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Title: Large-area, flexible, transparent, and long-lived polymer-based phosphorescence films
Authors: Zhang, Yongfeng
Su, Yan
Wu, Hongwei
Wang, Zhonghao
Wang, Chang
Zheng, Yan
Zheng, Xian
Gao, Liang
Zhou, Qian
Yang, Yan
Chen, Xiaohong
Yang, Chaolong
Zhao, Yanli
Keywords: Science::Chemistry
Issue Date: 2021
Source: Zhang, Y., Su, Y., Wu, H., Wang, Z., Wang, C., Zheng, Y., Zheng, X., Gao, L., Zhou, Q., Yang, Y., Chen, X., Yang, C. & Zhao, Y. (2021). Large-area, flexible, transparent, and long-lived polymer-based phosphorescence films. Journal of the American Chemical Society, 143(34), 13675-13685.
Project: RT12/19
Journal: Journal of the American Chemical Society
Abstract: 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 materials is challenging because of difficulties in populating and stabilizing susceptible triplet excited states at room temperature. Herein large-area, flexible, transparent, and long-lived RTP systems prepared by doping rationally selected organic chromophores in a poly(vinyl alcohol) (PVA) matrix were realized through a hydrogen-bonding and coassembly strategy. In particular, the 3,6-diphenyl-9H-carbazole (DPCz)-doped PVA film shows long-lived phosphorescence emission (up to 2044.86 ms) and a remarkable duration of afterglow (over 20 s) under ambient conditions. Meanwhile, the 7H-dibenzo[c,g]carbazole (DBCz)-doped PVA film exhibits high absolute luminance of 158.4 mcd m2 after the ultraviolet excitation source is removed. The RTP results not only from suppressing the nonradiative decay by abundant hydrogen-bonding interactions in the PVA matrix but also from minimizing the energy gap (ΔEST) between the singlet state and the triplet state through the coassembly effect. On account of the outstanding mechanical properties and the afterglow performance of these RTP materials, they were applied in the fabrication of flexible 3D objects with repeatable folding and curling properties. Importantly, the multichannel afterglow light-emitting diode arrays were established under ambient conditions. The present long-lived phosphorescent systems demonstrate a bright opportunity for the production of large-area, flexible, and transparent emitting materials.
ISSN: 0002-7863
DOI: 10.1021/jacs.1c05213
Rights: © 2021 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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