High-efficiency red electroluminescence from europium complex containing a neutral dipyrido(3,2-a:2鈥?3鈥?c)phenazine ligand in PLEDs

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• 作者：Yu Liu^a ; Yafei Wang^a ; Juan He^a ; Qingqing Mei^a ; Kai Chen^a ; Jiaojiao Cui^a ; Chun Li^b ; Meixiang Zhu^a ; Junbiao Peng^b ; Weiguo Zhu^a ; ^{zhuwg18@126.com} ; Yong Cao^b ; ^{yongcao@scut.edu.cn}
• 关键词：Europium(III) complex ; Optophysical properties ; Electroluminescence ; Polymer light-emitting devices
• 刊名：Organic Electronics
• 出版年：2012
• 期刊代码：137_15661199
• 类别：et
• 出版时间：June, 2012
• 卷：13
• 期：6
• 页码：1038-1043
• 文件大小：665 K

摘要

In order to obtain high-efficiency monochromatic red emission in polymer light-emitting devices, a tris(dibenzoylmethanato)(dipyrido(3,2-a:2鈥?3鈥?c)phenazine) europium [Eu(DBM)₃(DPPZ)] doped single-emissive-layer devices were fabricated using a blend of poly(9,9-dioctyl-fluorence) and 2-tert-butyl-phenyl-5-biphenyl-1,3,4-oxadiazole as a host matrix by solution process. Significantly improved electro-luminescent properties with sharp red emission at 611.5 nm were displayed in the Eu(DBM)₃(DPPZ)-doped devices at dopant concentrations from 1 to 8 wt.%. The highest luminance up to 1783 cd/m² at 2 wt.%dopant concentration, as well as the maximum external quantum efficiency of 2.5%and current efficiency of 3.8 cd/A were obtained at 1 wt.%dopant concentration.