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Photoluminescent Behaviors of Thermally Activated Delayed Fluorescence Polymeric Emitters in Nanofibers
Author(s) -
Li Chensen,
Liu Yuchao,
Zhao Zhennan,
Liu Junteng,
Ren Zhongjie,
Yan Shouke
Publication year - 2021
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000588
Subject(s) - nanofiber , photoluminescence , polyacrylonitrile , electrospinning , intersystem crossing , materials science , quantum yield , polymer , nanotechnology , fluorescence , optoelectronics , excited state , composite material , optics , singlet state , physics , nuclear physics
Anisotropic 1D nanostructures with high surface‐area‐to‐volume ratio display the enhanced optoelectronic properties of light‐emitting compounds compared to bulk or 2D systems. To study the effect of nanometer‐constrained space on photoluminescent behavior of thermally activated delayed fluorescence (TADF) polymeric emitters, electrospinning technique is used to produce nanofibers of TADF emitters. Herein, two TADF polymer (P1 and P3) nanofibers with 90% polyacrylonitrile (PAN) are fabricated and their photophysical properties are studied and compared with their spin‐coated film counterparts. The distinguishing polarized photoluminescencent properties of P1/PAN or P3/PAN electrospun nanofibers are obtained due to high orientation degree and superior molecular arrangement. Moreover, the better TADF properties in nanofibers can be observed comparing with their spin‐coated films, including longer‐lived excited states, higher photoluminescence quantum efficiency, lower internal conversion decay rate, and higher reverse intersystem crossing rate constant.