Issue 25, 2016

Process-dependent reversible mechanochromic luminescence of bismuth based polymorphs

Abstract

The two polymorphs α-[BiBr3(bp2mo)2] (1) and γ-[BiBr3(bp2mo)2] (2), which are aggregation induced phosphors (AIP), exhibit mechanochromic luminescence (MCL) properties: the grinding (g) of samples involves a crystal to amorphous state transition together with a change in luminescence from green (1: λem = 525 nm, 2: λem = 503 nm) to red (1-g: λem = 611 nm, 2-g: λem = 614 nm). The process is reversible by heating, exposure to vapor (H2O, ACN) or by recrystallization in a few drops of ACN. Interestingly, the heating and fuming processes of both ground samples 1-g and 2-g allow the recovery of the thermodynamic phase 1, while the fast recrystallization of 1-g and 2-g leads to the kinetic phase 2. Several applications can be envisaged for this unprecedented “one compound/three types of luminescence (g, 1, 2)” system, in the fields of organic compound detection, and humidity and thermal sensing.

Graphical abstract: Process-dependent reversible mechanochromic luminescence of bismuth based polymorphs

Supplementary files

Article information

Article type
Paper
Submitted
22 Apr 2016
Accepted
25 May 2016
First published
25 May 2016

J. Mater. Chem. C, 2016,4, 5940-5944

Process-dependent reversible mechanochromic luminescence of bismuth based polymorphs

O. Toma, N. Mercier and C. Botta, J. Mater. Chem. C, 2016, 4, 5940 DOI: 10.1039/C6TC01651K

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