Large-Area, Flexible, Transparent, and Long-Lived Polymer-Based Phosphorescence Films

• DOI: 10.1021/jacs.1c05213
• Publication Date: 2021-08-19T18:14:42Z
• Authors: Yongfeng Zhang; Yan Su; Hongwei Wu; Zhonghao Wang; Chang Wang; Yan Zheng; Xian Zheng; Liang Gao; Qian Zhou; Yan Yang; Xiaohong Chen; Chaolong Yang; Yanli Zhao
• Keywords: Carbazole

Polymer-based room-temperature phosphorescence (RTP) materials with high flexibility and large-area producibility are highly promising for applications in organic electronics. However, achieving such photophysical is challenging because of difficulties populating stabilizing susceptible triplet excited states at room temperature. Herein large-area, flexible, transparent, long-lived RTP systems prepared by doping rationally selected chromophores a poly(vinyl alcohol) (PVA) matrix were realized through hydrogen-bonding coassembly strategy. In particular, the 3,6-diphenyl-9H-carbazole (DPCz)-doped PVA film shows emission (up to 2044.86 ms) remarkable duration afterglow (over 20 s) under ambient conditions. Meanwhile, 7H-dibenzo[c,g]carbazole (DBCz)-doped exhibits absolute luminance 158.4 mcd m2 after ultraviolet excitation source removed. The results not only from suppressing nonradiative decay abundant interactions but also minimizing energy gap (ΔEST) between singlet state effect. On account outstanding mechanical properties performance these materials, they applied fabrication flexible 3D objects repeatable folding curling properties. Importantly, multichannel light-emitting diode arrays established present phosphorescent demonstrate bright opportunity production transparent emitting materials.