Synthesis and optoelectronic properties of a novel dinuclear cyclometalated platinum(II) complex containing triphenylamine-substituted indolo[3,2-b]carbazole derivative in聽the聽single-emissive-layer WPLEDs

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• 作者：Junting Yu ; Jian Luo ; Qing Chen ; Keqi He ; Fanyuan Meng ; Xianping Deng ; Yafei Wang ; Hua Tan ; Haigang Jiang ; Weiguo Zhu
• 关键词：Dinuclear platinum complex ; White polymer light-emitting devices ; Indolo[3 ; 2-b]carbazole ; Electrophosphorescence ; Aggregation emission
• 刊名：Tetrahedron
• 出版年：11 February, 2014
• 年：2014
• 卷：70
• 期：6
• 页码：1246-1251
• 全文大小：1211 K

文摘

A novel bi-picolinic acid derivative of H₂dipic-BTICz containing binary triphenylamine-substituted indolo[3,2-b]carbazole (BTICz) unit and its dinuclear platinum(II) complex of (dfppy)₂Pt₂(dipic-BTICz) were synthesized as a single-component emitter used in the white polymer light-emitting diodes (WPLEDs), where dfppy is 2-(2,4-difluorophenyl)pyridine and dipic-BTICz is an anion of H₂dipic-BTICz. The photophysical and electrochemical properties of (dfppy)₂Pt₂(dipic-BTICz) were investigated. Compared with the reported mononuclear platinum complex of (dfppy)Pt(pic), (dfppy)₂Pt₂(dipic-BTICz) exhibited a red-shifted photoluminescent peak at 434聽nm in dilute dichloromethane (10^鈭?聽M), but a weakened and red-shifted aggregation emission peak at 640聽nm besides its intrinsic emission at 445聽nm in its neat films. Stable pure white emissions with CIE coordinates of (0.325卤0.005, 0.345卤0.015) and a maximum brightness of 208聽cd/m² were observed in the (dfppy)₂Pt₂(dipic-BTICz)-doped single-emissive-layer (SEL) PLEDs using a blend of poly(vinylcarbazole) and 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole as a host matrix at 1聽wt聽% dopant concentrations under applied voltages from 9聽to 14聽V. It indicates that the intrinsic and aggregation emissions of this dinuclear platinum complex were effectively tuned by inserting a new BTICz fluorophore in the dual picolinic acid derivative. Therefore, it is a promising single-component emitter to get white emission in SEL PLEDs.