial red light at the tail part of the automobile.
Description
Technical Field
The invention relates to the technical field of organic electroluminescent devices, in particular to a color-adjustable organic electroluminescent device.
Background
With the development of science and technology, the technology of automobile light sources is undergoing revolution, and the OLED gradually becomes the first choice for the automobile lamp of high-end automobile type. The automobile tail lamp needs large-area red light, and meanwhile, a yellow steering indicating lamp is also needed. At present, when the automobile tail lamp emits red light and yellow light, a part of yellow-light OLED lamp pieces need to be added into large-area red light, and thus, the automobile tail lamp can have partial red light loss in the process of using the automobile red tail lamp.
Disclosure of Invention
The invention aims to provide a color-adjustable organic electroluminescent device which has the advantages of reducing the number of multicolor lamp pieces, saving the occupied space of an illuminating lamp and avoiding the defect of partial red light at the tail part of an automobile.
In order to achieve the purpose, the invention provides the following scheme:
a color tunable organic electroluminescent device comprising:
the structure comprises a glass substrate, an ITO film, a hole injection layer, a hole transport layer, a light emitting structure layer, an electron transport layer, an electron injection layer and a metal electrode; the ITO film is arranged above the glass substrate, the hole injection layer is arranged on the ITO film, the hole transport layer is arranged on the upper surface of the hole injection layer, the light-emitting structure layer is arranged on the upper surface of the hole transport layer, the electron transport layer is arranged on the upper surface of the light-emitting structure layer, the electron injection layer is arranged on the upper surface of the electron transport layer, and the metal electrode is arranged on the upper surface of the electron injection layer;
the light emitting structure layer includes: a yellow light emitting layer, a transition layer and a red light emitting layer; the yellow light-emitting layer is arranged on the upper surface of the electron transport layer, the transition layer is arranged on the upper surface of the transition layer, the red light-emitting layer is arranged on the upper surface of the transition layer, and the hole transport layer is arranged on the upper surface of the red light-emitting layer;
the yellow light emitting layer is made of 8-hydroxyquinoline aluminum and 4- (dimercaptomethylene) -2-methyl-6- (p-dimethylamino styryl) -4H-pyran by mixing; the transition layer is made of a mixture of tri (4-carbazole-9-phenyl) amine and 8-hydroxyquinoline aluminum; the material of the red light emitting layer is formed by mixing tri (4-carbazole-9-phenyl) amine and (E) -4-dinitrile methylene-2-tert-butyl-6- (1,1,7, 7-tetramethyl julolidine vinyl) pyran.
Optionally, the light emitting structure layer further includes: a dielectric film; the dielectric film is arranged between the electron transmission layer and the yellow light emitting layer.
Optionally, the dielectric film is made of 8-hydroxyquinoline aluminum; the thickness of the dielectric film is 3-8 nm.
Optionally, the thickness of the yellow light emitting layer is 3-10 nm; the thickness of the transition layer is 5-10 nm; the thickness of the red light emitting layer is 10-20 nm.
Optionally, the thickness of the ITO film is 140-160 nm; the thickness of the hole injection layer is 5-12 nm; the thickness of the hole transport layer is 30-40 nm; the thickness of the electron transmission layer is 30-60 nm; the thickness of the electron injection layer is 0.5-1 nm; the thickness of the metal electrode is 100-200 nm.
Optionally, the hole injection layer is made of N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine; the hole transport layer is made of tri (4-carbazole-9-phenyl) amine; the material of the electron transport layer is 4, 7-diphenyl-1, 10-phenanthroline; the electron injection layer is made of (8-hydroxyquinoline) -lithium; the metal electrode is made of aluminum.
Optionally, the material of the hole injection layer is 4,4',4 ″ -tris [ 2-naphthylphenylamino ] triphenylamine.
Optionally, the doping ratio of tris (4-carbazol-9-ylphenyl) amine and 8-hydroxyquinoline aluminum of the transition layer is 1: 3.
Optionally, the doping ratio of tris (4-carbazol-9-ylphenyl) amine and 8-hydroxyquinoline aluminum of the transition layer is 1: 5.
