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Method for preparing organic electroluminescent device of copper (I) phosphorescence material

A phosphorescent material and electroluminescent technology, applied in electroluminescent light sources, luminescent materials, chemical instruments and methods, etc., can solve the problem of not showing the superiority of electrophosphorescent materials, and achieve the effect of high device efficiency

Active Publication Date: 2005-02-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

However, there are very few electrophosphorescence studies on copper (I) complexes in the literature, and only Jilin University carried out its preliminary research in 1999 (Advanced Materials, 11, 852-857, 1999)
They used a tetranuclear complex of copper (I) as a phosphorescent dye, doped it in polyvinyl carbazole host material, and prepared a multilayer device with a luminous brightness of 50cd / m 2 In the case of external quantum efficiency is only 0.1%, has not yet shown the superiority of the application as an electrophosphorescent material

Method used

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  • Method for preparing organic electroluminescent device of copper (I) phosphorescence material
  • Method for preparing organic electroluminescent device of copper (I) phosphorescence material
  • Method for preparing organic electroluminescent device of copper (I) phosphorescence material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: multilayer device with complex 1 / PVK as light-emitting layer

[0034] The device structure is: ITO / PEDOT / luminescent layer / BCP / Alq 3 / LiF / Al. The assembly conditions are as follows: a layer of conductive polymer-polythiophene derivative (PEDOT) is spin-coated on the clean ITO glass surface at a rotational speed of 3000 rpm, and then dried at 120°C for 30 minutes. Put PVK (polyvinyl carbazole) and complex 1 in CH 2 Cl 2 The solution is formulated into a solution with a weight ratio of 100 / 1, and spin-coated on the surface of the glass electrode modified by PEDOT under the condition of a rotating speed of 1500 rpm. After drying for 2 hours under high vacuum conditions, 10nm of BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline) and 50nm of Alq 3 (8-hydroxyquinoline aluminum), 1nm LiF and 100nm aluminum metal. The performance of the multilayer device is as follows: starting voltage 10V, maximum brightness 1000cd / m 2 , the maximum current efficiency is 2...

Embodiment 2

[0035] Example 2: Single-layer device with complex 2 / PVK / PBD as light-emitting layer

[0036] The device structure is: ITO / PEDOT / luminescent layer / Ca / Al. The assembly conditions are: PVK, PBD (2-(4-diphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole) and complex 2 in CH 2 Cl 2 The solution is formulated with a weight ratio of 100 / 40 / 2, and spin-coated on the surface of the ITO glass electrode modified by PEDOT under the condition of a rotating speed of 1500 rpm. After drying under high vacuum conditions for 2 hours, 1 nm of metallic calcium and 100 nm of metallic aluminum were vapor-deposited. The performance of a single-layer device is as follows: start-up voltage 10V, maximum brightness 1200cd / m 2 , the maximum current efficiency is 2.8cd / A, and the maximum luminous peak is 555nm.

Embodiment 3

[0037] Embodiment 3: multilayer device with complex 3 / PVK as light-emitting layer

[0038] The weight ratio of PVK to compound 2 in the light-emitting layer of the multilayer device is 100 / 2, and other assembly conditions are the same as in Example 1. The performance of multi-layer devices is as follows: start-up voltage 11V, maximum brightness 1400cd / m 2 , the maximum current efficiency is 3.2cd / A, and the maximum luminous peak is 525nm.

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Abstract

The invention relates to the application of four co ordinations quinolyl copper complexes with counter ion as phosophosrescence material in organic eletrolumniescence furniture. Tow craft is adopted. First, film by self no doping liquor. Second, film by macromolecule as main material cross blend liquorl. Use two methods, lead copper complexes to luminescent layer, and then add carrier transfer material to luminescent layer or lead single carrier transfer material to form monolayer or multilayer furniture. Thus, the organic eletrolumniescence furniture can gives off highly active light from red to green.

Description

technical field [0001] The invention belongs to the application of four-coordination monovalent copper complexes with counter ions as phosphorescent materials in organic electroluminescent devices. technical background [0002] The working principle of organic electroluminescent devices is based on the fact that holes and electrons are respectively injected from the positive and negative electrodes, recombined in the light-emitting layer to form excitons, and the excitons radiate and decay to emit light. According to spin statistical theory, singlet excitons and triplet excitons account for 25% and 75% respectively. Unlike organic small molecule fluorescent materials that can only utilize singlet energy, transition metal organic complex phosphorescent materials can fully utilize all energy forms including singlet and triplet states due to their strong spin-orbit coupling. Breaking through the 25% energy limit greatly improves the efficiency of organic electroluminescent dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06H05B33/20
Inventor 王利祥张其胜周全国耿延候马东阁
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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