材料科学
荧光粉
磷光
聚丙烯腈
兴奋剂
无定形固体
聚合物
纳米技术
化学工程
光化学
光电子学
有机化学
复合材料
化学
光学
荧光
工程类
物理
作者
Hongzhuo Wu,DeLiang Wang,Zheng Zhao,Ben Zhong Tang,Yu Xiong,Ben Zhong Tang
标识
DOI:10.1002/adfm.202101656
摘要
Organic phosphors exhibiting room-temperature phosphorescence (RTP) in amorphous phase are good candidates for optoelectronic and biomedical applications. In this proof-of-concept work, a rational strategy to activate wide-color ranged and persistent RTP from amorphous films by embedding electron-rich organic phosphor into electron-deficient matrix polyacrylonitrile (PAN) is presented. Through tailoring noncovalent interactions between the electron-deficient PAN matrix and electron-rich organic phosphors, an ultralong lifetime of 968.1 ms is obtained for doped film TBB-6OMe@PAN. Control experiments conducted on the polymers polymethyl methacrylate (PMMA) and polystyrene (PS) without electron-withdrawing groups, and organic phosphors containing electron-withdrawing groups indicate that the persistent RTP of doped films may be triggered by strong electrostatic interactions between electron-deficient PAN and electron-rich organic phosphor. Further theoretical calculations including electrostatic potential distributions, binding energies, and energy decomposing analysis demonstrate that both electrostatic and dispersion interactions between electron-deficient PAN and electron-rich organic phosphor are responsible for the activation of persistent RTP of doped films. In addition, the doped film TBB-6OMe@PAN still maintains brightness even after soaking in water for 12 weeks. This excellent water resistance not only is favorable for future applications but also demonstrates an advantage of electrostatic and dispersion interactions over hydrogen bonding interactions.
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