一种吡嗪铱(Ⅲ)配合物的晶体结构及光物理性质

doi:10.3866/PKU.WHXB201411212

Abstract

Abstract:

An iridium(Ⅲ) complex of (MDPPF)₂Ir(acac) (MDPPF=4,4'-difluoro-5-methyl-2,3-diphenylpyrazine, acac=acetylacetone) has been prepared and characterized by X-ray single crystal diffraction. The photophysical properties of (MDPPF)₂Ir(acac) were investigated using UV-Vis spectroscopy and photoluminescence (PL) techniques. X-ray diffraction (XRD) studies revealed that the complex belongs to a triclinic systemof the P1 space group with cell dimensions a=1.13984(3) nm, b=1.26718(3) nm, c=1.29541(3) nm, α=93.7181(19)°, β= 101.638(2)°, γ=110.853(3)° and V=1.69336(7) nm³.Asolution of the (MDPPF)₂Ir(acac) complex in dichloromethane was found to emit yellowlight with amaximumpeak at 555 nmat roomtemperature. Furthermore, (MDPPF)₂Ir(acac) was used as a phosphorescence dopant in organic light-emitting diodes (OLEDs) with the structures of ITO/NPB (40 nm)/CBP:(MDPPF)₂Ir(acac) (20 nm)/TPBi (10 nm)/Alq₃ (30 nm)/LiF (1 nm)/Al (100 nm). These devices showed yellowemission at 558 nm, a maximumbrightness of 32700 cd·m^-2, current efficiency of 44.7 cd·A^-1 and power efficiency of 20.7 lm·W^-1.

Key words: Iridium(Ⅲ) complex, Pyrazine, Phosphorescent material, Organic light-emitting diode

MSC2000:

O641

WEI Chuan-Dong, GE Guo-Ping, LI Chun-Yan, LEI Ke-Wei, LIANG Hong-Ze, YU Gang, LIU Zhi-Wei. Crystal Structure and Photophysical Properties of an Iridium(Ⅲ) Pyrazine Complex[J].Acta Phys. -Chim. Sin., 2015, 31(1): 17-22.

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Crystal Structure and Photophysical Properties of an Iridium(Ⅲ) Pyrazine Complex

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