Mechanoluminescence in BaSi2O2N2:Eu
Mechanoluminescence in BaSi2O2N2:Eu
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DOI：
10.1016/j.actamat.2012.06.055
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发表时间：
2012-09-01
期刊：
影响因子：
9.4
通讯作者：
Smet, Philippe F.
中科院分区：
文献类型：
--
作者：
Botterman, Jonas;Van den Eeckhout, Koen;Smet, Philippe F.
机械发光（ML）是在固体上的任何机械作用期间发生光发射的现象的总称，大致可分为两类：破坏性ML和非破坏性ML。对于高端应用（例如压力传感器）的实际使用，首选具有非破坏性ML特性的材料。本文报道了BaSi_2O_2N_2：Eu的强非破坏性ML。当预先用紫外线或蓝光照射时，这种磷光体在诸如摩擦或压力的机械刺激下显示强烈的蓝绿光发射。ML具有峰值在498 nm处的发射带，与稳态光致发光相比，其类似于4 nm的红移。讨论了ML的来源，并将其与BaSi_2O_2N_2：Eu的持续发光联系起来。这两种现象都是由相同的陷阱造成的。基于在该磷光体中ML的出现，我们能够表明BaSi_2O_2N_2：Eu的主要晶体结构属于空间群Cmc_2（1）。(C)2012 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Mechanoluminescence (ML), a general term for the phenomenon in which light emission occurs during any mechanical action on a solid, can be divided roughly into two classes: destructive ML and non-destructive ML. For practical use in high-end applications (e.g. pressure sensors), materials with non-destructive ML properties are preferred. This paper reports on the strong non-destructive ML in BaSi2O2N2:Eu. When irradiated in advance with ultraviolet or blue light, this phosphor shows intense blue-green light emission upon mechanical stimulation such as friction or pressure. The ML has an emission band peaking at 498 nm, which is similar to 4 nm red-shifted compared to the steady-state photoluminescence. The origin of the ML is discussed and related to the persistent luminescence of BaSi2O2N2:Eu. The same traps are responsible for both phenomena. Based on the occurrence of ML in this phosphor, we were able to show that the predominant crystallographic structure of BaSi2O2N2:Eu belongs to space group Cmc2(1). (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.