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A 1,8-substituted carbazole-based tetradentate ring metal palladium (ii) complex phosphorescent material and its application

A phosphorescent material and metal palladium technology, which is applied in the field of tetradentate ring metal palladium complex phosphorescent materials, can solve the problems of device efficiency roll-off and low quantum efficiency, and can reduce energy, non-radiative attenuation, and conjugation. Effect

Active Publication Date: 2022-03-25
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long excited state lifetime makes excitons easy to be quenched and non-radiative transition occurs, so the quantum efficiency of metal palladium (II) complex phosphorescent materials is low, generally not more than 50%
In addition, the long excited state lifetime will also lead to serious efficiency roll-off of the device

Method used

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  • A 1,8-substituted carbazole-based tetradentate ring metal palladium (ii) complex phosphorescent material and its application
  • A 1,8-substituted carbazole-based tetradentate ring metal palladium (ii) complex phosphorescent material and its application
  • A 1,8-substituted carbazole-based tetradentate ring metal palladium (ii) complex phosphorescent material and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: The synthetic route of the tetradentate ring metal palladium (II) complex phosphorescent luminescent material PdDMCz is as follows:

[0041]

[0042] Synthesis of Intermediate 3: Compound 1 (1.00 g, 5.31 mmol, 1.0 equiv.), Compound 2 (2.07 g, 6.38 mmol, 1.2 equiv.) were successively added to a dry three-necked flask with a magnetic stirring rotor and a condenser tube. Cuprous (51 mg, 0.27 mmol, 5 mol%), 2-picolinic acid (65 mg, 0.53 mmol, 10 mol%), potassium phosphate (2.26 g, 10.62 mmol, 2.0 equiv), then purged with nitrogen three times, added under nitrogen protection Dimethyl sulfoxide (20 mL). The mixture was stirred in an oil bath at 90°C for 2 days, monitored by thin layer chromatography until the reaction of the starting material was complete, and cooled to room temperature. The reaction was quenched by adding a small amount of brine and extracted with ethyl acetate. The organic layer was washed twice with water, and the aqueous layer was extracte...

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Abstract

The invention provides a tetradentate ring metal palladium (II) complex phosphorescent material based on 1,8-substituted carbazole and its application. The phosphorescent material of the present invention can increase the dihedral angle between the substituted carbazole ring and the pyridine ring by introducing a substituent at the 1,8-position of the carbazole in the ligand, reduce the conjugation between the two, and reduce the material The lowest unoccupied molecular orbital (LUMO) orbital energy level of the molecule increases the metal-to-ligand transition (MLCT) ratio in the excited state molecules of the material, thereby increasing the intersystem crossing rate, shortening the lifetime of the excited state, and improving the phosphorescence quantum of the material molecules efficiency. The tetradentate ring metal palladium (II) complex phosphorescent luminescent material based on 1,8-substituted carbazole of the present invention has the characteristics of short excited state lifetime, high radiation transition rate, and high phosphorescent quantum efficiency, which shows that it has great potential in the field of OLEDs. application prospects.

Description

technical field [0001] The invention relates to a phosphorescent material and an application thereof, in particular to a tetradentate ring metal palladium (II) complex phosphorescent material based on 1,8-substituted carbazole and its application as a light-emitting layer in an organic light-emitting element. Background technique [0002] OLED is an organic light-emitting diode (Organic Light-Emitting Diode) or an organic light-emitting device (Organic Light-Emitting Device). , wide viewing angle; can also use cheap glass, flexible plastic and metal as the substrate; in addition, it also has the advantages of low cost, simple production process, and large-area production. Therefore, OLED has become a new generation of full-color display and lighting technology, which has broad and huge application prospects in high-end electronic products and aerospace; and also has a huge potential market in the field of flat solid-state lighting. [0003] Light-emitting materials are the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F15/00C09K11/06H01L51/50H01L51/54
CPCC07F15/006C09K11/06C09K2211/185C09K2211/1029C09K2211/1044H10K85/654H10K85/341H10K85/6572H10K50/11
Inventor 佘远斌李贵杰郑建兵
Owner ZHEJIANG UNIV OF TECH
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