Optionally, the doping ratio of the 8-hydroxyquinoline aluminum and the 4- (dimercaptomethylene) -2-methyl-6- (p-dimethylaminostyryl) -4H-pyran in the yellow light-emitting layer is 23: 2; the doping ratio of the tri (4-carbazol-9-yl phenyl) amine and the (E) -4-dinitrile methylene-2-tertiary butyl-6- (1,1,7, 7-tetramethyl julolidine vinyl) pyran in the red light emitting layer is 23: 2.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a color-adjustable organic electroluminescent device, which is characterized in that a light-emitting structure layer of a traditional OLED device is improved, the light-emitting structure layer comprises a yellow light-emitting layer, a transition layer and a red light-emitting layer, the yellow light-emitting layer is made of 8-hydroxyquinoline aluminum and 4- (dimercaptomethylene) -2-methyl-6- (p-dimethylaminostyryl) -4H-pyran in a mixed manner, and the transition layer is made of tris (4-carbazole-9-yl phenyl) amine and 8-hydroxyquinoline aluminum in a mixed manner; the material of the red light emitting layer is formed by mixing tri (4-carbazole-9-yl phenyl) amine and (E) -4-dinitrile methylene-2-tert-butyl-6- (1,1,7, 7-tetramethyl julolidine vinyl) pyran; when a lower voltage is applied to the OLED device, the holes and the electrons are combined in the yellow light-emitting layer to emit yellow light; when a higher voltage is applied to the OLED device, holes and electrons combine in the red light emitting layer, emitting red light. The invention realizes the color-adjustable OLED lamp by changing the voltage, can reduce the occupied space of the illuminating lamp and the number of multi-color lamp sheets, and reduces the cost for manufacturing the OLED illuminating lamp.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a structural diagram of a color tunable organic electroluminescent device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a color-adjustable organic electroluminescent device which has the advantages of reducing the number of multicolor lamp pieces, saving the occupied space of an illuminating lamp and avoiding the defect of partial red light at the tail part of an automobile.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Examples
FIG. 1 is a diagram of an embodiment of the present invention. As shown in fig. 1, the present invention provides a color tunable organic electroluminescent device, comprising: the organic light-emitting diode comprises a glass substrate 1, an ITO film 2, a hole injection layer 3, a hole transport layer 4, a light-emitting structure layer, an electron transport layer 8, a dielectric film 9, an electron injection layer 10 and a metal electrode 11. The ITO film 2 sets up in glass substrate 1 top, hole injection layer 3 sets up on the ITO film 2, hole transport layer 4 sets up on the upper surface of hole injection layer 3, the light emitting structure layer sets up on the upper surface of hole transport layer 4, electron transport layer 8 sets up on the upper surface of light emitting structure layer, electron injection layer 10 sets up on the upper surface of electron transport layer 8, metal electrode 11 sets up on the upper surface of electron injection layer 10.
The thickness of the ITO film 2 is 140-160 nm; the thickness of the hole injection layer 3 is 5-12 nm; the thickness of the hole transport layer 4 is 30-40 nm; the thickness of the electron transport layer 8 is 30-60 nm; the thickness of the electron injection layer is 0.5-1 nm; the thickness of the metal electrode is 100-200 nm. The material of the hole injection layer 3 is N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine; the material of the hole injection layer 3 may be 4,4',4 ″ -tris [ 2-naphthylphenylamino ] triphenylamine. The material of the hole transport layer 4 is tri (4-carbazole-9-phenyl) amine; the material of the electron transport layer 8 is 4, 7-diphenyl-1, 10-phenanthroline; the material of the electron injection layer 10 is 8-hydroxyquinoline) -lithium; the metal electrode 11 is made of aluminum.
The light emitting structure layer includes: a yellow light emitting layer 5, a transition layer 6 and a red light emitting layer 7; the yellow light-emitting layer 5 is arranged on the upper surface of the electron transport layer 8, the transition layer 6 is arranged on the upper surface of the yellow light-emitting layer 5, the red light-emitting layer 7 is arranged on the upper surface of the transition layer 6, and the hole transport layer 4 is arranged on the upper surface of the red light-emitting layer 7.
