期刊
MACROMOLECULAR CHEMISTRY AND PHYSICS
卷 223, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.202100425
关键词
clustering-triggered emissions; nontraditional luminogens; red-shifted emission; through-space conjugation
资金
- National Natural Science Foundation of China [21574015, 21875023]
- Program for Changjiang Scholars and Innovative Research Team (PCSIRT) in University
Nontraditional organic/polymeric luminogens, which lack conventional chromophores, have attracted significant attention for their fundamental understanding of photoluminescence mechanisms and potential applications. While most nontraditional luminogens emit blue fluorescence, there is limited research on those with green, yellow, and red emissions. Therefore, it is crucial to develop nontraditional luminogens with red-shifted emissions and understand their mechanisms.
Nontraditional organic/polymeric luminogens, which do not contain any conventional chromophores like large pi-conjugated benzene rings and/or heterocycles, have attracted rapidly growing attention owing to their importance in the fundamental understanding of photoluminescence mechanisms and potential practical applications. However, compared to traditional luminogens, most nontraditional luminogens (NTLs) emit fluorescence in the blue region, and only very limited NTLs with green, yellow, and red emissions have been reported. It is of great scientific and practical importance to develop NTLs with red-shifted emissions and understand their mechanisms. This review first provides a brief overview of the types of NTLs based on heteroatoms in them, the luminescence mechanism and luminescent characteristics of NTLs, then summarizes recent progress in NTLs with red-shifted emissions and the main strategies employed, i.e., introducing multiple nonconventional chromophores, introducing intra-/intermolecular interactions to rigidify clusters, and introducing electron-giving/withdrawing groups into molecules to lower the gap between the HOMO-LUMO energy levels. This review also provides the perspectives and outlook on future development of NTLs with red-shifted emissions.
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