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Preparation method of blue phosphorescent host material having bipolar carrier transport performance

A bipolar carrier and host material technology, applied in chemical instruments and methods, semiconductor/solid-state device manufacturing, organic chemistry, etc., can solve the problems of unbalanced carrier injection, low mCPTg, unsuitability, etc., and achieve simplification The effect of easy control of structure and reaction process

Inactive Publication Date: 2013-02-13
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

For example, the most commonly used phosphorescent host material 4,4'-bis(9-carbazole)-biphenyl (CBP), when used as the host material for green, yellow and red light, the internal quantum efficiency of the device can reach 60 %-80%, the external quantum efficiency is higher than 10%, but its triplet energy level is only 2.56eV, so it is not suitable as a host material for blue phosphorescence
[0006] In recent years, the host materials based on hole transport ability and electron transport ability have made great progress, such as mCP, UGH3, etc., but these materials have certain defects, such as the Tg of mCP is too low, and the Tg of UGH3 is too low. The electron transport ability is too strong, resulting in unbalanced carrier injection

Method used

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  • Preparation method of blue phosphorescent host material having bipolar carrier transport performance
  • Preparation method of blue phosphorescent host material having bipolar carrier transport performance
  • Preparation method of blue phosphorescent host material having bipolar carrier transport performance

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Embodiment Construction

[0024] The blue phosphorescent host material provided by the present invention is composed of carbazole with hole transport ability and diphenylphosphineoxy unit with electron transport ability, and its general structural formula is as follows:

[0025]

[0026] Wherein, R1 can be ethyl, propyl, isopropyl, phenyl, phenethyl, triphenylsilyl, p-phenylbenzimidazolyl, p-triphenylamine;

[0027] R2, R3, R4, R5 are diphenylphosphineoxy, which can be substituted at the 2,7 or 3,6 positions;

[0028] The specific structures and names of the substituents of R1, R2, R3, R4, and R5 are shown in Table 1:

[0029]

[0030] In Example 1 of the present invention, R1 is ethyl, R2, R4 are diphenylphosphineoxy, R3, R5 are H, that is, when the 2 and 7 positions are substituted, the preparation process of the compound (EPO27) comprises the following steps:

[0031]Step 1: Preparation of 4,4-dibromo-2-nitrobiphenyl: Dissolve 4,4-dibromobiphenyl in glacial acetic acid to make a solution and ...

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Abstract

The invention provides a blue phosphorescent host material having bipolar carrier transport performance and a preparation method thereof. The host material is composed of carbazolyl groups having a hole transport capability and phenylphosphino groups having an electron transport capability. The structural general formula is shown in the specification, wherein R1 is one of ethyl, propyl, isopropyl, phenyl, phenethyl, triphenylsilyl, p-phenylbenzimidazolyl and p-triphenylamino; and R2, R3, R4 and R5 are diphenylphosphinyl, can be substituents on site 2 and 7 and can also be substituents on site 3 and 6.

Description

technical field [0001] The invention belongs to the technical field of chemical products and preparation methods, and relates to a blue phosphorescence host material with bipolar carrier transport performance. Background technique [0002] Global real-time information exchange makes people have higher and higher performance requirements for display devices, so the display industry is becoming one of the pillar industries of the electronic information industry. Display technologies that exist today include cathode ray tubes (CRTs), liquid crystal displays (LCDs), plasma displays (PDPs), field emission (FEDs), and organic electroluminescence (OLEs), among others. As a new generation of flat panel display technology, organic electroluminescent devices (OLEDs) stand out for their excellent light characteristics and low power consumption. Organic electroluminescent devices (OLEDs) have many excellent advantages: (1) high resolution, High contrast, high brightness (up to 300cd / m2...

Claims

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Application Information

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IPC IPC(8): C07F9/572C07F9/53H01L51/54
Inventor 高淑雅吕磊孔祥朝陈维铅
Owner SHAANXI UNIV OF SCI & TECH
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