Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (12): 2717.doi: 10.7503/cjcu20200384

• Inorganic Chemistry • Previous Articles     Next Articles

Synthesis of an Orange-red-emitting Cationic Iridium(III) Complex Containing a Triphenylamine-triazole Bipolar Unit and Its Application in LEDs

CHEN Qiuhong, YE Yanchun, REN Mengran, WANG Kaimin(), TANG Huaijun(), WANG Zhengliang, ZHOU Qiang   

  1. Key Laboratory of Green?Chemistry Materials in University of Yunnan Province,School of Chemistry & Environment,Yunnan Minzu University,Kunming 650500,China
  • Received:2020-06-23 Online:2020-12-10 Published:2020-12-09
  • Contact: TANG Huaijun E-mail:wkmchemistry@qq.com;tanghuaijun@sohu.com
  • Supported by:
    ? Supported by the Open Fund for Key Lab of Guangdong High Property and Functional Macromolecular Materials, China(20190009);the National Natural Science Foundation of China(21762049)

Abstract:

A novel orange-red-emitting cationic organic iridium(Ⅲ) complex, [(npy)2Ir(DPPTA)]PF6, containing a triphenylamine-triazole bipolar unit was synthesized using 2-naphthyl pyridine(npy) as main ligand and NN-diphenyl-4-[4-phenyl-5-(pyridin-2-yl)-4H-1,2,4-triazol-3-yl]aniline(DPPTA) as ancillary ligand. The thermal decomposition temperature of the complex was 345 ℃, from 20 ℃ to 100 ℃, its relative photoluminescent emission intensity reduction was 28.0%, however the light color was unchanged, suggesting that the complex can be well used in LEDs. Mainly due to the bipolar unit, the complex can efficiently absorb and be excited by the blue light(λem,max=455 nm) of GaN chips. Excited by blue-emitting GaN chips, orange-red LEDs can be fabricated by only using [(npy)2Ir(DPPTA)]PF6 as down-conversion luminescent material, and efficient neutral and warm white LEDs can be obtained when yellow-emitting Y3Al5O12∶Ce3+(YAG∶Ce3+) was used together.

Key words: Cationic iridium(III) complex, Bipolar unit, Warm white light-emitting diode, Down-conversion luminescent material

CLC Number: 

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