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Emission mechanism in organic light-emitting devices comprising a europium complex as emitter and an electron transporting material as host

机译：包含complex配合物作为发射体和电子传输材料作为主体的有机发光装置中的发射机理

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摘要

The emission mechanism in organic light-emitting devices, where the emission layer is composed of Eu(DBM)_3pyzphen (DBM = Dibenzoylmethane, pyzphen=pyrazino-[2,3-f][1,10]-phenanthro-line) doped into electron transporting/hole blocking material BPhen (4,7-diphenyl-1, 10-phenanthroline), is investigated. Energy transfer and carrier trapping simultaneously exist in the luminescence process, and carrier trapping is a main process. Direct carrier trapping by Eu(DBM)_3pyzphen molecules is confirmed by the difference of electroluminescence and photoluminescence spectra as well as J-V characteristics. Efficient Foester and Dexter energy transfer from BPhen to Eu(DBM)_3pyzphen molecules were speculated in terms of analysis of photoluminescence spectra of fixed solutions, triplet energies, and phosphorescent lifetimes. Based on these mechanisms, the overall performances of these devices were improved. High efficiencies were obtained under carrier trapping by Eu(DBM)_3pyzphen molecules, and the emission of BPhen was eliminated by efficient energy transfer from the BPhen to Eu(DBM)_3pyzphen molecules.
机译：发光层由掺杂到Eu（DBM）_3pyzphen（DBM =二苯甲酰甲烷，pyzphen = pyrazino- [2,3-f] [1,10]-菲咯啉线）组成的有机发光器件中的发光机理研究了电子传输/空穴阻挡材料BPhen（4,7-diphenyl-1，10-phenothroline）。发光过程中同时存在能量转移和载流子俘获，载流子俘获是主要过程。 Eu（DBM）_3pyzphen分子的直接载流子俘获通过电致发光和光致发光光谱的差异以及J-V特性得到证实。通过分析固定溶液的光致发光光谱，三重态能量和磷光寿命，推测了从BPhen到Eu（DBM）_3pyzphen分子的有效Foester和Dexter能量转移。基于这些机制，这些设备的整体性能得到了改善。 Eu（DBM）_3pyzphen分子在载流子俘获下获得了高效率，并且通过从BPhen到Eu（DBM）_3pyzphen分子的有效能量转移消除了BPhen的发射。

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  • 来源
    《Journal of Applied Physics》 |2007年第4期|p.044512.1-044512.6|共6页
  • 作者

    Q. Xin; W. L. Li; W. M. Su; T. L. Li; Z. S. Su; B. Chu; B. Li;

  • 作者单位

    Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用物理学;计量学;
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