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器件老化处理对有机发光磁效应的影响 被引量：1

Influence of aging treatment on magneto-electroluminescence in organic light emitting diodes
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摘要 制备了基于小分子tris-(8-hydroxyquinoline)aluminum(III)(Alq3)的有机发光二极管,并在室温下对器件进行大电流老化处理;然后测量了器件的光电性能,以及电致发光磁效应(magneto-electroluminescence,MEL)随老化时间的变化关系.实验结果显示,经老化处理后,器件的发光效率降低、工作电压增大;但器件的MEL随老化时间则表现出先增加、后减小的特点,且其线型保持不变.基于器件光电性能退化的主要机制,分析了器件MEL发生非单调变化的可能原因,即器件中形成了对发光激子有淬灭作用的Alq3阳离子,该阳离子引起发光强度的减弱造成MEL在短时间处理后增加,而阴极/Alq3界面的退化导致发光层中电场的增大则引起器件MEL的减小.这对理解有机发光的退化机制和有机磁效应的形成机制具有较好的促进作用. We investigated the influence of electric stress condition on organic magneto-electroluminescence（MEL） in tri-（8-hydroxyquinoline）aluminum（Alq3）-based organic light-emitting diodes.The results show that the performance of the devices goes to bad as increasing the aging time;in particular,the threshold voltage becomes larger and the luminescence efficiency gets lower.Moreover,the magnitude of the MEL increases firstly and then gets smaller with the line shape unchanged as the device aging.Possible explanations for the above effects were proposed based on the mechanism of the device aging.We suggested that the quencher,Alq3 cation-radicals,which formed in the emitting layer,reduce the EL intensity and enhance the magnitude of MEL.In addition,the increase in turn-on voltage and the decrease in MEL are assigned to the degradation at the interface of Al/Alq3.
作者 张巧明 雷衍连 陈丽佳 陈林 张勇 游胤涛 熊祖洪
机构地区 西南大学物理科学与技术学院发光与实时分析教育部重点实验室 复旦大学应用表面物理国家重点实验室
出处 《科学通报》 EI CAS CSCD 北大核心 2012年第13期1100-1105,共6页 Chinese Science Bulletin
基金 重庆市科委自然科学基金(2010BA6002) 复旦大学应用表面物理国家重点实验室开放课题(KL2011_06) 国家自然科学基金(10974157) 中央高校基本科研业务费专项资金(XDJK2009A001 XDJK2011C041)资助
关键词 老化处理 有机磁效应 Alq3阳离子 界面退化 aging treatment organic magneto-electroluminescence Alq3 cation interface degradation
分类号 TN312.8 [电子电信—物理电子学]
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参考文献14

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同被引文献46

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二级引证文献1

  • 1陈忠宁.编者按[J].科学通报,2014,59(17):1581-1581.
科学通报
2012年 第13期

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