Top emitting white light organic electroluminescent device and its preparation method

An electroluminescent device, top emission technology, applied in the direction of electric solid device, semiconductor/solid-state device manufacturing, electrical components, etc. problem, to achieve the effect of improving light extraction, improving conversion efficiency, and improving luminous efficiency

Inactive Publication Date: 2018-07-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current top-emitting white light device using the down-conversion method, because the blue light part is still affected by the microcavity effect, the white light has a problem of spectral angle dependence.
In addition, most of the commonly used down-conversion layer materials are organic materials, and the absorption of organic materials is usually in the ultraviolet band, which will reduce the conversion efficiency of blue light pumping and lead to low luminous efficiency of white light devices.

Method used

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  • Top emitting white light organic electroluminescent device and its preparation method
  • Top emitting white light organic electroluminescent device and its preparation method
  • Top emitting white light organic electroluminescent device and its preparation method

Examples

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Effect test

Embodiment 1

[0041] A microstructure quantum dot down-conversion film with a micro-cylindrical array on the surface was prepared by using a silicon-based microstructure template, with a thickness of 1 mm. Among them, CdSe / ZnS red light quantum dots with a light emission band of 630nm are used as the down-conversion material, and PMMA is used as the polymer host material. The microcolumns in the array have a diameter of 20 μm, a height of 5 μm, and a periodic pitch of 40 μm. Fabrication of Structure Glass Substrate / Ag(100nm) / MoO by Vacuum Evaporation 3 (3nm) / TAPC(40nm) / TCTA(5nm) / TCTA: Firpic(25nm) / TmPyPB(50nm) / Liq(2nm) / Sm(20nm) / TAPC(60nm) top-emitting blue light device, in which the light-emitting layer TCTA : The doping ratio of Firpic is 8:1. A top-emitting white light organic electroluminescent device is prepared by covering the microstructure quantum dot down-conversion film on the above-mentioned top-emitting blue light device. The detailed preparation process is as follows:

[004...

Embodiment 2

[0051] For comparison, a planarized quantum dot down-converting film was prepared using a common silicon wafer with a thickness of 1 mm and no pattern on its surface. CdSe / ZnS quantum dots with a luminescence wavelength of 630nm are used as the down-conversion material, and PMMA is used as the polymer host. The fabrication process of the planarized quantum dot down-conversion film is the same as that of the microstructure quantum dot down-conversion film in Example 1 except that the silicon-based template used is different. Prepare the same structure as glass substrate / Ag(100nm) / MoO by vacuum evaporation 3 (3nm) / TAPC(40nm) / TCTA(5nm) / TCTA: Firpic(25nm) / TmPyPB(50nm) / Liq(2nm) / Sm(20nm) / TAPC(60nm) top-emitting blue light device, in which the light-emitting layer TCTA : The doping ratio of Firpic is 8:1. A planarized quantum dot down-conversion film is covered on the top-emitting blue light device to prepare a top-emitting white light organic electroluminescent device. The detail...

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Abstract

The invention discloses a top emitting white light organic electroluminescent device and its preparation method, and belongs to the technical field of organic electroluminescence. The appliance comprises a top emitting blue light organic electroluminescent device and a micro-structure quantum dot lower converting film; the quantum dot material is used for absorbing a part of energy of the top emitting blue light appliance to generate photoluminescence; finally, two colors of lights are mixed to generate white light. By using the lower converting structure, the stability of spectrum along voltage and time is improved. By using the quantum dot as the lower converting material, the converting efficiency of the blue light pumping in the conversion process is improved, the lighting efficiency of the top emitting white light appliance is promoted. Through the embossing method, the microstructure array is introduced to the surface of the lower converting film of the quantum dot, the microstructure array can improve the light intake, scatter the light beam, and improve the angle stability of the spectrum.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescence, and in particular relates to a top-emitting white light organic electroluminescence device and a preparation method thereof. Background technique [0002] In recent years, the research on white light organic electroluminescent devices has made a breakthrough under the active investment of major lighting manufacturers and research institutions in the world. Compared with ordinary bottom-emitting white light devices, top-emitting white light devices can be fabricated on any substrate, and combined with silicon-based CMOS chips can realize silicon-based OLED microdisplays. Moreover, the top-emitting white light device is the premise of realizing full-color high-resolution OLED micro-display. If it is prepared on a flexible substrate, it can realize high-aperture high-resolution flexible display and flexible lighting (M.Thomschke, S.Reineke, B.Lussem, K. Leo, Nano Lett. 2012, 12,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/54H01L51/56
CPCH10K85/00H10K50/80H10K71/00
Inventor 张乐天尹茂军谢文法于紫薇
Owner JILIN UNIV
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