High-performance polymer light-emitting diodes doped with a red phosphorescent iridium complex
High-performance polymer light-emitting diodes doped with a red phosphorescent iridium complex
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DOI：
10.1063/1.1462862
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发表时间：
2002-04-01
影响因子：
4
通讯作者：
Kido, J
中科院分区：
文献类型：
--
作者：
Chen, FC;Yang, Y;Kido, J
通过将荧光主体材料聚(乙烯基咔唑)(PVK)与Ir(III)配合物双[2-(2(‘)-苯并硫基)-吡啶-N，C-3’]Ir(乙酰丙酮)(BtpIr)掺杂，实现了高效率的红色发光聚合物发光二极管(PLED)。电致发光光谱的最大波长为614 nm。最高外量子效率为3.3%。与铂(II)-2，8，12，17-四乙基-3，7，13，18-四甲基卟啉掺杂的PVK PLEDs相比，BtpIr掺杂的PVK PLEDs中三重态激子的猝灭被抑制。在高电流密度和1350cd/m2的极高亮度下，可以保持65%的峰值效率。我们认为，三重态-三重态湮灭和极化子-三重态湮灭都涉及激子猝灭。(C)2002年美国物理研究所。
High efficiency has been achieved in polymer light-emitting diodes (PLEDs) exhibiting red emission by doping a fluorescence host material, poly(vinylcarbazole) (PVK), with an iridium(III) complex, bis[2-(2(')-benzothienyl)-pyridinato-N,C-3']iridium(acetylacetonate) (BtpIr). The electroluminescence spectrum has a maximum wavelength of 614 nm. The highest external quantum efficiency is 3.3%. Due to its short triplet excited lifetime (similar to5 mus), the quenching of the triplet exciton in BtpIr-doped PVK PLEDs has been shown to be suppressed compared to platinum(II)-2,8,12,17-tetraethyl- 3,7,13,18-tetramethylporphyrin-doped PVK PLEDs. 65% of the peak efficiency can be sustained at high-current density and at the very high brightness of 1350 cd/m2. We suggest that both triplet-triplet annihilation and polaron-triplet annihilation involves exciton quenching. (C) 2002 American Institute of Physics.