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Organic light-emitting device and preparation method thereof

An electroluminescence device and luminescence technology, applied in the direction of electric solid-state devices, chemical instruments and methods, semiconductor/solid-state device manufacturing, etc., can solve the problems of light-emitting devices such as easy luminescence quenching, difficult process control, and poor performance, and achieve Good performance complementation and charge balance, improved thermal stability, and improved luminous performance

Inactive Publication Date: 2014-03-26
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the electron injection layer material is lithium salt and / or cesium salt, but lithium salt and / or cesium salt need to be combined with a specific electron transport layer such as tri-(8-quinolinolato)aluminum (tri-(8-quinolinolato)aluminum,Alq 3 ) and other synergistic effects can improve the performance of the device. When using lithium salt or cesium salt alone as the electron injection material, the organic electroluminescent device is easy to luminescence quenching, poor performance, low efficiency, and lithium salt and / or cesium salt As an electron injection material, the thickness of the electron injection layer is required to be very thin, which is difficult to control in the process

Method used

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  • Organic light-emitting device and preparation method thereof
  • Organic light-emitting device and preparation method thereof

Examples

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Embodiment 1

[0078] A method for preparing an organic electroluminescent device, comprising the following steps:

[0079] (1) Pre-treatment of ITO glass substrates: cleaning with detergent → cleaning with deionized water → cleaning with acetone → cleaning with ethanol, all of which are cleaned with an ultrasonic cleaning machine. Each washing is carried out for 5 minutes, stopped for 5 minutes, and repeated 3 times respectively. method, and then dry it in an oven for use; the cleaned ITO glass also needs to be subjected to surface activation treatment to increase the oxygen content on the ITO surface and improve the work function of the ITO surface; the ITO thickness is 100nm;

[0080] (2) Preparation of the hole injection layer: the MoO 3 Doped into NPB as a hole injection layer, the doping mass fraction is 30wt%, the thickness is 12.5nm, and the vacuum degree is 1×10 -5 Pa, evaporation rate

[0081] (3) Preparation of hole transport layer: using NPB; vacuum degree 1×10 -5 Pa, evapor...

Embodiment 2

[0088] A method for preparing an organic electroluminescent device, comprising the following steps:

[0089] (1) Pre-treatment of ITO glass substrates: cleaning with detergent → cleaning with deionized water → cleaning with acetone → cleaning with ethanol, all of which are cleaned with an ultrasonic cleaning machine. Each washing is carried out for 5 minutes, stopped for 5 minutes, and repeated 3 times respectively. method, and then dry it in an oven for use; the cleaned ITO glass also needs to be subjected to surface activation treatment to increase the oxygen content on the ITO surface and improve the work function of the ITO surface; the ITO thickness is 100nm;

[0090] (2) Preparation of the hole injection layer: the WO 3 Doped into TCTA as a hole injection layer, the doping mass fraction is 25wt%, the thickness is 10nm, and the vacuum degree is 5×10 -5 Pa, evaporation rate

[0091] (3) Preparation of hole transport layer: using TCTA; vacuum degree 5×10 -5 Pa, evapora...

Embodiment 3

[0098] A method for preparing an organic electroluminescent device, comprising the following steps:

[0099] (1) Pre-treatment of ITO glass substrates: cleaning with detergent → cleaning with deionized water → cleaning with acetone → cleaning with ethanol, all of which are cleaned with an ultrasonic cleaning machine. Each washing is carried out for 5 minutes, stopped for 5 minutes, and repeated 3 times respectively. method, and then dry it in an oven for use; the cleaned ITO glass also needs to be subjected to surface activation treatment to increase the oxygen content on the ITO surface and improve the work function of the ITO surface; the ITO thickness is 100nm;

[0100] (2) Preparation of the hole injection layer: the V 2 o 5 Doped into CBP as a hole injection layer, the doping mass fraction is 35wt%, the thickness is 15nm, and the vacuum degree is 5×10 -5 Pa, evaporation rate

[0101] (3) Preparation of hole transport layer: using CBP; vacuum degree 5×10-5Pa, evaporat...

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Abstract

The invention provides an organic light-emitting device and a preparation method of the organic light-emitting device. The organic light-emitting device comprises a conductive anode substrate, a hole injection layer, a hole transfer layer, a red light emitting layer, an electron transfer layer, an electron injection layer and a cathode which are sequentially stacked, wherein the electron injection layer is made of a mixed material formed by doping stearate, villiaumite and lithium salt or cesium salt into an electron injection material, the electron injection material is 4,7-diphenyl-1,10-phenanthroline, 4,7-diphenyl-1,10-phenanthroline, aluminum 4-diphenol-2(2-methyl-8-hydroxyquinoline), aluminum 8-hydroxyquinoline, 3-(biphenyl-4-base)-5-(4-tertiary butylphenyl)-4-phenyl-4H-1,2,4-triazole, or 1,3,5-3(1-phenyl-1H-benzimidazole-2-base)benzene. The organic light-emitting device provided by the invention has excellent luminescence efficiency and luminescence property.

Description

technical field [0001] The invention relates to the related field of electronic devices, in particular to an organic electroluminescent device and a preparation method thereof. Background technique [0002] In 1987, C.W.Tang and Van Slyke of Eastman Kodak Company in the United States reported a breakthrough in the research of organic electroluminescence. A high-brightness, high-efficiency double-layer organic electroluminescent device (OLED) has been prepared using ultra-thin film technology. In this double-layer structure device, the brightness reaches 1000cd / m at 10V 2 , its luminous efficiency is 1.51lm / W, and its lifespan is more than 100 hours. [0003] The principle of OLED light emission is based on the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, and holes are injected from the anode to the highest occupied orbital (HOMO) of organic matter. Electrons and holes mee...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/54H01L51/56C09K11/06
CPCH10K71/00H10K50/171H10K50/15H10K50/17
Inventor 周明杰王平钟铁涛张振华
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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