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Article Dans Une Revue Advanced Functional Materials Année : 2021

Self‐Recoverable Mechanically Induced Instant Luminescence from Cr 3+ ‐Doped LiGa 5 O 8

Résumé

Mechanoluminescence (ML) featuring photon emission under external mechanical stimuli has been widely investigated due to its potential applications in various fields such as display, pressure monitoring and energy harvesting. However, except for doped ZnS, all the existing ML phosphors require light pre-irradiation to power ML, which hinders practical applications. Meanwhile, except Mn 2+ and Cu + , no other transition metal cation has been established as effective activator for ML phosphors. In the present paper, for the first time, one report the self-recoverable deep-red-to-near-infrared ML in Cr 3+ doped LiGa 5 O 8 phosphor without any light pre-irradiation. Furthermore the mechanoluminescence intensity of this phosphor can be fully restored after each mechanical loading cycle. One further demonstrate that by codoping the compounds with Al 3+ cations in order to tune traps redistribution, the ML performance of the phosphor can be further optimized. Then a possible mechanism for ML in Cr 3+ doped LiGa 5 O 8 phosphor is proposed. Theoretical calculations reveal the significant role of Cr dopants in the modulation of the local electronic environments for achieving ML. Owing to the induced inter-electronic-levels and shallow electron traps distribution, electron recombination efficiency is enhanced both through tunneling effect and energy transfer toward dopant levels. Such ML can penetrate through a 2 mm-thick pork slice including skin, fat and lean, making this material promising for wide range of in-vivo applications such as optical imaging of intracorporal stress/strain distribution and dynamics. The present work offers an example of material suitable in new wavelengths range thank to new ML activator, fulfilling a research gap in ML research field and this work is expected to promote further advancement of ML materials both fundamentally and practically.
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Dates et versions

hal-03447690 , version 1 (24-11-2021)

Identifiants

Citer

Puxian Xiong, Bolong Huang, Dengfeng Peng, Bruno Viana, Mingying Peng, et al.. Self‐Recoverable Mechanically Induced Instant Luminescence from Cr 3+ ‐Doped LiGa 5 O 8. Advanced Functional Materials, 2021, 31 (19), pp.2010685. ⟨10.1002/adfm.202010685⟩. ⟨hal-03447690⟩
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