Organic electroluminescent iridium coordination compound and preparation method and application thereof

An iridium complex, electroluminescence technology, applied in the directions of organic chemistry, luminescent materials, chemical instruments and methods, etc., can solve the problems of difficult synthesis of electroluminescent iridium complexes, low electroluminescence efficiency, poor solution processing performance, etc., Achieve the effect of improving carrier injection and transport capabilities, good host material properties, and promoting energy transfer

Inactive Publication Date: 2010-06-30
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of difficult synthesis, poor thermal stability, poor solution processability and low electroluminescent efficiency of the existing electrol

Method used

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  • Organic electroluminescent iridium coordination compound and preparation method and application thereof
  • Organic electroluminescent iridium coordination compound and preparation method and application thereof
  • Organic electroluminescent iridium coordination compound and preparation method and application thereof

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Experimental program
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specific Embodiment approach 1

[0026] Specific Embodiment 1: The organic electroluminescent iridium complex of this embodiment uses trivalent iridium as the ion as the central ion, and alkyl-substituted phenyl benzimidazole modified by a hole-transporting group as the ligand, and its general formula is as follows:

[0027]

[0028] Wherein, Ar is a hole-transporting group of carbazole, a carbazole derivative or a triarylamine derivative, m=0~3, n=2~6, m and n are both positive integers, and the structural formula of the ligand is:

[0029]

[0030] In the organic electroluminescent iridium complex of this embodiment, when m is not 0, the alkyl group substituted by the hole transport group is at the 2-position, 3-position, 4-position and 5-position on the phenyl group of phenylbenzimidazole Substitutions are made at one, two or three of the four substituted positions of a position.

[0031] In this embodiment, Ar is a hole transport group, and when Ar is a carbazole derivative, Ar is 3,6-alkylcarbazole...

specific Embodiment approach 2

[0033] Specific embodiment two: the difference between this embodiment and specific embodiment one is that Ar is carbazole, m=0, and the ligand is 1-(carbazole-N-alkyl)-2-phenylbenzimidazole, whose structural formula as follows:

[0034] Wherein n=2~6. Other parameters are the same as in the first embodiment.

[0035] The organic electroluminescent iridium complex of this embodiment is a 1-(carbazole-N-alkyl)-2-phenylbenzimidazole iridium complex (referred to as Ir(CzPhBI) 3 ).

[0036] This embodiment is for Ir(CzPhBI) 3 Carry out thermogravimetric analysis, the thermogravimetric curve that test obtains is as follows figure 1 shown in . Depend on figure 1 It can be seen that the Ir(CzPhBI) of this embodiment 3 Its thermal decomposition temperature is 402°C, and it has good thermal stability.

[0037] In this embodiment, Ir(CzPhBI) 3 It was dissolved in dichloromethane solvent to form a solution, and the solution was tested by ultraviolet fluorescence spectrum, and ...

specific Embodiment approach 3

[0038] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that Ar is carbazole, m=1, and the alkyl group modified by the hole transport group is substituted on the 2-position of the phenyl group of phenylbenzimidazole, The ligand is 1-(carbazole-N-alkyl)-2-(2-carbazole-N-alkoxyphenyl)benzimidazole, and its structural formula is as follows:

[0039] Wherein n=2~6. Other parameters are the same as in the first embodiment.

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Abstract

The invention provides an organic electroluminescent iridium coordination compound and a preparation method and application thereof, relating to an iridium-containing organic electroluminescent material and a preparation method thereof and application thereof. The invention solves the problems of the electroluminescent iridium coordination compound with a host-guest intergraded structure such as difficult synthesis, bad thermo-stabilization performance, bad solution processing performance and low electroluminescent efficiency. The coordination compound has the following formula. The method comprises the steps of: reacting benzaldehyde or ramification of the benzaldehyde with o-phenylenediamine; reacting a product after the reaction with hole transport group-substituted bromine to obtain ligand; reacting the ligand with iridium chloride; and reacting a product with glycerol and potassium carbonate to obtain the coordination compound. The organic electroluminescent iridium coordination compound is used in an organic electroluminescent device. The thermal decomposition temperature of the coordination compound is 402 DEG C, the synthesis is easy, the current density of the electroluminescent device is 200-450 mA/square centimeter, the luminosity is 2800-11000 cd/square meter, and the maximum external quatum efficiency is 6%.

Description

technical field [0001] The invention relates to an iridium-containing organic electroluminescent material and its preparation method and application, in particular to an alkyl-substituted phenylbenzimidazole iridium complex modified by a hole transport group, its preparation method and its application in electroluminescence device applications. Background technique [0002] In the past ten years, optoelectronic information functional materials have received extensive attention and research as new materials with broad application prospects. Among them, organometallic complexes are used in organic electroluminescence and organic memory, or in organic laser and dye-sensitive materials. All of them have shown unique properties and broad application prospects. In recent years, with the gradual popularization of portable electronic devices, people have higher and higher requirements for the light weight and small size of display terminals. As a representative of the next generati...

Claims

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Application Information

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IPC IPC(8): C07D403/06C07D403/14C09K11/06H01L51/50H01L51/54
Inventor 许辉蔡俊喜韩春苗于东慧
Owner HEILONGJIANG UNIV
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