A novel fluorinated europium ternary complex for highly efficient pure red electroluminescence

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• 作者：Xiao Li ; Guoyong Xiao ; Haijun Chi ; Yan Dong ; Hongbin Zhao ; Peng Lei ; Zhiqiang Zhang ; Zhizhi Hu ; Shuanghong Wu ; Zisheng Su ; Wenlian Li
• 关键词：Optical materials ; Synthesis ; Luminescence ; Multilayers
• 刊名：Materials Chemistry and Physics
• 出版年：2010
• 出版时间：1 September 2010
• 年：2010
• 卷：123
• 期：1
• 页码：289-292
• 全文大小：464 K

文摘

A novel fluorine-functionalized europium(III) ternary complex, i.e., Eu(DBM)₃(BFPP), in which DBM was dibenzoylmethane and BFPP 2, 3-bis(4-fluorophenyl)pyrazino[2,3-f] [1,10]phenanthroline, was designed, synthesized and characterized. The complex emits the characteristic red emission of trivalent europium ion due to the ⁵D₀ → ⁷F_j (j = 0–4) transitions under photo excitation with good luminescent quantum efficiency (0.55) and exhibits high thermal stability (387 °C). The organic light-emitting diodes (OLEDs) employing the complex as a dopant emitter with the structures of ITO/TPD (40 nm)/CBP:Eu-complex (30 nm)/Bphen (10 nm)/Alq₃ (20 nm)/LiF (1 nm)/Al (150 nm) were successfully fabricated. The 4 wt. % Eu(DBM)₃(BFPP) doped device exhibited the maximum luminance of 1766 cd/m² and a peak current efficiency of 4.6 cd/A, corresponding to the high external quantum efficiency of 2.27 % .