Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes

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• 作者：Qisheng Zhang ; Jie Li ; Katsuyuki Shizu ; Shuping Huang ; Shuzo Hirata ; Hiroshi Miyazaki ; Chihaya Adachi
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：September 12, 2012
• 年：2012
• 卷：134
• 期：36
• 页码：14706-14709
• 全文大小：256K
• 年卷期：v.134,no.36(September 12, 2012)
• ISSN：1520-5126

文摘

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蟺蟺* states are close to or higher than the triplet intramolecular charge transfer (³CT) state, control of the 蟺-conjugation length of both donor and acceptor is considered to be as important as breaking the 蟺-conjugation between them in blue TADF material design.