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White organic light emitting device with single light emitting layer structure

A technology for electroluminescent devices and light-emitting layers, applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problems of complex preparation process, color drift, high cost, etc., achieve simplified device structure, reduce preparation cost, improve color Effects of Degree Stability and Efficiency Stability

Inactive Publication Date: 2013-07-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the efficiency of the three-emitting layer device is high, on the one hand, its preparation process is complicated and the cost is high; on the other hand, the carrier recombination region will move with the change of the driving voltage, resulting in the change of the color coordinates with the driving voltage, that is, the phenomenon of color drift.

Method used

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  • White organic light emitting device with single light emitting layer structure

Examples

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Embodiment 1

[0019] In this example, see figure 1 , a white light organic electroluminescent device with a single light-emitting layer structure, its structure is mainly composed of an ITO glass substrate 1, a hole transport layer 2, an electron blocking layer 3, a light-emitting layer 4, an electron transport layer 5 and a composite cathode 6, The light-emitting layer 4 is composed of a host-guest doping system to form a single-layer light-emitting layer. The host material constituting the light-emitting layer 4 is 1,3-bis (9-carbazolyl) benzene, that is, mCP, 2,6-bis(N-carbazolyl) pyridine , namely mCPy, the guest material constituting the light-emitting layer 4 is platinum [1,3-difluoro-4,6-di (2-pyridinyl) benzene] chloride, namely Pt-4, and the doping concentration of the guest material is 8 wt %, Its emission spectrum contains blue light peak and red light peak at the same time, blue light and red light are further mixed to form white light, and the thickness of the light-emitting la...

Embodiment 2

[0021] This embodiment is basically the same as Embodiment 1, especially in that:

[0022] In this embodiment, the host material in the light-emitting layer 4 is mCPy, and the guest material is platinum (II) [1, 3-difluoro-4, 6-di(2-pyridinyl) benzene] chloride, that is, the FPt doping concentration is 12 wt%, the electron blocking layer material is TCTA, the electron transport layer material is 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline), that is, BCP. The white light emitted by the organic electroluminescent device in this embodiment has high brightness, high efficiency, high color purity and stable chromaticity.

Embodiment 3

[0024] This embodiment is basically the same as the previous embodiment, and the special features are:

[0025] In this embodiment, the host material in the light-emitting layer 4 is mCP, and the guest material is platinum N^C2^N-[1,3-di(4-methoxy-pyrid-2-yl)-4,6-difluorobenzene]chloride , that is, PtL 26 Cl, the doping concentration is 20 wt%, the electron blocking layer material is TCTA, and the electron transport layer material is TPBI. The white light emitted by the organic electroluminescent device in this embodiment also has the characteristics of high brightness, high efficiency, high color purity and stable chromaticity.

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Abstract

The invention discloses a white organic light emitting device with a single light emitting layer structure. According to the structure, the white organic light emitting device with the single light emitting layer structure is mainly composed of an ITO glass substrate, a hole transfer layer, an electron blocking layer, a light emitting layer, an electron transfer layer and a composite cathode, wherein the light emitting layer forms a single-layer light emitting layer through a subject-object doping system in a composite mode, subject materials forming the light emitting layer are mCPy, object materials forming the light emitting layer are excimer phosphorescence dye, the doping concentration of the object materials is between 8 wt% and 20 wt%, the light emitting layer can simultaneously emit blue light and red light, and the blue light and the red light are mixed to form white light. A triplet state energy level of the electron blocking layer and a triplet state energy level of the electron transfer layer are both higher than a triplet state energy level of the object materials of the light emitting layer, excition can be effectively bound in the light emitting layer, and an exicition binding structure is formed. The white organic light emitting device with the single light emitting layer structure has the advantages of being simple in structure and stable in chromaticity and efficiency.

Description

technical field [0001] The invention relates to an organic electroluminescent device, in particular to a white light organic electroluminescent device, which is applied in the technical field of production and manufacture of organic electroluminescent display screens. Background technique [0002] White organic light emitting device (White Organic Light Emitting Device, OLED) has great potential in the fields of flat panel display, LCD backlight module and lighting due to its ultra-thin, flexible, fast response, low power consumption and simple fabrication. It has great application potential, especially in realizing large-area display. These applications require white OLEDs to have the characteristics of high brightness, high efficiency, long life, high color purity, and chromaticity stability. [0003] The most commonly used structure for realizing white light OLED devices is a three-light-emitting layer structure, that is, three light-emitting layers with three primary co...

Claims

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Application Information

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IPC IPC(8): H01L51/54
Inventor 朱文清吴晓亮孙文兵汤梅孙亮亮熊凌昊
Owner SHANGHAI UNIV
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