Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 4, Pages 1021-1024Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201710383
Keywords
deep-red emission; large Stokes shift; organic-inorganic hybrids; seesaw structure; zero-dimensional materials
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Funding
- Florida State University through the Energy and Materials Initiative
- GAP Commercialization Grant Program
- National Science Foundation (NSF) [DMR-1709116, CHE-1664661]
- National Natural Science Foundation of China (NSFC) [11604007]
- Beihang University
- NSF [CHE-1464955]
- Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
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The synthesis and characterization is reported of (C9NH20)(2)SnBr4, a novel organic metal halide hybrid with a zero-dimensional (0D) structure, in which individual seesaw-shaped tin (II) bromide anions (SnBr42-) are co-crystallized with 1-butyl-1-methylpyrrolidinium cations (C9NH20+). Upon photoexcitation, the bulk crystals exhibit a highly efficient broadband deep-red emission peaked at 695 nm, with a large Stokes shift of 332 nm and a high quantum efficiency of around 46%. The unique photophysical properties of this hybrid material are attributed to two major factors: 1) the 0D structure allowing the bulk crystals to exhibit the intrinsic properties of individual SnBr42- species, and 2) the seesaw structure enabling a pronounced excited state structural deformation as confirmed by density functional theory (DFT) calculations.
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