High-Efficiency Phosphorescent Hybrid Organic鈥揑norganic Light-Emitting Diodes Using a Solution-Processed Small-Molecule Emissive Layer

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• 作者：Changjun Fan ; Yong Lei ; Zhen Liu ; Ruixue Wang ; Yanlian Lei ; Guoqing Li ; Zuhong Xiong ; Xiaohui Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 23, 2015
• 年：2015
• 卷：7
• 期：37
• 页码：20769-20778
• 全文大小：542K
• ISSN：1944-8252

文摘

The morphology and optical and electrical properties of solution-processed and vacuum-deposited 4,4鈥?4鈥?tris(carbazol-9-yl)triphenylamine (TCTA):2,2鈥?(1,3-phenylene)bis[5-(4-tert-butylphenyl)-1,3,4-oxadiazole] (OXD-7) composite films are investigated. All of the films exhibit smooth and pinhole-free morphology, while the evaporated films possess enhanced carrier-transport properties compared to solution-processed ones. The close correlation between the carrier-transport feature and the packing density of the film is established. High-efficiency monochromatic and white phosphorescent hybrid organic鈥搃norganic light-emitting diodes with solution-processed small-molecule emissive layers are reported: the maximum external quantum efficiencies of blue, yellow, and red devices are 18.9, 14.6, and 10.2%, respectively; white devices show a maximum luminance efficiency of 40 cd A^鈥? and a power efficiency of 20.8 lm W^鈥? at 1000 cd m^鈥?. The efficiencies of blue, red, and white devices represent significant improvement over previously reported values.