低温单轴弹性形变影响下提高 KBr 晶体发光产率的机制

IF 2.4 4区材料科学 Q2 CRYSTALLOGRAPHY

Crystals Pub Date : 2024-07-31 DOI:10.3390/cryst14080698

Kuanyshbek Shunkeyev, Shynar Sagimbayeva, Zhiger Ubaev, Adelya Kenzhebayeva

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引用次数: 0

摘要

本研究通过发光光谱技术研究了电子激发的辐射弛豫，该技术适用于沿和晶体学方向发生低温（85 K）单轴形变的高纯度 KBr 晶体。结果表明，在 KBr 晶体中，沿着与阴离子自俘获激子的空穴分量轴线一致的方向发生弹性形变时，自俘获激子的 σ-(4.42 eV) 和 π-(2.3 eV) 发光强度会得到最显著的增强。形变引起的 X 射线、隧穿和热激发发光光谱的变化揭示了一个新的波段（标记为 Ex），峰值约为 3.58 eV，这归因于基态 F'- 和 VK 中心之间的隧穿电荷交换。

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Mechanisms for Enhancing Luminescence Yield in KBr Crystals under the Influence of Low-Temperature Uniaxial Elastic Deformation

This study investigates the radiative relaxation of electronic excitations through luminescence spectroscopy techniques applied to high-purity KBr crystals subjected to low-temperature (85 K) uniaxial deformation along the <100> and <110> crystallographic directions. Results demonstrate that the most significant enhancement in the intensity of σ-(4.42 eV) and π-(2.3 eV) luminescence from self-trapped excitons in KBr crystals occurs with elastic deformation along the <110> direction, aligning with the axis of the hole component of the anion self-trapped exciton. Deformation-induced changes in X-ray, tunneling, and thermally stimulated luminescence spectra reveal a new band, denoted as Ex, peaking at approximately 3.58 eV, attributed to tunneling charge exchange between the F’- and VK-centers in their ground state.

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来源期刊

Crystals CRYSTALLOGRAPHYMATERIALS SCIENCE, MULTIDIS-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

4.20

自引率

11.10%

发文量

1527

审稿时长

16.12 days

期刊介绍： Crystals (ISSN 2073-4352) is an open access journal that covers all aspects of crystalline material research. Crystals can act as a reference, and as a publication resource, to the community. It publishes reviews, regular research articles, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on article length. Full experimental details must be provided to enable the results to be reproduced. Crystals provides a forum for the advancement of our understanding of the nucleation, growth, processing, and characterization of crystalline materials. Their mechanical, chemical, electronic, magnetic, and optical properties, and their diverse applications, are all considered to be of importance.