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.
Recommended Citation
S. Roy et al., "Upconversion Photoluminescence in WSSe Alloy Monolayer under Uniaxial Tensile Strain," Optical Materials, vol. 169, article no. 117563, Elsevier, Jan 2026.
The definitive version is available at https://doi.org/10.1016/j.optmat.2025.117563
Department(s)
Mechanical and Aerospace Engineering
Publication Status
Full Text Access
Keywords and Phrases
Uniaxial tensile strain; Upconversion photoluminescence; WSSe alloy monolayer
International Standard Serial Number (ISSN)
0925-3467
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2026 Elsevier, All rights reserved.
Publication Date
01 Jan 2026
Comments
Defense Advanced Research Projects Agency, Grant W911NF2110353