Upconversion photoluminescence in WSSe alloy monolayer under uniaxial tensile strain

Shrawan Roy; Jie Gao; Xiaodong Yang

doi:10.1016/j.optmat.2025.117563

Upconversion photoluminescence in WSSe alloy monolayer under uniaxial tensile strain

Shrawan Roy
, Jie Gao
, Xiaodong Yang

Mechanical Engineering

Missouri University of Science and Technology

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	117563
Journal	Optical Materials
Volume	169
DOIs	https://doi.org/10.1016/j.optmat.2025.117563
State	Published - Jan 2026

Keywords

Uniaxial tensile strain
Upconversion photoluminescence
WSSe alloy monolayer

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10.1016/j.optmat.2025.117563

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title = "Upconversion photoluminescence in WSSe alloy monolayer under uniaxial tensile strain",

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.",

keywords = "Uniaxial tensile strain, Upconversion photoluminescence, WSSe alloy monolayer",

author = "Shrawan Roy and Jie Gao and Xiaodong Yang",

note = "Publisher Copyright: {\textcopyright} 2025 Elsevier B.V.",

year = "2026",

month = jan,

doi = "10.1016/j.optmat.2025.117563",

language = "English",

volume = "169",

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TY - JOUR

T1 - Upconversion photoluminescence in WSSe alloy monolayer under uniaxial tensile strain

AU - Roy, Shrawan

AU - Gao, Jie

AU - Yang, Xiaodong

PY - 2026/1

Y1 - 2026/1

N2 - 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.

AB - 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.

KW - Uniaxial tensile strain

KW - Upconversion photoluminescence

KW - WSSe alloy monolayer

UR - https://www.scopus.com/pages/publications/105017000287

U2 - 10.1016/j.optmat.2025.117563

DO - 10.1016/j.optmat.2025.117563

M3 - Article

AN - SCOPUS:105017000287

SN - 0925-3467

VL - 169

JO - Optical Materials

JF - Optical Materials

M1 - 117563

ER -

Upconversion photoluminescence in WSSe alloy monolayer under uniaxial tensile strain

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