Temperature dependence of the optical transitions of PbS quantum dots in silicate glasses

Litvyak, V. M.; Cherbunin, R. V.; Onushchenko, A. A.

doi:10.3103/s106287381712022x

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…As can be seen in Figure a, the PL peak of PbS QDs was blue-shifted to ∼19.9 meV, and it is approximately linear for T > 80 K. The energy shift at T > 80 K was calculated and can be described by a temperature coefficient of α PbS = 0.1 meV/K. This value is smaller than that of the bulk PbS (α = 0.52 meV/K), but it is comparable to that in the reported studies of thiol-capped PbS QDs (α = 0.3meV/K) and PbS QDs in glass (α = 0.2 meV/K) . For the PbS/MnS QD sample, the value of α PbS/MnS becomes significantly smaller than that for PbS QDs, which is 0.05 meV/K.…”

Section: Resultssupporting

confidence: 77%

“…This value is smaller than that of the bulk PbS (α = 0.52 meV/K), but it is comparable to that in the reported studies of thiol-capped PbS QDs (α = 0.3meV/K) 30 and PbS QDs in glass (α = 0.2 meV/K). 34 For the PbS/MnS QD sample, the value of α PbS/MnS becomes significantly smaller than that for PbS QDs, which is 0.05 meV/K. This result is expected due to the negative value of α in MnS bulk (α MnS = −2 meV/K).…”

Section: Resultsmentioning

confidence: 81%

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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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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 81%

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

et al. 2020

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“…Based on Figure 4(b), PL peak energy was redshifted when the temperature is increased from 20 K to 60 K, while it blue-shifted from T >80 K. The energy shifts for temperature higher than 80 K can be described by a temperature coefficient, α = dE g /dT = 0.1 meV/K. This value is smaller compared to bulk PbS (α = 0.52 meV/K), but is comparable to that reported in previous study of thiol-capped PbS QDs (α = 0.3meV/K) and PbS QDs in glass (α = 0.2 meV/K) (Litvyak et al 2017;Turyanska et al 2007). Usually, the temperature dependence of the PL peak position can well be described by Varshni equation (Varshni 1967),…”

Section: Photoluminescence Temperature Dependence Of the Colloidalsupporting

confidence: 83%

Temperature and Power Dependence of Photoluminescence in PBS Quantum Dots Nanoparticles

Zaini¹,

Kamarudin²,

Liew³

et al. 2019

JSM

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In this study, the synthesis and the effect of temperature and power excitation towards photoluminescence (PL) emission of colloidal PbS quantum dots (QDs) were reported. Water soluble PbS QDs capped with a mixture of 1-thioglycerol (TGL) and dithioglycerol (DTG) was synthesized via colloidal chemistry method at room temperature. The PL emission of PbS QDs was investigated under temperature range from 10 K to 300 K and we found that the PL emission blue-shifted when the temperature is increased. From high resolution transmission electron microscopy (HRTEM), the average size of PbS core QDs is determined to be 6 nm and the integrated PL intensity (IPL) versus excitation power density shows the recombination of electrons and holes occur efficiently at low and high temperature for the PbS QDs. Full width half maximum (FWHM) shows a gradual broadening with the increasing temperature due to the interaction of charge carriers with phonons.

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“…However, the value of α for the PbS/MnTe compound QDs decreased slightly ( α = 0.11 meV/K). Generally, the value of dE / dT is mainly attributed to the thermal expansion coefficient and electron–phonon interactions [ 35 , 36 ]. In specific terms, the value of the thermal expansion coefficient of bulk MnTe (−3.42 meV/K) was smaller than that of PbS in bulk (0.52 meV/K).…”

Section: Resultsmentioning

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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Temperature dependence of the optical transitions of PbS quantum dots in silicate glasses

Cited by 4 publications

References 4 publications

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

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

Temperature and Power Dependence of Photoluminescence in PBS Quantum Dots Nanoparticles

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

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