Thermally Activated Delayed Fluorescence Materials Based on Homoconjugation Effect of Donor鈥揂cceptor Triptycenes

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• 作者：Katsuaki Kawasumi ; Tony Wu ; Tianyu Zhu ; Hyun Sik Chae ; Troy Van Voorhis ; Marc A. Baldo ; Timothy M. Swager
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：September 23, 2015
• 年：2015
• 卷：137
• 期：37
• 页码：11908-11911
• 全文大小：301K
• ISSN：1520-5126

文摘

Donor鈥揳cceptor triptycences, TPA-QNX(CN)2 and TPA-PRZ(CN)2, were synthesized and their emissive properties were studied. They exhibited a blue-green fluorescence with emission lifetimes on the order of a microsecond in cyclohexane at room temperature. The long lifetime emission is quenched by O₂ and is attributed to thermally activated delayed florescence (TADF). Unimolecular TADF is made possible by the separation and weak coupling due to homoconjugation of the HOMO and LUMO on different arms of the three-dimensional donor鈥揳cceptor triptycene. Organic light emitting devices (OLEDs) were fabricated using TPA-QNX(CN)2 and TPA-PRZ(CN)2 as emitters which displayed electroluminescence with efficiencies as high as 9.4% EQE.