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

Nanomaterials (Jul 2018)

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

Affiliations

Pengpeng Ren: Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Wenfei Zhang: Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Yiqun Ni: Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Di Xiao: Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Honghao Wan: Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Ya-Pei Peng: Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Ling Li: Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Peiguang Yan: Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Shuangchen Ruan: Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China

DOI: https://doi.org/10.3390/nano8070538
Journal volume & issue: Vol. 8, no. 7
p. 538

Abstract

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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.

Published in Nanomaterials

ISSN: 2079-4991 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: https://www.mdpi.com/journal/nanomaterials

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