Novel Ambipolar Orthogonal Donor鈥揂cceptor Host for Blue Organic Light Emitting Diodes

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• 作者：Man-kit Leung ; Yu-Hsuan Hsieh ; Ting-Yi Kuo ; Pi-Tai Chou ; Jiun-Haw Lee ; Tien-Lung Chiu ; Hsin-Jen Chen
• 刊名：Organic Letters
• 出版年：2013
• 出版时间：September 20, 2013
• 年：2013
• 卷：15
• 期：18
• 页码：4694-4697
• 全文大小：285K
• 年卷期：v.15,no.18(September 20, 2013)
• ISSN：1523-7052

文摘

Ambipolar triplet hosts comprising 1,2,4-triazole and carbazole in ortho-positions have been developed. The blue PHOLED has a high current efficiency of 47.1 cd A^鈥?, power efficiency of 41.2 lm W^鈥?, and low efficiency roll-off. The high efficiency was attributed to the successful control of 蟺-conjugation through orthogonal arrangement of the substituents so that a wide T₁鈥揝₀ gap could be maintained.