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This article reports a new class of mechano-optical materials CaZnOS : Cu with a non-centrosymmetric layered structure. The mechano-optical conversion is strongly dependent on the Cu concentration in CaZnOS. The mechano-optical conversion of CaZnOS : Cu changes from initial mechanoluminescence to mechanical quenching (MQ) with increasing Cu concentration, and reaches a maximum MQ intensity at 0.01%. It is proposed that MQ arises from nonradiative recombination, caused by electron transfer from trap levels to nonradiative centers as a result of the mechanical load.
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Tu et al. (2015) studied this question.
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