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Improvement on the performance of electrophosphorescent organic light-emitting device employing n-doped bis-4,6-(3,5-di-3-pyridylphenyl)-2-methylpyrimi-dine as electron-transporting layer
Organic Electronics ( IF 3.2 ) Pub Date : 2018-06-22 , DOI: 10.1016/j.orgel.2018.06.030
Zhijun Wu , Yaoyao Yu , Ye Yu , Wenyan Lin , Yu Jin , Xiaoyan Li , Xining Zhang , Huishan Yang

The effects of using Cesium azide as an n-dopant in Bis-4,6-(3,5-di-3-pyridylphenyl)-2-methylpyrimi-dine on the performances of green phosphorescent organic light-emitting device had been studied in detail for the first time. By optimizing the device structure, phosphorescent organic light-emitting device having a maximum current efficiency of 76.4 cd/A and a maximum external quantum efficiency of 21.7% was realized. In particular, the maximum power efficiency and the power efficiency at 100 cd/m2 were as high as 99.9lm/W and 99.4lm/W, respectively, which were better than the parameter on power efficiency of most reported Ir (ppy)3-OLEDs without out-coupling enhancement. Origins of the improvement on device characteristics in the n-doped device were systematically investigated by experimental and theoretical methods and the role of Cesium azide in enhancing the electron conductivity of the n-doped electron-transporting layer was discovered by X-ray photoelectron spectroscopy measurement.



中文翻译:

以n掺杂的双-4,6-(3,5-二-3-吡啶基苯基)-2-甲基嘧啶为电子传输层的电致磷光有机发光器件的性能改进

在Bis-4,6-(3,5-di-3-pyridylphenyl)-2-methylpyrimi-dine中研究了叠氮化铯作为正掺杂剂对绿色磷光有机发光器件性能的影响。第一次的细节。通过优化器件结构,实现了具有76.4cd / A的最大电流效率和21.7%的最大外部量子效率的磷光有机发光器件。特别是,最大功率效率和在100 cd / m 2时的功率效率分别高达99.9lm / W和99.4lm / W,优于大多数报道的Ir(ppy)3的功率效率参数。-没有外耦合增强的OLED。通过实验和理论方法系统地研究了改善n掺杂器件的器件特性的起源,并通过X射线光电子能谱测量发现了叠氮化铯在增强n掺杂电子传输层的电子电导率中的作用。 。

更新日期:2018-06-22
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