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Self‐Stabilized Amorphous Organic Materials with Room‐Temperature Phosphorescence
Author(s) -
Xu Wei,
Yu Yaguo,
Ji Xiaonan,
Zhao Huarui,
Chen Jinming,
Fu Yanyan,
Cao Huimin,
He Qingguo,
Cheng Jiangong
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201906881
Subject(s) - phosphorescence , amorphous solid , crystallization , photochemistry , chemistry , materials science , chemical engineering , organic chemistry , fluorescence , physics , engineering , quantum mechanics
The stability of pure organic room‐temperature phosphorescent (RTP) materials in air has been a research hotspot in recent years. Without crystallization or encapsulation, a new strategy was proposed to obtain self‐stabilized organic RTP materials, based on a complete ionization of a photo‐induced charge separation system. The ionization of aromatic phenol 4‐carbazolyl salicylaldehyde (CSA) formed a stable H‐bonding anion–cation radical structure and led to the completely amorphous CSA‐I film. Phosphorescent lifetimes as long as 0.14 s at room temperature and with direct exposure to air were observed. The emission intensity was also increased by 21.5‐fold. Such an amorphous RTP material reconciled the contradiction between phosphorescence stability and vapor permeability and has been successfully utilized for peroxide vapor detection.