Issue 18, 2021

Synergistic defect engineering and microstructure tuning in lithium tantalate for high-contrast mechanoluminescence of Bi3+: toward application for optical information display

Abstract

Mechanoluminescence (ML) materials possess the mechano-optical conversion property that can produce luminescence emission upon a mechanical stimulus. This stress-luminescence responsiveness endows ML materials with application potential for optical information display. For the existing ML materials, the consecutive and overlapped trap-depth distribution in ML materials can sustain persistent afterglow noise and hinder the recognition of ML signals continually. In this study, we designed a synergistic strategy that combines defect engineering with microstructure tuning to achieve the high-contrast ML emission of Bi3+ in lithium tantalite. Non-luminous Ga3+ ions are employed as co-dopants to tune the defect trap distribution and microstructure in Bi3+-doped LiTaO3 crystals. The as-prepared Bi3+/Ga3+ codoped LiTaO3 material showed intense high-contrast ML emission with no afterglow interference under an external mechanical stimulus. Its high-contrast ML intensity increased linearly with increasing applied force (>1200 N), showing no threshold force. The composite film combined with LiTaO3:Bi/Ga particles can respond sensitively and notably to multifarious mechanical stimuli by radiating indigo blue ML light, including stretching, bending and friction. These discoveries provide a new research perspective to investigate stimuli-responsive luminophors toward various application requirements especially with optical information storage and display.

Graphical abstract: Synergistic defect engineering and microstructure tuning in lithium tantalate for high-contrast mechanoluminescence of Bi3+: toward application for optical information display

Supplementary files

Article information

Article type
Research Article
Submitted
13 May 2021
Accepted
21 Jul 2021
First published
21 Jul 2021

Mater. Chem. Front., 2021,5, 6891-6903

Synergistic defect engineering and microstructure tuning in lithium tantalate for high-contrast mechanoluminescence of Bi3+: toward application for optical information display

R. Hu, Y. Zhang, Y. Zhao, X. Wang, G. Li and M. Deng, Mater. Chem. Front., 2021, 5, 6891 DOI: 10.1039/D1QM00723H

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