Highly efficient white fluorescence/phosphorescence hybrid organic light emitting devices based on an efficient hole-transporting blue emitter

• DOI: 10.1016/j.dyepig.2014.12.024
• Publication Date: 2015-01-06T12:39:14Z
• Authors: Xiaoyang Du; Yun Huang; Silu Tao; Xiaoxia Yang; Xulin Ding; Xiaohong Zhang
• Keywords: Deep blue

Abstract 4,4'-di-(1-pyrenyl)-4''-[2-(9,9'-dimethylfluorene)]triphenylamine was proved to be a hole-transporting blue emitter with a hole-mobility of 6.40 × 10 −5 cm 2 V −1 s −1 . A blue organic light emitting device using the compound as a fluorescent dopant shows a maximum luminance efficiency of 5.8 cd A −1 (5.2 lm W −1 , 4.5%) with Commission Internationale de L'Eclairage coordinates of x = 0.16, y = 0.18. Fluorescence/phosphorescence hybrid white device employed the compound and Ir(2-phq) 3 respectively as blue and orange emitter has been fabricated, which shows a warm white emission with a maximum efficiency of 16.8 cd A −1 (16.1 lm W −1 ). Moreover, high efficiency three-color fluorescence/phosphorescence hybrid white organic light emitting device using the compound as blue fluorescent emitter combining with phosphorescent yellowish-green emitter (Ir(ppy) 2 bop) and red emitter (Ir(piq) 3 ) has been achieved. The white device shows a maximum efficiency of 42.5 cd A −1 (38.2 lm W −1 , 15.5%), with a Color-Rendering Index of 76, which is among the best results for previously reported fluorescence/phosphorescence white devices.