Realization of Lasing Emission from One Step Fabricated WSe₂ Quantum Dots

Pengpeng Ren; Wenfei Zhang; Yiqun Ni; Di Xiao; Honghao Wan; Ya-Pei Peng; Ling Li; Peiguang Yan; Shuangchen Ruan

doi:10.3390/nano8070538

Realization of Lasing Emission from One Step Fabricated WSe₂ Quantum Dots

Nanomaterials (Basel). 2018 Jul 17;8(7):538. doi: 10.3390/nano8070538.

Authors

Pengpeng Ren¹, Wenfei Zhang², Yiqun Ni³, Di Xiao⁴, Honghao Wan⁵, Ya-Pei Peng⁶, Ling Li⁷, Peiguang Yan⁸, Shuangchen Ruan⁹

Affiliations

¹ Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. 2160190404@email.szu.edu.cn.
² Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. zhangwf@szu.edu.cn.
³ Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. 18394667281@163.com.
⁴ Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. 2170285214@email.szu.edu.cn.
⁵ Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. 2170285219@email.szu.edu.cn.
⁶ Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. yppeng@szu.edu.cn.
⁷ Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. liling@szu.edu.cn.
⁸ Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. yanpg@szu.edu.cn.
⁹ Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. scruan@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.

Keywords: Laser; Two-dimensional transition-metal dichalcogenides; WSe2 quantum dots; photoluminenscence.