A novel blue-emitting Ir(III) complex with short excited state lifetime: Synthesis, structure, photophysical property, and electrophosphorescence performance

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• 作者：Yangqing Zhang^a ; ^b ; ^{zhangyangqing01@163.com} ; Mingjing Song^c ; Laiqiang Huang^a ; ^b ;
• 关键词：Iridium complex ; Blue-emitting ; Photoluminescence ; Electrophosphorescence
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：September, 2012
• 卷：132
• 期：9
• 页码：2242-2246
• 文件大小：520 K

摘要

In this paper, we synthesize a triphenylamine-derived cyclometalating ligand of (4-benzothiazol-2-yl-phenyl)-diphenyl-amine (referred as BPDA) and its corresponding Ir(III) complex of (BPDA)₂Ir(acac) (acac=acetylacetone). The photophysical property, molecular structure, thermal property and electroluminescence performance of (BPDA)₂Ir(acac) are investigated in detail. It is found that (BPDA)₂Ir(acac) is an efficient emitter with high thermal stability and short excited state lifetime. The emission of (BPDA)₂Ir(acac) changes from deep blue (417 nm) to bluish green (500 nm) upon addition of different solvents. We also investigate its electrophosphorescence performance. A maximum electroluminance of 8820 cd/m² peaking at 494 nm is achieved, with the highest device efficiency of 1.72 cd/A.