Urea-formaldehyde resin room temperature phosphorescent material with ultra-long afterglow and adjustable phosphorescence performance

Wensheng Xu, Bowei Wang (), Shuai Liu, Wangwang Fang, Qinglong Jia, Jiayi Liu, Changchang Bo, Xilong Yan, Yang Li and Ligong Chen ()
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Wensheng Xu: Tianjin University
Bowei Wang: Tianjin University
Shuai Liu: Shaoxing Xingxin New Materials Co., Ltd
Wangwang Fang: Tianjin University
Qinglong Jia: Tianjin University
Jiayi Liu: Tianjin University
Changchang Bo: Tianjin University
Xilong Yan: Tianjin University
Yang Li: Tianjin University
Ligong Chen: Tianjin University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Organic room-temperature phosphorescence materials have attracted extensive attention, but their development is limited by the stability and processibility. Herein, based on the on-line derivatization strategy, we report the urea-formaldehyde room-temperature phosphorescence materials which are constructed by polycondensation of aromatic diamines with urea and formaldehyde. Excitingly, urea-formaldehyde room-temperature phosphorescence materials achieve phosphor lifetime up to 3326 ms. There may be two ways to enhance phosphorescence performance, one is that the polycondensation of aromatic diamine with urea and formaldehyde promotes spin-orbit coupling, and another is that the imidazole derivatives derived from the condensation of aromatic o-diamine with formaldehyde maintains low levels of energy level difference and spin-orbit coupling, thus achieving ultra-long afterglow. Surprisingly, urea-formaldehyde room-temperature phosphorescence materials exhibit tunable phosphorescence emission in electrostatic field. Accordingly, 1,4-phenylenediamine, urea, and formaldehyde are copolymerized and self-assembled into phosphorescence microspheres with different electrostatic potential strengths. By mixing 1 wt% 1,4-phenylenediamine polycondensation microspheres with 1,4-phenylenediamine free microspheres, phosphor lifetime of the composite could be regulated from 27 ms to 123 ms. Moreover, vulcanization process enables precise shaping of urea-formaldehyde room-temperature phosphorescence materials. This work not only demonstrates that urea-formaldehyde room-temperature phosphorescence materials are promising candidates for organic phosphors, but also exhibits the phenomenon of electrostatically regulated phosphorescence.

Date: 2024
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DOI: 10.1038/s41467-024-48744-w

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