A Zero-Dimensional Organic Seesaw-Shaped Tin Bromide with Highly Efficient Strongly Stokes-Shifted Deep-Red Emission

Chenkun Zhou; Haoran Lin; Hongliang Shi; Yu Tian; Chongin Pak; Michael Shatruk; Yan Zhou; Peter Djurovich; Mao-Hua Du; Biwu Ma

doi:10.1002/anie.201710383

A Zero-Dimensional Organic Seesaw-Shaped Tin Bromide with Highly Efficient Strongly Stokes-Shifted Deep-Red Emission

Angew Chem Int Ed Engl. 2018 Jan 22;57(4):1021-1024. doi: 10.1002/anie.201710383. Epub 2017 Dec 21.

Authors

Chenkun Zhou¹, Haoran Lin¹, Hongliang Shi², Yu Tian³, Chongin Pak⁴, Michael Shatruk⁴, Yan Zhou⁴, Peter Djurovich⁵, Mao-Hua Du⁶, Biwu Ma^{1

3

4}

Affiliations

¹ Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, FL, 32310, USA.
² Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education), Department of Physics, Beihang University, Beijing, 100191, China.
³ Materials Science and Engineering Program, Florida State University, Tallahassee, FL, 32306, USA.
⁴ Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306, USA.
⁵ Department of Chemistry, University of Southern California, Los Angeles, CA, 90089, USA.
⁶ Materials Science & Technology Division and Center for Radiation Detection Materials and Systems, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.

PMID: 29215786
DOI: 10.1002/anie.201710383

Abstract

The synthesis and characterization is reported of (C₉ NH₂₀ )₂ SnBr₄ , a novel organic metal halide hybrid with a zero-dimensional (0D) structure, in which individual seesaw-shaped tin (II) bromide anions (SnBr₄^2- ) are co-crystallized with 1-butyl-1-methylpyrrolidinium cations (C₉ NH₂₀⁺ ). 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 SnBr₄^2- species, and 2) the seesaw structure enabling a pronounced excited state structural deformation as confirmed by density functional theory (DFT) calculations.

Keywords: deep-red emission; large Stokes shift; organic-inorganic hybrids; seesaw structure; zero-dimensional materials.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.