Issue 13, 2020

Defect induced photoluminescence and triboluminescence in layered CaLaAl3O7

Abstract

In this work, a layered melilite structure, CaLaAl3O7, was synthesized and observed to have obvious luminescence behaviors under the stimuli of ultraviolet light and rubbing, which were called photoluminescence and triboluminescence, respectively. Considering the wide bandgap of CaLaAl3O7 and its specific crystal structure, the observed luminescence should be attributed to intrinsic defects. Both the photoluminescence and triboluminescence of CaLaAl3O7 show a strong dependence on the synthesis atmosphere, suggesting that they should be related to the oxygen vacancy. It is attractive to find that the triboluminescence of CaLaAl3O7 shows a distinct spectral characteristic compared to its photoluminescence. Further computational results suggest that the applied mechanical stimuli on the CaLaAl3O7 cell could promote the formation of the vacancies of oxygen and calcium, responsible for the spectral differences.

Graphical abstract: Defect induced photoluminescence and triboluminescence in layered CaLaAl3O7

Supplementary files

Article information

Article type
Communication
Submitted
29 sep 2019
Accepted
03 nov 2019
First published
04 nov 2019

Dalton Trans., 2020,49, 3942-3945

Defect induced photoluminescence and triboluminescence in layered CaLaAl3O7

Y. Li, I. P. Koskin, Z. Ma, E. Benassi and Z. Wang, Dalton Trans., 2020, 49, 3942 DOI: 10.1039/C9DT03849C

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