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.
Highlights
Nanoluminescent materials have always been the hotspot of scientific research [1,2,3]
transition-metal dichalcogenides (TMDCs) quantum dots (QDs) have been studied intensively as future optoelectronic materials owing to their dramatic properties [4,11,12,13] and widespread applications, such as fluorescent imaging, biomedical imaging, biological sensing [14], light emitting devices [15], photocatalytic, and hydrogen generation [16] et al [17,18]
PL spectra were measured by a HORIBA iHR320 spectrometer (Minami-ku, Kyoto, Japan).The lasing characteristics of WSe2 QDs were studied by third harmonic generation from a neodymium-doped yttrium aluminum garnet (Nd:YAG) pulsed laser (355 nm, 10 Hz, Continuum Surelite, San Jose, CA, USA) with an optical parameter oscillator (Continuum Horizon, San Jose, CA, USA) to expand the Nd:YAG laser to different excitation wavelengths
Summary
Nanoluminescent materials have always been the hotspot of scientific research [1,2,3]. TMDCs quantum dots (QDs) have been studied intensively as future optoelectronic materials owing to their dramatic properties [4,11,12,13] and widespread applications, such as fluorescent imaging, biomedical imaging, biological sensing [14], light emitting devices [15], photocatalytic, and hydrogen generation [16] et al [17,18]. TMDCs QDs exhibit excellent PL properties which profit from quantum confinement effect and some of the inherent merits of the 2D materials.
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