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Stable white light OLED (Organic Light Emitting Diode) of multi-light-emitting-layer mixed parent structure without transmission layer

A technology of light-emitting layer and transmission layer, applied in the field of stable white light OLED, can solve the problems of reducing the luminous efficiency and spectral stability of the device, increasing the difficulty of carrier transmission, and increasing the difficulty of manufacturing, so as to avoid excessive turn-on voltage, Increase the coverage and the effect of small CIE coordinate offset

Active Publication Date: 2022-07-08
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, this method also has the following inherent problems: (1) The quality of the emitted white light depends on the mixing ratio of monochromatic light, and in order to balance the emission ratio of monochromatic light in each light-emitting layer, a thinner layer is usually inserted between the light-emitting layers. The spacer layer confines a certain amount of carriers in the respective light-emitting layers
It is difficult to obtain white light with high CRI for a device with double emitting layers, but if the number of emitting layers is increased, the number of spacer layers will also increase, which will make the structure of the device more complicated, making it more difficult to manufacture, and the potential of the device The barrier will also increase, reducing the luminous efficiency and spectral stability of the device
(3) Increasing the number of light-emitting layers will inevitably increase the overall thickness of the device, which will increase the difficulty of carrier transport and increase the probability of its annihilation

Method used

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  • Stable white light OLED (Organic Light Emitting Diode) of multi-light-emitting-layer mixed parent structure without transmission layer
  • Stable white light OLED (Organic Light Emitting Diode) of multi-light-emitting-layer mixed parent structure without transmission layer
  • Stable white light OLED (Organic Light Emitting Diode) of multi-light-emitting-layer mixed parent structure without transmission layer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation of a stable white light OLED with a mixed matrix structure of multiple light-emitting layers without the transport layer includes the following steps:

[0037] (1) The device structure is: ITO / MoO 3 (2nm) / MCP:PO-T2T:8wt%FIrPic(25nm) / CBP:BPhen:Ir(ppy) 3 (2:1, 8wt%, 25nm) / TCTA:BCP:8wt%PO-01(25nm) / Liq(1nm) / Al.

[0038] (2) Use acetone, ethanol, and deionized water to repeatedly clean the front and back sides of the ITO glass substrate for 10 minutes, followed by ultrasonic treatment in each of the above three solutions for 10 minutes in turn. The purpose is to remove dust and stains on the glass substrate. Then, the ITO glass substrate was taken out and dried, and then subjected to ultraviolet treatment for 10 min, in order to improve the surface work function of ITO.

[0039] (3) The treated ITO substrate is placed in a multi-source organic molecular vapor deposition system for evaporation, and the organic materials and metal materials used are placed i...

Embodiment 2

[0045] The preparation of a stable white light OLED with a mixed matrix structure of multiple light-emitting layers without the transport layer includes the following steps:

[0046] (1) The device structure is: ITO / MoO 3 (2nm) / MCP:PO-T2T:8wt%FIrPic(25nm) / CBP:BPhen:Ir(ppy) 3 (2:1,8wt%,25nm) / TCTA:BCP:PO-01(1:2,8wt%,25nm) / NPB:TmPyPB:8wt%Ir(piq) 2 (acac)(25nm) / Liq(1nm) / Al.

[0047] (2) Use acetone, ethanol, and deionized water to repeatedly clean the front and back sides of the ITO glass substrate for 10 minutes, followed by ultrasonic treatment in each of the above three solutions for 10 minutes in turn. The purpose is to remove dust and stains on the glass substrate. Then, the ITO glass substrate was taken out and dried, and then subjected to ultraviolet treatment for 10 min, in order to improve the surface work function of ITO.

[0048] (3) The treated ITO substrate is placed in a multi-source organic molecular vapor deposition system for evaporation, and the organic mater...

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Abstract

The invention discloses a stable white light OLED (Organic Light Emitting Diode) of a multi-light-emitting-layer mixed parent structure without a transmission layer, and belongs to the technical field of organic electroluminescent devices. The device sequentially comprises a glass substrate, an anode, three or four monochromatic light-emitting layers with different colors and a metal cathode. Each monochromatic light-emitting layer is formed by doping organic light-emitting dye in a mixed parent material in the form of a dopant, and the parent material is composed of a hole transport material and an electron transport material. No hole and electron transport layer is added to the device, and the injection layer is in direct contact with the light-emitting layer, so that the problem of influence on carrier transport due to over-thickness of the device is avoided. And the light-emitting layer is in direct contact with the hole / electron injection layer, and the mixed matrix adopts a gradient matrix structure, so that the transmission efficiency of current carriers from the injection layer to the light-emitting layer is improved. In addition, a spacer layer between the light-emitting layers is omitted, so that the transmission efficiency and the light-emitting efficiency of excitons are improved, and the spectrum stability is excellent. The plurality of light-emitting layers emit light of various colors, so that the color rendering index of the device is improved.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescence devices, and in particular relates to a stable white light OLED with a mixed matrix structure of multiple light-emitting layers without a transmission layer. Background technique [0002] With the development of science and technology, the technology of preparing White Organic Light Emitting Diode (WOLED) has been continuously improved. WOLED has become a new generation of solid-state lighting source after incandescent lamp, fluorescent lamp and LED. The heavy metal toxic substances used in the production process of fluorescent lamps and LEDs will cause environmental pollution, and the organic materials used in the preparation of WOLED will not pollute the environment, and there is no potential blue light hazard, so WOLED is a green light source in the true sense. . In addition, the preparation process of WOLED is simple, and the high-efficiency roll-to-roll preparation techno...

Claims

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Application Information

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IPC IPC(8): H01L51/50
CPCH10K50/13Y02B20/00
Inventor 陈平陈柯名李啊苏张富俊张茹
Owner JILIN UNIV
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