Effects of charge balance on device performances in deep blue phosphorescent organic light-emitting diodes
Effects of charge balance on device performances in deep blue phosphorescent organic light-emitting diodes
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DOI：
10.1016/j.orgel.2010.04.014
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发表时间：
2010-07
影响因子：
3.2
通讯作者：
Jonghee Lee;Jeong-Ik Lee;J. Lee;H. Chu
中科院分区：
文献类型：
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作者：
Jonghee Lee;Jeong-Ik Lee;J. Lee;H. Chu
通过改变混合主体发射层（EML）中主体材料的组合和组成，研究了深蓝色磷光有机发光二极管（PHOLED）的性能。电子传输型主体材料间-双-(三苯基甲硅烷基)苯(UGH3)与空穴传输型主体材料N,N'-二咔唑基-3,5-苯(mCP)或4,4',4''-三(N-咔唑基)三苯胺(TcTa)相结合，两者均掺杂有深蓝色 电致磷光掺杂剂双(4',6'-二氟苯基吡啶基)四(1-吡唑基)硼酸铱(III) (FIr6)。我们发现混合主体结构可以有效控制 EML 中载流子的注入和传输。因此，我们在深蓝色 PHOLED 中获得了显着提高的效率，峰值外部量子效率和亮度效率分别为 22.9% 和 39.2lm/W，同时保持国际照明委员会 (CIE) 坐标 (x=0.163，y=0.287)。
The performances of deep blue phosphorescent organic light-emitting diodes (PHOLEDs) have been investigated by changing the combination and the composition of host materials in a mixed host emissive layer (EML). An electron transport-type host material of m-bis-(triphenylsilyl)benzene (UGH3), was combined with an hole transport-type host materials, N,N′-dicarbazolyl-3,5-benzene (mCP) or 4,4′,4′′-tris(N-carbazolyl)triphenylamine (TcTa) both doped with a deep blue electro-phosphorescent dopant of iridium(III)bis(4′,6′-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate (FIr6). We found that a mixed host structure was effective to control the charge carrier injection and transport in EML. Therefore, we obtained highly improved efficiency in deep blue PHOLEDs with peak external quantum and luminance efficiencies of 22.9% and 39.2lm/W with maintaining Commission Internationale de L’Eclairage (CIE) coordinates of (x=0.163, y=0.287).