Red polymer light-emitting devices based on an oxadiazole-functionalized europium(III) complex

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• 作者：Yu Liu ; Yafei Wang ; Chun Li ; Ying Huang ; Dongfeng Dang ; Meixiang Zhu ; Weiguo Zhu ; Yong Cao
• 关键词：Organometallic compounds ; Polymers ; Electrochemical properties ; Luminescence
• 刊名：Materials Chemistry and Physics
• 出版年：14 February, 2014
• 年：2014
• 卷：143
• 期：3
• 页码：1265-1270
• 全文大小：991 K

文摘

A novel tris(dibenzoylmethanato)[5-(2-(4-tert-butylbenzenyl)-5-benzenyl-1,3,4-oxadiazole-4鈥?-1,10-phenanthroline]europium(III) [Eu(DBM)₃(BuOXD-Phen)] containing an electron-transporting oxadiazole-functionalized phenanthroline ligand was synthesized and characterized. Its UV-vis absorption and photoluminescence (PL), as well as the electroluminescence (EL) in polymer light-emitting devices (PLEDs) were investigated. The double-layer PLEDs with a configuration of ITO/PEDOT:PSS (50聽nm)/PVK (40聽nm)/PFO:PBD (30%):Eu(DBM)₃(BuOXD-Phen) (1-8聽wt %) (80聽nm)/Ba (4聽nm)/Al (150聽nm) were fabricated. Saturated red Eu³⁺ ion emission, based on the ⁵D₀ 鈫?#xA0;⁷F₂ transition, is centered at a wavelength of 614聽nm with a full width at half maximum (FWHM) of 10聽nm. The highest external quantum efficiency (QE_ext) of 1.26% at current density of 1.65聽mA聽cm^鈭?, with a maximum brightness of 568聽cd聽m^鈭? at 137.8聽mA聽cm^鈭? was achieved from the device at 1聽wt % dopant concentration.