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首页> 外文期刊>RSC Advances >Low efficiency roll-off and high performance OLEDs employing alkyl group modified iridium(III) complexes as emitters
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Low efficiency roll-off and high performance OLEDs employing alkyl group modified iridium(III) complexes as emitters

机译：使用烷基改性铱（III）配合物作为发射器的低效滚降和高效OLED

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摘要

Significant efficiency roll-off of phosphorescent organic light-emitting diodes (PHOLEDs) is a long-standing issue that limits their wider application. To address this problem, four iridium(III) complexes modified by methyl or tert-butyl groups were designed and synthesized, denoted as Me-Ir-PI, tBu-Ir-PI, Me-Ir-PB, and tBu-Ir-PB. Their photophysical, electrochemical, and electroluminescent properties were studied in detail. The electroluminescent performances of devices based on tBu-Ir-PI and tBu-Ir-PB were better than those based on Me-Ir-PI and Me-Ir-PB. The best performance was achieved by the doped device employing tBu-Ir-PI as the emitter with maximum current efficiency of 42.0 cd A(-1) and maximum power efficiency of 27.0 lm W (1). Even at a practical brightness of 1000 cd m (2), the current efficiency and power efficiency remained as high as 39.2 cd A(-1) and 22.3 lm W-1. Notably, all doped devices exhibited low efficiency roll-off, especially for device incorporation of tBu-Ir-PB as the guest emitter, which had extremely low roll-off of 0.9%. Meanwhile, non-doped devices based on these iridium(III) complexes also displayed good EL performances.
机译：磷光有机发光二极管（Pholeds）的显着效率滚动是一个长期存在的问题，限制了他们更广泛的应用。为了解决这个问题，设计并合成了由甲基或叔丁基改性的四个铱（III）复合物，表示为ME-IR-PI，TBU-IR-PI，ME-IR-IR-PB和TBU-IR-PB 。详细研究了它们的光药，电化学和电致发光性。基于TBU-IR-PI和TBU-IR-PB的器件的电致发光性能优于基于ME-IR-PI和ME-IR-PB的装置。采用TBU-IR-PI的掺杂器件实现了最佳性能，作为发射器，最大电流效率为42.0cd a（-1），最大功率为27.0 lm w（1）。即使在1000cd m（2）的实际亮度下，电流效率和功率效率也保持高达39.2 CD A（-1）和22.3 LM W-1。值得注意的是，所有掺杂器件都表现出低效率的滚动，特别是对于将TBU-IR-PB的器件掺入作为访客发射器，其具有0.9％的极低滚动。同时，基于这些铱星（III）复合物的非掺杂器件也显示出良好的EL表演。

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  • 来源
    《RSC Advances》 |2016年第112期|共8页
  • 作者

    Wen Li-Li; Yu Jing; Sun Hai-Zhu; Shan Guo-Gang; Xie Wen-Fa; Su Zhong-Min;

  • 作者单位

    Northeast Normal Univ Fac Chem Inst Funct Mat Chem Natl &

    Local United Engn Lab Power Battery Changchun 130024 Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Jilin Peoples R China;

    Northeast Normal Univ Fac Chem Inst Funct Mat Chem Natl &

    Local United Engn Lab Power Battery Changchun 130024 Peoples R China;

    Northeast Normal Univ Fac Chem Inst Funct Mat Chem Natl &

    Local United Engn Lab Power Battery Changchun 130024 Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Jilin Peoples R China;

    Northeast Normal Univ Fac Chem Inst Funct Mat Chem Natl &

    Local United Engn Lab Power Battery Changchun 130024 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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