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作 者:高利岩[1] 赵谡玲[1] 徐征[1] 张福俊[1] 孙钦军[1] 张妍斐[1]
机构地区:[1]北京交通大学发光与光信息技术教育部重点实验室,光电子技术研究所,北京100044
出 处:《光谱学与光谱分析》2011年第9期2328-2331,共4页Spectroscopy and Spectral Analysis
基 金:国家自然科学基金项目(10974013,10804006,10774013);教育部博士点基金项目(20090009110027,20070004024);北京市自然科学基金项目(1102028);国家杰出青年科学基金项目(60825407);国家(973)项目(2010CB327705);优秀博士生科技创新基金项目(141106522)资助
摘 要:对蓝色磷光材料Ir(Fppy)3不同浓度掺杂PVK薄膜的光致发光(PL)和电致发光(EL)特性进行了研究。并制备了结构为ITO/PEDOT:PSS/PVK:Ir(Fppy)3/BCP/Alq3/LiF/Al的蓝色磷光有机电致发光器件。实验结果发现,磷光材料掺杂浓度不同,器件发光特性不同。当Ir(Fppy)3掺杂浓度比较低时,EL光谱中可以观察到PVK较弱的发光;当Ir(Fppy)3掺杂浓度较高时,会发生浓度猝灭;当Ir(Fppy)3掺杂浓度比较适中时,EL光谱中观察不到PVK的发光,只有Ir(Fppy)3的发光。通过I-V-L特性的比较,当掺杂浓度为4%时,器件的光电特性最好。In the present work, the photoluminescence (PL) and electroluminescence (EL) characteristics of TrisE2-(2,4-difluorophenyl) pyridine]iridium(Ⅲ) (Ir(Fppy)a) doped poly(n-vinylcarbazole) (PVK) with different doping concentrations were investigated. And a blue phosphorescent organic light-emitting diode (OLED) with the structures of ITO/PEDOT : PSS/PVK : Ir(Fppy)3/BCP/Alq3/LiF/At was fabricated. The experimental results show that the luminescence performances of devices are different as the doping concentration of Ir(Fppy)3 is different. When the doping concentration of Ir(Fppy)3 is lower, the lu- minescence of PVK can be found in EL spectra. When the doping concentration is too high, concentration quenching may occur. As the doping concentration is suitable, the luminescence of PVK can not be found, only the luminescence of Ir(Fppy)3 can he found in EL spectra. It is concluded that the device with doping concentration of 4% has the best photoelectric performance according to its current density-voltage-luminance curve.
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