Spectroscopic Observation of Triplet Exciton Dynamics during Operation in Polymer Light Emitting Diodes
Spectroscopic Observation of Triplet Exciton Dynamics during Operation in Polymer Light Emitting Diodes
复制标题
聚合物发光二极管工作过程中三重态激子动力学的光谱观察
DOI：
10.1080/15421406.2015.1095834
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发表时间：
2016
影响因子：
0.7
通讯作者：
Katsuichi Kanemoto
中科院分区：
文献类型：
--
作者：
Takahiro Takahashi;Katsuichi Kanemoto
在典型的荧光有机发光二极管（LED）中，由于三重态激子的非辐射衰变特征，观察它们是困难的。采用光谱技术结合LED操作成功地监测了三重态激子的产生过程。单重态激子的生成动力学，然后同时检查时间分辨的电致发光测量，使单重态和三重态激子的生成过程的相对比较。其结果是，单重态激子的产生率被示出通过施加电压而增强。这种增强是由于电场诱导的单态激子产生速率的增加。
In typical fluorescent organic light emitting diodes (LEDs), the observation of triplet excitons is difficult because of their non-radiative features of decay. The generation process of triplet excitons was successfully monitored by employing spectroscopic techniques combined with LED operation. The generation dynamics of singlet excitons are then simultaneously examined by time-resolved electroluminescence measurements, enabling relative comparison of the generation processes of singlet and triplet excitons. As a result, the generation ratio of singlet excitons is shown to be enhanced by applied voltage. The enhancement is concluded to result from the increase of the generation rate in signlet excitons induced by electric field.