The yellow light-emitting layer 5 is made of 8-hydroxyquinoline aluminum and 4- (dimercaptomethylene) -2-methyl-6- (p-dimethylamino styryl) -4H-pyran by mixing; the material of the transition layer 6 is formed by mixing tri (4-carbazole-9-phenyl) amine and 8-hydroxyquinoline aluminum; the material of the red light emitting layer 7 is formed by mixing tri (4-carbazole-9-phenyl) amine and (E) -4-dinitrile methylene-2-tert-butyl-6- (1,1,7, 7-tetramethyl julolidine vinyl) pyran. The thickness of the yellow light-emitting layer 5 is 3-10 nm; the thickness of the transition layer 6 is 5-10 nm; the thickness of the red light emitting layer 7 is 10-20 nm. The doping ratio of the tri (4-carbazole-9-yl phenyl) amine and the 8-hydroxyquinoline aluminum of the transition layer 6 is 1:3 or 1: 5. The doping ratio of the 8-hydroxyquinoline aluminum and the 4- (dimercaptomethylene) -2-methyl-6- (p-dimethylamino styryl) -4H-pyran in the yellow light-emitting layer is 23: 2; the doping ratio of the tri (4-carbazol-9-yl phenyl) amine and the (E) -4-dinitrile methylene-2-tertiary butyl-6- (1,1,7, 7-tetramethyl julolidine vinyl) pyran in the red light emitting layer is 23: 2.
The dielectric film 9 is arranged between the electron transport layer 8 and the yellow light emitting layer 5, and the material of the dielectric film 9 is 8-hydroxyquinoline aluminum; the thickness of the dielectric film 9 is 3-8 nm. The dielectric film 9 acts as a hole blocking layer to block holes from entering the electron layer.
When different voltages are applied, different colors of light are emitted. When a lower voltage is applied to the color-tunable organic electroluminescent device, the transmission capability of electrons is poor and the electrons cannot penetrate through too many organic layers, while the transmission capability of holes is good, and the holes and the electrons are combined in the yellow light-emitting layer to emit yellow light. When a higher voltage is applied to the device, the transmission capability of electrons is enhanced to penetrate through the organic layer, and holes and electrons are combined in the red light emitting layer to emit red light. And the control voltage can be adjusted by modifying the doping ratio of tris (4-carbazol-9-ylphenyl) amine and aluminum 8-hydroxyquinoline in the transition layer.
The principle of emitting yellow light and red light is as follows: when the electrons and the holes meet in the light-emitting layer, a recombination effect can be generated, excitons are generated in the process of recombination, the excitons migrate under the action of an electric field, energy is transferred to a doping material in the light-emitting layer, the electrons in the doping material absorb the energy and then transit from a ground state to an excited state, because the excited state is unstable, the electrons can transit from the excited state back to the ground state again, energy is released at the same time, photons are generated, the electrons release photons with different energies in the process of transitioning back to the ground state according to the difference of the energy level of the excited state of the light-emitting material, the energy determines the wavelength of light according to the formula E-hv, and the wavelength means the color of the light. The energy of the photon in the yellow light emitting layer accords with the wavelength of yellow light to emit yellow light, and the energy of the photon in the red light emitting layer accords with the wavelength of red light to emit red light.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. A color tunable organic electroluminescent device, comprising:
the structure comprises a glass substrate, an ITO film, a hole injection layer, a hole transport layer, a light emitting structure layer, an electron transport layer, an electron injection layer and a metal electrode; the ITO film is arranged above the glass substrate, the hole injection layer is arranged on the ITO film, the hole transport layer is arranged on the upper surface of the hole injection layer, the light-emitting structure layer is arranged on the upper surface of the hole transport layer, the electron transport layer is arranged on the upper surface of the light-emitting structure layer, the electron injection layer is arranged on the upper surface of the electron transport layer, and the metal electrode is arranged on the upper surface of the electron injection layer;
the light emitting structure layer includes: a yellow light emitting layer, a transition layer and a red light emitting layer; the yellow light-emitting layer is arranged on the upper surface of the hole transport layer, the transition layer is arranged on the upper surface of the yellow light-emitting layer, the red light-emitting layer is arranged on the upper surface of the transition layer, and the electron transport layer is arranged on the upper surface of the red light-emitting layer;
the yellow light emitting layer is made of 8-hydroxyquinoline aluminum and 4- (dimercaptomethylene) -2-methyl-6- (p-dimethylamino styryl) -4H-pyran by mixing; the transition layer is made of a mixture of tri (4-carbazole-9-phenyl) amine and 8-hydroxyquinoline aluminum; the material of the red light emitting layer is formed by mixing tri (4-carbazole-9-yl phenyl) amine and (E) -4-dinitrile methylene-2-tert-butyl-6- (1,1,7, 7-tetramethyl julolidine vinyl) pyran;
the doping ratio of the tri (4-carbazole-9-yl phenyl) amine and the 8-hydroxyquinoline aluminum of the transition layer is 1:3 or 1: 5.
