A high color rendering index white light organic electroluminescent device and its preparation method

An electroluminescent device, high color rendering technology, applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of rare reports, low luminous efficiency of excimer associations, and white OLEDs that have not attracted scholars. concerns and other issues, to achieve the effect of simple structure, low production cost and wide range of choices

Active Publication Date: 2019-08-27
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low luminous efficiency of excimates, the research on the preparation of white light OLEDs by means of excimates has not attracted the attention of scholars, and related reports are scarce.

Method used

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  • A high color rendering index white light organic electroluminescent device and its preparation method
  • A high color rendering index white light organic electroluminescent device and its preparation method
  • A high color rendering index white light organic electroluminescent device and its preparation method

Examples

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preparation example Construction

[0026] The preparation method of the above-mentioned white light organic electroluminescence device, it comprises the following steps:

[0027] ①Use de-detergent, deionized water, acetone and ethanol solutions to ultrasonically clean the substrate in sequence, and put it in an oven for drying after cleaning.

[0028] ② Move the substrate into the vacuum coating chamber, prepare the anode layer, the hole transport layer, the blue light-emitting layer, the electron transport layer and the cathode layer by dry method or wet method in the order from bottom to top, and obtain White light organic electroluminescent devices. The anode layer, the hole transport layer, the blue light-emitting layer, the electron transport layer and the cathode layer are directly prepared sequentially by a dry method, or are sequentially prepared on the substrate through a wet process after being diluted with an organic solvent. For example, the process can be: vacuum evaporation Plating, ion beam depo...

Embodiment 1

[0036] Such as figure 1 As shown, the hole transport layer 3 in the device structure is TAPC, the host material 4 in the blue light-emitting layer is MCP, and the blue fluorescent light-emitting material 5 is a blue fluorescent light-emitting material DMACDPS (wherein the electron donor The group is acridine series 9,9-dimethyl-9,10-dihydroacridine (DMAC), the electron acceptor group is diphenylsulfone series Diphenylsulphone (DPS)), and the doping mass ratio is guest material: host material = 10% , the material used for the electron transport layer 6 is TPBi, and the cathode layer is Mg:Ag alloy with a ratio of 10:1. The entire device structure is described as:

[0037] Glass substrate / ITO / TAPC(40nm) / MCP:10%DMACDPS(20nm) / TPBi(40nm) / Mg:Ag(10:1, 200nm)

[0038] The preparation method is as follows:

[0039] (1) Use detergent, deionized water, acetone and ethanol solutions to ultrasonically clean the transparent conductive substrate ITO glass, and put it in an oven for drying...

Embodiment 2

[0046] Such as figure 1 As shown, the hole transport layer 3 in the device structure is TAPC, the host material 4 in the blue light-emitting layer is MCP, and the blue fluorescent light-emitting material 5 is a blue fluorescent light-emitting material DMACDPS (wherein the electron donor The group is acridine series 9,9-dimethyl-9,10-dihydroacridine (DMAC), the electron acceptor group is diphenyl sulfone series Diphenylsulphone (DPS)), and the doping mass ratio is guest material: host material = 20% , the material used for the electron transport layer 6 is TPBi, and the cathode layer is Mg:Ag alloy with a ratio of 10:1. The entire device structure is described as:

[0047] Glass substrate / ITO / TAPC(60nm) / MCP:20%DMACDPS(20nm) / TPBi(40nm) / Mg:Ag(10:1, 200nm)

[0048] The preparation steps of the device are similar to those in Example 1.

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Abstract

The invention discloses a high color rendering index white light organic electroluminescent device and a preparation method thereof. The device comprises a substrate, an anode layer, an organic functional layer and a cathode layer from bottom to top, and the organic functional layer is sequentially from bottom to top It includes a hole transport layer, a blue light-emitting layer and an electron transport layer. The blue light-emitting layer is composed of one of the following two methods: ① A host-guest doped structure formed by doping a blue fluorescent light-emitting material with a host material. The doping mass ratio of the color fluorescent light-emitting material is 1% to 20%; ②The non-doped structure is formed by a single-layer host material close to the hole transport layer and a single-layer blue fluorescent light-emitting material close to the electron transport layer. The present invention only utilizes a blue fluorescent material to generate blue light, combines the hole transport layer and the main material to form the orange light and red light generated by the electro-exciter association, realizes white light emission with high color rendering index, and simplifies the device at the same time The structure and preparation process reduce the production cost and improve the spectral stability of the device.

Description

technical field [0001] The invention relates to the field of organic photoelectric technology in electronic components, in particular to a high color rendering index white light organic electroluminescent device and a preparation method thereof. Background technique [0002] White organic light-emitting devices (Organic light-emitting devices, OLEDs) is a new type of display technology, which is widely used in various fields of daily production and life such as flat panel display, solid-state lighting, and flexible transparent display, and can meet the needs of the world today. Energy saving, low-carbon environmental protection and green living requirements. The color rendering index is an evaluation index of the ability of the light source to express the color of the material itself. The closer the color rendering index is to 100, the better the color rendering of the light source. In OLED devices, in order to achieve white light, two luminescent dyes based on the principl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/54H01L51/50H01L51/56
CPCH10K85/615H10K85/655H10K85/654H10K50/12H10K50/11H10K71/00
Inventor 赵娟杨湛陈晓洁杨志涌于涛郑世昭池振国张艺刘四委许家瑞
Owner SUN YAT SEN UNIV
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