Upconversion photoluminescence in WSSe alloy monolayer under uniaxial tensile strain

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-09-26 DOI:10.1016/j.optmat.2025.117563

Shrawan Roy , Jie Gao , Xiaodong Yang

引用次数: 0

Abstract

The optical responses of monolayer transition metal dichalcogenides (1L-TMDs) can be tuned effectively by using mechanical strain. In this work, the tuning of upconversion photoluminescence (UPL) emission in 1L-WSSe alloy by applying uniaxial tensile strain is investigated. When the uniaxial tensile strain is changed from 0 % to 1.02 %, the peak position of UPL emission has a redshift of around 25.6 nm, and the UPL intensity goes up with an exponential function of the applied strain as the upconversion energy difference is varied from −197 meV to −131 meV. The sublinear power dependence for UPL emission in 1L-WSSe alloy indicates the multiphonon-mediated upconversion emission process involved with one photon. The demonstrated strain-tunable UPL emission in 1L-TMD alloys will advance potential applications in upconversion photonic devices and flexible optoelectronics.

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单轴拉伸应变下WSSe合金单层的上转换光致发光

利用机械应变可以有效地调谐单层过渡金属二硫族化合物（1L-TMDs）的光学响应。本文研究了施加单轴拉伸应变对1L-WSSe合金上转换光致发光（UPL）发射的调谐。当单轴拉伸应变从0%变化到1.02%时，UPL发射峰位置红移约25.6 nm，当上转换能差从- 197 meV变化到- 131 meV时，UPL强度随外加应变呈指数函数增加。1L-WSSe合金中UPL发射的亚线性功率依赖性表明了一个光子参与的多声子介导的上转换发射过程。在1L-TMD合金中显示的应变可调谐UPL发射将推进在上转换光子器件和柔性光电子学中的潜在应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.