Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes
Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes
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DOI：
10.1021/ja306538w
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发表时间：
2012-09-12
影响因子：
15
通讯作者：
Adachi, Chihaya
中科院分区：
文献类型：
--
作者：
Zhang, Qisheng;Li, Jie;Adachi, Chihaya
咔唑/砜衍生物在溶液和掺杂薄膜中均具有高效的热激活延迟荧光 (TADF)。基于该化合物的纯蓝色有机发光二极管 (OLED) 在低电流密度下表现出接近 10% 的极高外量子效率 (EQE)。由于 TADF 仅发生在以供体和受体为中心的 (3)pi pi* 态接近或高于三线态分子内电荷转移 (3CT) 态的双极体系中，因此在蓝色 TADF 材料设计中，控制供体和受体的 pi 共轭长度被认为与打破它们之间的 pi 共轭同样重要。
Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/sulfone derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered (3)pi pi* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the pi-conjugation length of both donor and acceptor is considered to be as important as breaking the pi-conjugation between them in blue TADF material design.