Synthesis of bicyclometalated iridium complex containing 1,3,4-oxadiazole-based picolinic acid derivative and its optoelectronic properties in polymer light-emitting devices

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• 作者：Fangliang Xiao ; Yu Liu ; Zhengyong Hu ; Quan Gan ; Lei Wang ; Zhonglin Wen ; Meixiang Zhu ; Weiguo Zhu
• 关键词：Iridium complex ; 1 ; 3 ; 4-Oxadiazole ; Polymer light-emitting device ; Photoluminescence ; Electrophosphorescence
• 刊名：Synthetic Metals
• 出版年：2009
• 出版时间：July 2009
• 年：2009
• 卷：159
• 期：13
• 页码：1308-1312
• 全文大小：246 K

文摘

A picolinic acid derivative bearing an 1,3,4-oxadiazole unit and its bicyclometalated iridium complex (PhOXD)₂Ir(BuPhOXD-Pic) were synthesized and characterized, in which BuPhOXD-Pic is 5-(4′-(5″-(4-tert-butylphenyl)-1″,3″,4″-oxadiazol-2″-yl) phenyl) picolinic acid and PhOXD is 2,5-diphenyl-1,3,4-oxadiazole. The optoelectronic properties of this iridium complex were studied in the double-layer polymer light-emitting devices using a blend of poly (9,9-dioctylfluorene) and 5-biphenyl-2-(4-tert-butyl) phenyl-1,3,4-oxadiazole as a host matrix. This complex exhibited a maximum luminance efficiency of 7.7 cd/A at 5.6 mA/cm² and a peak brightness of 5288 cd/m² at 153.7 mA/cm² in the devices. Compared to the (PhOXD)₂Ir(Pic) complex, the (PhOXD)₂Ir(BuPhOXD-Pic) complex displays better optoelectronic properties in the devices. This study provides a convenient way to improve the optoelectronic properties of iridium complexes by modifying an ancillary ligand of picolinic acid (Pic) with an 1,3,4-oxadiazole unit.