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Production and Targeting of Monovalent Quantum Dots
Published on: October 23, 2014
Realization of Lasing Emission from One Step Fabricated WSe₂ Quantum Dots
Pengpeng Ren1, Wenfei Zhang2, Yiqun Ni3
1Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. 2160190404@email.szu.edu.cn.
Abstract:
Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) quantum dots (QDs) are the vanguard due to their unique properties. In this work, WSe₂ QDs were fabricated via one step ultrasonic probe sonication. Excitation wavelength dependent photoluminescence (PL) is observed from WSe₂ QDs. Room-temperature lasing emission which benefits from 3.7 times enhancement of PL intensity by thermal treatment at ~470 nm was achieved with an excitation threshold value of ~3.5 kW/cm² in a Fabry⁻Perot laser cavity. To the best of our knowledge, this is the first demonstration of lasing emission from TMDCs QDs. This indicates that TMDCs QDs are a superior candidate as a new type of laser gain medium.
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