Photoluminescence and far-infrared spectroscopy of PbS quantum dots – Polyvinyl alcohol nanocomposite

Kostić, R.; Romčević, M.; Romčević, N.; Kłopotowski, Ł.; Kossut, J.; Kuljanin-Jakovljević, J.; Čomor, Mirjana I.; Nedeljković, Jovan M.

doi:10.1016/j.optmat.2007.05.044

Cited by 21 publications

(12 citation statements)

References 22 publications

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“…The experimentally observed E g values for the shift indicated an alloying between nanocrystalline PbS. Such increase has been observed by other authors [19,20]. The E g for doped samples in the 2.4-3.8 eV range the large experimentally observed E g in the nanoparticle films theoretically estimated (using Vegar ds law) E g for bulk shows the extent of quantum size effect in the nanoparticle films.…”

Section: Resultssupporting

confidence: 83%

Properties of PbS: Ni²⁺ Nanocrystals in Thin Films by Chemical Bath Deposition

Moreno

Lima

Portillo

et al. 2012

ISRN Nanotechnology

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The growth of nanocrystalline PbS films by chemical bath deposition (CBD) onto glass at temperature T = 20 ± 2• C is presented in this research. We report on the modification of structural, optical, and electrical nanostructures due to in situ Ni-doping. The morphological changes of the layers were analyzed using SEM, AFM, and TEM. XRD spectra displayed peaks at 2θ = [26. 00, 30.07, 43.10, 51.00, 53.48], indicating growth on the zinc blende face. The grain size determined by X-rays diffraction of the undoped samples was ∼36 nm, whereas with the doped sample was 3.2-5 nm. By TEM, the doped PbS was found crystalline films in the range 3.5-5 nm. Optical absorption (OA), and forbidden bandgap energy (E g ) shift disclose a shift in the range 2.1-3.8 eV. Likewise, the dependence of E g with the radius size and interplanar distance of the lattice is discussed. Raman spectroscopy (RS) exhibited an absorption band ∼135 cm −1 displaying only a PbS ZB structure. The thermal energy for the films was determined from the slope of dark conductivity (DC) and the energy was estimated to be 0.15 to 0.5 eV.

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Section: Resultssupporting

confidence: 83%

Properties of PbS: Ni²⁺ Nanocrystals in Thin Films by Chemical Bath Deposition

Moreno

Lima

Portillo

et al. 2012

ISRN Nanotechnology

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“…The low energy PL band around 1.0 eV was observed by Yu et al [4] and was attributed to surface states. The high-energy band at 1.67 eV was observed by various groups [2,3,5,6] and was also attributed to defect states at the surface. At low temperature a new band appears at 1.33, and the 0.9 eV band resolves into two peaks.…”

Section: Introductionmentioning

confidence: 92%

“…Low temperature photoluminescence (PL) measurements on PbS nanoparticles in PVA are few with recent work reported by Kostic et al [2] and Kim et al [3]. Both works have not observed the PL bands at low energies (1.0 eV) and have reported the bands only above 1.2 eV.…”

Section: Introductionmentioning

confidence: 92%

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

Pendyala

Rao

2008

Journal of Luminescence

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“…Recently, studies on optical properties of doped PVA films have attracted the researcher's attention [14] in view of their application in many optical devices [15]. However, few photoluminescence investigations are done on PVA polymer [16].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence investigations and thermal activation energy evaluation of Fe3+-doped PVA films

et al. 2015

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In this work, we study the inclusion mechanism of Fe 3? ions in a polyvinyl alcohol (PVA) matrix. Pure and Fe 3? -doped PVA films, using FeCl 3 solution, are prepared by a solution casting method. The effect of Fe 3? doping on the photoluminescence (PL) behavior of PVA is investigated in the temperature range from 10 to 300 K. The PL intensity is found to decrease as the temperature increases for the samples slightly doped. This behavior is attributed to the phonon diffusion by the photo-created electron-hole pairs. However, this behavior is completely inverted when the content of Fe 3? increases. The first author has already published a work discussing the possible explanations of such a behavior where the PL intensity increases with temperature. This paper is devoted to study the thermal activations energy and its variation with doping. Therefore, the PL integrated intensity as a function of 1/T is simulated by the Arrhenius model for the samples whose PL intensity decreases with temperature. However, for the other samples, a model of two activation energies is used. The gap energy values and the PL spectra of all samples at 300 K were used to justify the suggested transitions.

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Photoluminescence and far-infrared spectroscopy of PbS quantum dots – Polyvinyl alcohol nanocomposite

Cited by 21 publications

References 22 publications

Properties of PbS: Ni²⁺ Nanocrystals in Thin Films by Chemical Bath Deposition

Properties of PbS: Ni²⁺ Nanocrystals in Thin Films by Chemical Bath Deposition

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

Photoluminescence investigations and thermal activation energy evaluation of Fe3+-doped PVA films

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Photoluminescence and far-infrared spectroscopy of PbS quantum dots – Polyvinyl alcohol nanocomposite

Cited by 21 publications

References 22 publications

Properties of PbS: Ni2+ Nanocrystals in Thin Films by Chemical Bath Deposition

Properties of PbS: Ni2+ Nanocrystals in Thin Films by Chemical Bath Deposition

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

Photoluminescence investigations and thermal activation energy evaluation of Fe3+-doped PVA films

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Properties of PbS: Ni²⁺ Nanocrystals in Thin Films by Chemical Bath Deposition

Properties of PbS: Ni²⁺ Nanocrystals in Thin Films by Chemical Bath Deposition