期刊
ADVANCED SCIENCE
卷 5, 期 11, 页码 -出版社
WILEY
DOI: 10.1002/advs.201801187
关键词
excimers; exciplexes; mechanochromic delayed fluorescence; metal-organic microsheets; singlet-triplet states
资金
- 973 Program [2014CB932103]
- National Natural Science Foundation of China [21301016, 21473013, 21541010, 21771021]
- Beijing Municipal Natural Science Foundation [2152016, 2182028]
- Fundamental Research Funds for the Central Universities
- Analytical and Measurements Fund of Beijing Normal University
Mechanochromic luminescent materials have attracted much attention and present a variety of applications in information security, data recording, and storage devices. However, most of these smart luminescent systems are based on typical fluorescence and/or phosphorescence mechanisms; the mechanochromic delayed fluorescence (MCDF) materials involving switching singlet and triplet states are rarely studied to date. Herein, new 2D layered metal-organic micro/nanosheets, [Cd(9-AC)(2)(BIM)(2)] (named as MCDF-1; 9-AC = anthracene-9-carboxylate and BIM = benzimidazole) and its solvate form containing interlayer CH3CN (named as MCDF-2), which exhibit reversible mechanochromic delayed fluorescence characteristics, are presented. With applying the mechanical force, the luminescent center of MCDF-1 can be converted from 9-AC/BIM exciplex to 9-AC/9-AC excimer, resulting in alternations of delayed fluorescence. Such luminescent change can be further recovered by CH3CN fumigation, accompanied by the structural transformation from MCDF-1 to MCDF-2. Furthermore, the force-responsive process also refers to the energy redistribution between singlet and triplet states as inferred by both temperature-dependent photophysics and theoretical calculations. Therefore, this work not only develops new 2D micro/nanosheets as MCDF materials, but also supplies a singlet-triplet energy switching mechanism on their reversible mechanochromic process.
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