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Expanding the 0D Rb 7 M 3 X 16 (M=Sb, Bi; X=Br, I) Family: Dual‐Band Luminescence in Rb 7 Sb 3 Br 16
Author(s) -
McCall Kyle M.,
Benin Bogdan M.,
Wörle Michael,
Vonderach Thomas,
Günther Detlef,
Kovalenko Maksym V.
Publication year - 2021
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.202000206
Subject(s) - luminescence , chemistry , halide , photoluminescence , octahedron , orthorhombic crystal system , crystallography , band gap , metal halides , crystal structure , inorganic chemistry , optoelectronics , materials science
Inorganic, lead‐free metal halides are widely sought after following the rise of the halide perovskites as outstanding optoelectronic materials, due to their enhanced stability and reduced toxicity. Herein, we report on the solvothermal synthesis of Rb 7 Sb 3 Br 16 , which exhibits a 0D structure comprised of [SbBr 6 ] 3− octahedra and edge‐sharing bioctahedra [Sb 2 Br 10 ] 4− dimers that order into layers along the c ‐axis. This all‐inorganic material is air‐stable and exhibits weak orange photoluminescence (PL) at room temperature. Low‐temperature PL and PL excitation (PLE) measurements reveal the presence of two distinct emission bands that originate from these structural units, with the high‐energy emission quenching as temperature rises beyond 150 K. We are also able to obtain Rb 7 Bi 3 Br 16 and Rb 7 Bi 3 I 16 which both crystallize in orthorhombic symmetry, with Rb 7 Bi 3 Br 16 presenting weak low‐temperature luminescence while Rb 7 Bi 3 I 16 is non‐luminescent. This work expands the library of emissive inorganic metal halides and provides further evidence for the efficacy of low‐dimensional Sb−X luminescent centers based on octahedral and edge‐sharing [Sb 2 X 10 ] 4− dimers.