Triplet-Polaron-Interaction-Induced Upconversion from Triplet to Singlet: a Possible Way to Obtain Highly Efficient OLEDs

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• 作者：Ablikim Obolda ; Qiming Peng ; Chuanyou He ; Tian Zhang ; Jiajun Ren ; Hongwei Ma ; Zhigang Shuai and Feng Li
• 刊名：Advanced Materials
• 出版年：2016
• 出版时间：June 15, 2016
• 年：2016
• 卷：28
• 期：23
• 页码：4740-4746
• 全文大小：1073K
• ISSN：1521-4095

文摘

Two D–A-type molecules, 4-N-[4-(9-phenylcarbazole)]-3,5-bis(4-diphenylamine)phenyl-4H-1,2,4-triazole and 4,4′-(9-(4-(1-phenyl-1H-phenanthro[9,10-d]imidazol-2-yl)phenyl)-9H-carbazole-3,6-diyl) bis-(N,N-diphenylaniline), are designed and synthesized. Organic lightemitting diodes based on them exhibit deep-blue emission and the singlet formation ratios are higher than the simple spin-statistics of 25%. A triplet-polaroninteraction-induced upconversion from triplet to singlet through a one-electron transfer mechanism is proposed, and is proven by magnetocurrent measurement and quantum-chemistry computation.