Identification of surface states in PbS quantum dots by temperature dependent photoluminescence

Pendyala, Naresh Babu; Rao, K. S. R. Koteswara

doi:10.1016/j.jlumin.2008.05.004

Cited by 39 publications

(22 citation statements)

References 14 publications

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“…The emission in the short wavelength region was ascribed to the 1S‐1S state and the other belonged to the trap state . Compared with counterpart colloidal QDs or core/shell QDs, the emission from the trap state of QD‐doped glasses was more intense, because PbS QDs were surrounded by amorphous glass matrix and the crystal structures of QDs were not less perfect with lack of Pb or S atoms . Furthermore, biexponential equation was used to fit the lifetime decay curve of this sample (Figure B).…”

Section: Resultsmentioning

confidence: 99%

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Energy transfer process and temperature‐dependent photoluminescence of PbS quantum dot‐doped glasses

et al. 2018

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PbS quantum dot (QD)‐doped glasses were fabricated through melt‐quenching method. After heat treatment schedule, uniform QDs were precipitated in the glasses and near‐infrared emission covering 900‐1700 nm was obtained under excitation. From photoluminescence (PL) spectra and lifetime decay curves, the whole emission band of QD‐doped glasses consisted of emission from the 1S‐1S state and the trap state. While using excitation with higher energy, the full width at half maximum (FWHM) of QD‐doped glasses broadened because smaller QDs were excited. Energy transfer process among QDs was revealed by measuring the lifetime of different emission bands in PL spectrum and the energy transferred from smaller QDs with broader bandgap to bigger QDs with narrow bandgap. Temperature‐dependent PL and the corresponding lifetime decay curves of PbS QD‐doped glasses were analyzed. Temperature‐dependent bandgap structure of PbS QDs was obtained by using density functional theory (DFT) calculations. The results here give deep insight into optical properties of PbS QD‐doped glasses and it is beneficial to design and develop high‐performance QD‐based optoelectronic devices in theory.

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Section: Resultsmentioning

confidence: 99%

“…Litvin et al proposed that temperature coefficient of the trap state is independent with the sizes of QDs. But the temperature coefficient of the 1S‐1S state can be influenced by the size of QDs, thermal expansion coefficient, stress, the ratio of Pb and S and electron‐phonon coupling interaction and so on …”

Section: Resultsmentioning

confidence: 99%

Energy transfer process and temperature‐dependent photoluminescence of PbS quantum dot‐doped glasses

et al. 2018

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“…Below 75 K, it again enhances till 10 K (region I). The total PL intensity is governed by the combination of radiative and nonradiative processes [23] due to surface states. The dissociation of excitons and tunneling of charge carriers from NCs to non-radiative centers are responsible for PL quenching in regions I and III.…”

Section: (C) Along With the Relative Positions Of Fermi Level In Bulkmentioning

confidence: 99%

Anomalous photoluminescence enhancement due to hot electron transfer in core–shell Au–CdS nanocrystals

Kahane

Sudarsan

Mahamuni

2017

Journal of Luminescence

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“…Bi 2 O 3 shows four main structures that are denoted by α‐, β‐, γ‐, and δ‐Bi 2 O 3 6. The low‐temperature α‐phase and high‐temperature δ‐phase are stable, and the others are high‐temperature metastable phases 7. These special features explain the great effort devoted to the investigation of Bi 2 O 3 polymorphs over the last years.…”

Section: Introductionmentioning

confidence: 99%

Electrical and mechanical properties of bismuth oxide nanowire/poly(vinyl acetate)

Mahmoud

Al-Ghamdi

2010

J of Applied Polymer Sci

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Poly(vinyl acetate) (PVAc) loaded bismuth oxide (Bi 2 O 3 ) nanowires was successfully prepared at low temperature and ambient pressure. X-ray diffraction and transmission electron microscopy were used to characterize the final product. It was found that Bi 2 O 3 nanowires were formed and the diameter of the rods was confined to within 8 nm. The diameter and length of formed rods was found increase by increasing the bismuth oxide concentration in the PVAc matrix. The current-voltage (I-V) characteristic curves revealed that the charge transport is mainly nonlinear due to grain boundary contribution. The complex impedance spectroscopy was confirmed that the grain boundary effect controls the charge transport mechanism through nanocomposites. The deformation behavior after preparing the nanocomposites, irrespective of Bi 2 O 3 concentration, is similar to that of the unfilled elastomer, implying that the mechanism of large deformation is mainly governed by the matrix. The mechanical measurements confirmed that the bismuth oxide has rod-like shape.

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Identification of surface states in PbS quantum dots by temperature dependent photoluminescence

Cited by 39 publications

References 14 publications

Energy transfer process and temperature‐dependent photoluminescence of PbS quantum dot‐doped glasses

Energy transfer process and temperature‐dependent photoluminescence of PbS quantum dot‐doped glasses

Anomalous photoluminescence enhancement due to hot electron transfer in core–shell Au–CdS nanocrystals

Electrical and mechanical properties of bismuth oxide nanowire/poly(vinyl acetate)

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