Synthesis of blue photoluminescent WS 2  quantum dots via ultrasonic cavitation

Bayat, Amir; Saievar-Iranizad, Esmaiel

doi:10.1016/j.jlumin.2017.01.024

Cited by 57 publications

(43 citation statements)

References 43 publications

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“…Ultrasonic probe sonication has been proved to be an efficient method to fabricate TMDCs QDs in liquid solvent because of the process of cavitation [ 11 ]. The morphology of the as-prepared WSe 2 QDs shows a uniform distribution in the transmission electron microscopy (TEM) analysis.…”

Section: Resultsmentioning

confidence: 99%

“…Two-dimensional (2D) transition-metal dichalcogenides (TMDCs), especially, have attracted significant attention because of their unique properties [ 5 , 6 , 7 , 8 , 9 , 10 ]. TMDCs quantum dots (QDs) have also 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 systems have been demonstrated to exhibit distinctive photoluminescence (PL) characteristics [ 19 , 20 , 21 , 22 ] because of their direct energy band gap.…”

Section: Introductionmentioning

confidence: 99%

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Realization of Lasing Emission from One Step Fabricated WSe2 Quantum Dots

Ren

Zhang

et al. 2018

Nanomaterials

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Realization of Lasing Emission from One Step Fabricated WSe2 Quantum Dots

Ren

Zhang

et al. 2018

Nanomaterials

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“…QDs, the presence of oxygen moieties adsorbed at the QD edges, etc., have also been proposed for understanding the mechanism of excitation-wavelength-dependent PL in 2D QDs. [16][17][18] The origin of the excitation-wavelength-dependent PL in the variety of 2D based QDs still deserves further investigations for its potential applications in multicolor biolabeling and optoelectronic devices. [19] Nevertheless, this tunable emission property is valuable for emission color engineering with a single material in contrast to the conventional WLEDs using multiple layers of materials responsible for emitting different colors.…”

Section: Doi: 101002/smll201901908mentioning

confidence: 99%

“…Ghorai et al pointed out that the excitation‐wavelength‐dependent PL for the pristine WS 2 QDs is closed related to the recombination of carriers from the localized states . Other mechanisms including the polydispersity of QDs, the presence of oxygen moieties adsorbed at the QD edges, etc., have also been proposed for understanding the mechanism of excitation‐wavelength‐dependent PL in 2D QDs . The origin of the excitation‐wavelength‐dependent PL in the variety of 2D based QDs still deserves further investigations for its potential applications in multicolor biolabeling and optoelectronic devices .…”

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confidence: 99%

Electrically Pumped White‐Light‐Emitting Diodes Based on Histidine‐Doped MoS₂ Quantum Dots

Lin

et al. 2019

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MoS2 quantum dots (QDs)‐based white‐light‐emitting diodes (QD‐WLEDs) are designed, fabricated, and demonstrated. The highly luminescent, histidine‐doped MoS2 QDs synthesized by microwave induced fragmentation of 2D MoS2 nanoflakes possess a wide distribution of available electronic states as inferred from the pronounced excitation‐wavelength‐dependent emission properties. Notably, the histidine‐doped MoS2 QDs show a very strong emission intensity, which exceeds seven times of magnitude larger than that of pristine MoS2 QDs. The strongly enhanced emission is mainly attributed to nitrogen acceptor bound excitons and passivation of defects by histidine‐doping, which can enhance the radiative recombination drastically. The enabled electroluminescence (EL) spectra of the QD‐WLEDs with the main peak around 500 nm are found to be consistent with the photoluminescence spectra of the histidine‐doped MoS2 QDs. The enhanced intensity of EL spectra with the current increase shows the stability of histidine‐doped MoS2 based QD‐WLEDs. The typical EL spectrum of the novel QD‐WLEDs has a Commission Internationale de l'Eclairage chromaticity coordinate of (0.30, 0.36) exhibiting an intrinsic broadband white‐light emission. The unprecedented and low‐toxicity QD‐WLEDs based on a single light‐emitting material can serve as an excellent alternative for using transition metal dichalcogenides QDs as next generation optoelectronic devices.

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“…The peak at $230 nm is attributed to the strong quantum connement effect due to the small size of the WS 2 QDs. [18][19][20] While the shoulder peak at $275 nm is attributed to optical transitions between the density of states in the valence and conduction band. 16 Previous studies have reported that WS 2 QDs, synthesized through different methods, emit blue luminescence mostly.…”

Section: Methodsmentioning

confidence: 99%