Temperature and Power Dependence of Photoluminescence in PBS Quantum Dots Nanoparticles

Zaini, Muhammad Safwan; Kamarudin, Mazliana Ahmad; Liew, Josephine Ying Chyi; Ahmad, Shahrul Ainliah Alang; Mohmad, Abdul Rahman

doi:10.17576/jsm-2019-4806-16

Cited by 10 publications

(14 citation statements)

References 38 publications

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“…In this procedure, the molar ratios of Pb 2+ , S 2− and Mn 2+ precursors were fixed to 1, 0.3 and 0.2, respectively. Zaini et al [28]. From this procedure, the typical size of the QDs obtained was approximately 6.00 ± 1.00 nm.…”

Section: Sample Preparationmentioning

confidence: 93%

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Quantum Confinement Effect and Photoenhancement of Photoluminescence of PbS and PbS/MnS Quantum Dots

et al. 2020

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The quantum confinement effect and photoenhancement of photoluminescence (PL) of lead sulphide (PbS) quantum dots (QDs) and lead sulphide/manganese sulphide (PbS/MnS) core shell QDs capped with thiol ligands in aqueous solution were investigated. From PL results, the presence of MnS shells gives a strong confinement effect which translates to higher emission energy in PbS/MnS core shell QDs. Increasing MnS shell thickness from 0.3 to 1.5 monolayers (ML) causes a blueshift of PL peak energies as the charge carriers concentrated in the PbS core region. Enhancement of the PL intensity of colloidal PbS and PbS/MnS core shell QDs has been observed when the samples are illuminated above the band gap energy, under continuous irradiation for 40 min. Luminescence from PbS QDs and PbS/MnS core shell QDs can be strongly influenced by the interaction of water molecules and oxygen present in aqueous solution adsorbed on the QD surface. However, PbS/MnS core shell QDs with a shell thickness of 1.5 ML did not show a PL peak energy stability as it was redshifted after 25 min, probably due to wider size distribution of the QDs.

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Section: Sample Preparationmentioning

confidence: 93%

“…All chemicals were used without any further purification. The synthesis was started with the preparation of PbS QDs in aqueous solution which followed the procedure as reported by Zaini et al [28]. From this procedure, the typical size of the QDs obtained was approximately 6.00 ± 1.00 nm.…”

Section: Sample Preparationmentioning

confidence: 99%

Quantum Confinement Effect and Photoenhancement of Photoluminescence of PbS and PbS/MnS Quantum Dots

et al. 2020

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“…PbS QDs were synthesized in an aqueous solution following the procedure as reported in a previous work [ 25 ]. Briefly, Pb(CH 3 COO) 2 .3H 2 O (0.190 g), TGL (26 µL), and DTG (10 µL) were dissolved in deionized water, and the mixture was stirred for 15 min under the flow of nitrogen (N 2 ) gas.…”

Section: Methodsmentioning

confidence: 99%

Study of the Electron-Phonon Coupling in PbS/MnTe Quantum Dots Based on Temperature-Dependent Photoluminescence

et al. 2022

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The temperature dependence of photoluminescence (PL) emission is a valuable tool for investigating carrier localization, recombination, and carrier–phonon interactions. Herein, electron–phonon couplings in lead sulfide (PbS) quantum dots (QDs) and lead sulfide/manganese tellurite (PbS/MnTe) QDs is reported. The effect of temperature on the PL emission of PbS and PbS/MnTe was explored within a temperature range of 10 to 300 K. When temperature increased, PL emission was blue-shifted due to the confinement effect. The gradual broadening of the full width at half maximum (FWHM) with increasing temperature indicates electron–phonon interactions. An analysis based on the Boson model revealed that the values of the exciton acoustic phonon coupling coefficient, σ, and temperature-dependent linewidth, γ, for PbS/MnTe were larger than those for PbS, indicating stronger exciton longitudinal-optical–phonon coupling in the compound structure.

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“…In this experiment, all chemicals were used without any further purification. The synthesis was started with the preparation of PbS QDs in aqueous solution, which followed the procedure as reported by Zaini et al 23 Briefly, the sample preparation utilized lead (II) acetate to extract Pb 2+ as a lead precursor and sodium sulfide to extract S 2– as a sulfide precursor. TGL and DTG were used as capping ligands.…”

Section: Experimental Sectionmentioning

confidence: 99%

Photoluminescence Investigation of Carrier Localization in Colloidal PbS and PbS/MnS Quantum Dots

et al. 2020

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The existence of surface organic capping ligands on quantum dots (QDs) has limited the potential in QDs emission properties and energy band gap structure alteration as well as the carrier localization. This drawback can be addressed via depositing a thin layer of a semiconductor material on the surface of QDs. Herein, we report on the comparative study for photoluminescent (PL) properties of PbS and PbS/MnS QDs. The carrier localization effect due to the alteration of energy band gap structure and carrier recombination mechanism in the QDs were investigated via PL measurements in a temperature range of 10− 300 K with the variation of the excitation power from 10 to 200 mW. For PbS QDs, the gradient of integrated PL intensity (IPL) as a function of excitation power density graph was less than unity. When the MnS shell layer was deposited onto the PbS core, the PL emission exhibited a blue shift, showing dominant carrier recombination. It was also found that the full width half-maximum showed a gradual broadening with the increasing temperature, affirming the electron−phonon interaction.

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Temperature and Power Dependence of Photoluminescence in PBS Quantum Dots Nanoparticles

Cited by 10 publications

References 38 publications

Quantum Confinement Effect and Photoenhancement of Photoluminescence of PbS and PbS/MnS Quantum Dots

Quantum Confinement Effect and Photoenhancement of Photoluminescence of PbS and PbS/MnS Quantum Dots

Study of the Electron-Phonon Coupling in PbS/MnTe Quantum Dots Based on Temperature-Dependent Photoluminescence

Photoluminescence Investigation of Carrier Localization in Colloidal PbS and PbS/MnS Quantum Dots

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