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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Optical and vibrational properties of CaZnOS: The role of intrinsic defects
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Optical and vibrational properties of CaZnOS: The role of intrinsic defects

机译：Caznos的光学和振动特性：内在缺陷的作用

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摘要

The development of new luminescent materials for lighting applications or stress sensors, mechano-driven lighting devices is a crucial technological topic. Materials suitable for these applications should guarantee a high chemical stability, easiness and green sintering procedure and optimal optical properties. In this framework Calcium Zinc oxysulfide (CaZnOS) represents one of the most promising materials, for its near UV excitation with a broad visible emission, a long phosphorescence and a mechano-luminescence effect that still need to be explored. In this work we report the optical properties and the kinetics of radiative recombination upon intrinsic and extrinsic excitation of pure CaZnOS, assessing the vibrational properties by means of Raman spectroscopy, and corroborated by DFT calculations. The analysis of time resolved measurements at room and low temperature (up to 10 K) give new insight on the distribution and nature of the defects that generate the luminescence upon external stress as well the long phosphorescence. Herein, we also present a model of the intrinsic defects and on the energy transfer mechanism among levels in pure CaZnOS matrix, opening new perspectives also on doped materials and for the development of piezoluminescent devices. (C) 2018 Elsevier B.V. All rights reserved.
机译：用于照明应用或应力传感器的新发光材料的开发，机械驱动的照明装置是一个关键的技术主题。适用于这些应用的材料应保证高化学稳定性，容易性和绿色烧结程序和最佳光学性能。在该骨架中，氧化铝锌（Caznos）代表最有前景的材料之一，其接近紫外线激发具有宽阔的可见发射，长磷光和机械发光效果，仍然需要探索。在这项工作中，我们在纯Caznos的内在和外在激发时报告光学性质和辐射重组的动力学，通过拉曼光谱评估振动性能，并通过DFT计算得到证实。在室温和低温（最多10 k）时，对时间分辨测量的分析，对在外部应力时产生发光的缺陷的分布和性质以及长的磷光的分布和性质进行了新的洞察。在此，我们还提出了纯Caznos基质的水平的内在缺陷和能量转移机制的模型，在掺杂材料和压电装置的开发中也开放新的视角。 （c）2018年elestvier b.v.保留所有权利。

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