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作 者:曾国庆[1] 林慧[1] 张磊[1] 张伟[1] 于军胜[1]
机构地区:[1]电子科技大学光电信息学院显示科学与技术四川省重点实验室,四川成都610054
出 处:《压电与声光》2013年第2期250-254,共5页Piezoelectrics & Acoustooptics
基 金:国家自然基金创新群体基金资助项目(61021061);国家自然科学基金资助项目(61177032);教育部博士点基金资助项目(20090185110020);教育部留学归国基金资助项目(GGRYJJ08-05);中央高校基本科研业务费专项经费基金资助项目(ZYGX2010Z004;ZYGX2009J054;ZYGX2010J004)
摘 要:采用蓝色磷光染料bis[(4,6-diflourophenyl)-pyridinato-N,C2’)](picolinato)Iridium(III)(FIrpic)和黄色磷光染料bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2,]iridium(acetylacetonate)[(t-bt)2Ir(acac)]为超薄层,制备了结构为ITO/NPB/mCP/(t-bt)2Ir(acac)/mCP/FIrpic/mCP/TPBi/Mg∶Ag的白色有机电致发光器件。通过调节磷光染料双超薄层FIrpic和(t-bt)2Ir(acac)的厚度,优化了白光器件的性能。结果表明,白光器件的最高电流效率为13.08cd/A,最高功率效率为7.21lm/W,发光光谱稳定,在9V时得到色坐标为(0.33,0.33)的标准白光,并且在较宽的电压范围内仅有(±0.08,±0.08)变化。这是由于超薄层FIrpic和(t-bt)2Ir(acac)形成的陷阱效应直接俘获电子和空穴,从而将载流子复合区域限制在一定范围内,不仅有利于增加激子的辐射发光效率,且提高了光谱的稳定性。The white organic light-emitting devices (OLEDs) with a structure of ITO/NPB/mCP/(t-bt)2Ir (acac)/mCP/FIrpic/mCP/TPBi/Mg : Ag were fabricated using a blue and yellow phosphorescent dyes of bis[(4,6- diflourophenyl)-pyridinato-N,C2')](picolinato) Iridium(III) (FIrpic) and bis[2-(4-tertbutylphenyl)benzothiazola- to-N, C2, ]iridium (acetylacetonate) [ (t-bt) 2 Ir (acac) ] as ultrathin layers, respectively. The performance of white OLEDs has been optimized by adjusting the film thickness of (t-bt)2Ir(acac) and Firpic. The results showed that a pure white organic light-emission was obtained with a current efficiency of 13.08 cd/A and a power efficiency of 7.21 lm/W. The CIE (Commissions Internationale De L'Eclairage) coordinates near (0.33,0.33) was observed at 9 V with a slight variation of (±0.08, ±0.08) in a wide range of voltages. The high power efficiency and stable electroluminescence were attributed to the confining emission zone function of direct carrier trapping in the ultrathin layers.
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