2. The color tunable organic electroluminescent device according to claim 1, wherein the light emitting structure layer further comprises: a dielectric film; the dielectric film is arranged between the electron transmission layer and the yellow light emitting layer.
3. The color tunable organic electroluminescent device of claim 2, wherein the dielectric film is made of 8-hydroxyquinoline aluminum; the thickness of the dielectric film is 3-8 nm.
4. The color-tunable organic electroluminescent device according to claim 1, wherein the yellow light-emitting layer has a thickness of 3 to 10 nm; the thickness of the transition layer is 5-10 nm; the thickness of the red light emitting layer is 10-20 nm.
5. The color tunable organic electroluminescent device according to claim 1, wherein the thickness of the ITO film is 140 nm and 160 nm; the thickness of the hole injection layer is 5-12 nm; the thickness of the hole transport layer is 30-40 nm; the thickness of the electron transmission layer is 30-60 nm; the thickness of the electron injection layer is 0.5-1 nm; the thickness of the metal electrode is 100-200 nm.
6. The color tunable organic electroluminescent device of claim 1, wherein the hole injection layer is made of N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine; the hole transport layer is made of tri (4-carbazole-9-phenyl) amine; the material of the electron transport layer is 4, 7-diphenyl-1, 10-phenanthroline; the electron injection layer is made of (8-hydroxyquinoline) -lithium; the metal electrode is made of aluminum.
7. The color tunable organic electroluminescent device of claim 1, wherein the hole injection layer is 4,4',4 "-tris [ 2-naphthylphenylamino ] triphenylamine.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SG118110A1 (en) * | 2001-02-01 | 2006-01-27 | Semiconductor Energy Lab | Organic light emitting element and display device using the element |
| CN101170852B (en) * | 2007-11-14 | 2010-05-19 | 电子科技大学 | An organic EL part with ultra-thin layer structure |
| CN102214800B (en) * | 2011-05-20 | 2013-07-24 | 电子科技大学 | White-light organic luminescent device and manufacturing method thereof |
| CN102956833B (en) * | 2011-08-29 | 2015-10-28 | 海洋王照明科技股份有限公司 | Organic electroluminescence device and preparation method thereof |
| CN102983287A (en) * | 2011-09-07 | 2013-03-20 | 海洋王照明科技股份有限公司 | Organic electroluminescence device and manufacturing method thereof |
| CN103137889A (en) * | 2011-11-28 | 2013-06-05 | 海洋王照明科技股份有限公司 | Organic light-emitting device and preparation method thereof |
| TWI733065B (en) * | 2012-08-03 | 2021-07-11 | 日商半導體能源研究所股份有限公司 | Light-emitting element, light-emitting device, display device, electronic appliance, and lighting device |
| CN203339228U (en) * | 2013-05-16 | 2013-12-11 | 彩虹（佛山）平板显示有限公司 | OLED lighting device with adjustable color |
| CN103346164B (en) * | 2013-07-13 | 2016-12-28 | 广州新视界光电科技有限公司 | A kind of organic electroluminescence device of Color tunable and preparation method thereof |
| CN103682117B (en) * | 2013-12-31 | 2017-10-27 | 北京维信诺科技有限公司 | A kind of organic light emission lighting device |
| CN104538553B (en) * | 2014-12-31 | 2017-08-04 | 北京维信诺科技有限公司 | A kind of organic electroluminescence device of Color tunable |
| CN107565039B (en) * | 2017-08-30 | 2019-09-27 | 电子科技大学 | A kind of discoloration OLED device and preparation method thereof |
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