Effect of pH on photoluminescence enhancement in Pb-doped ZnS nanoparticles

Borse, Pramod H.; Vogel, Walter; Kulkarni, Sulabha K.

doi:10.1016/j.jcis.2005.06.056

Cited by 40 publications

(20 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Fig. 6b, the PL intensity decreases at pH = 7.97 that may be linked to the pH dependence of Na + incorporated in the CdS matrix that can help to induce the required density of impurity states in the energy gap of CdS [21]. In both gures, two bands (A and B) are clearly observed in the range of 2.22.5 eV.…”

Section: Resultsmentioning

confidence: 87%

Effect of pH on the Optical Properties of Doped CdS (Cu, Fe) Nanoparticles Incorporated in TG as the Capping Agent

Hasanzadeh¹,

Shayesteh²,

Ziabari³

2014

Acta Phys. Pol. A

View full text Add to dashboard Cite

Cu and Fe doped cadmium sulde nanoparticles with controllable and relatively narrow size distribution were prepared using a facile and ecient wet chemical route by mixing the reactants in water solvent. It was found that the mixture pH plays an active role in the growth procedure of nanoparticles. Diverse physical properties of the prepared nanoparticles were investigated using UV-vis absorption, photoluminescence spectroscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. The average particle size of samples was estimated to be about 5 nm by using transmission electron microscopy measurement. The pH optimization study implies that pH ≈ 7 would yield an enhancement in photoluminescence intensity. There are two bands in photoluminescence spectra which related to deep and shallow traps.

show abstract

Section: Resultsmentioning

confidence: 87%

Effect of pH on the Optical Properties of Doped CdS (Cu, Fe) Nanoparticles Incorporated in TG as the Capping Agent

Hasanzadeh¹,

Shayesteh²,

Ziabari³

2014

Acta Phys. Pol. A

View full text Add to dashboard Cite

show abstract

“…The incorporation of Pb 2? into the ZnAl 2 O 4 matrix can be interpreted as a development of more new trapping centers [1]. For the emission from the Pb 2?…”

Section: Photoluminescence Analysismentioning

confidence: 99%

“…Doped and undoped semiconductor nanoparticles have received major interest in the scientific community because of their unique and superior properties, such as sizedependent optical properties [1]. ZnAl 2 O 4 is one of the wide-band gap (*3.8 eV) semiconductors being considered for the photoelectronic devices, UV-transparent conductor, sensor, and dielectric material [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effects of Pb2+ ions concentration on the structure and PL intensity of Pb-doped ZnAl2O4 nanocrystals synthesized using sol–gel process

Motloung

Dejene

Swart

et al. 2014

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

Undoped and Pb 2? -doped ultrafine cubic zinc aluminate (ZnAl 2 O 4 ) hosts were successfully prepared at a relatively low temperature (*80°C) using the sol-gel method. The concentration of Pb 2? was varied from 0 to 5 mol%. The TGA showed that the minimum annealing temperature required to obtain single phase ZnAl 2 O 4 must be above 400°C. The XRD data revealed that all the annealed samples were single phase crystalline structures and the estimated crystallites size were in the range of 21-30 nm in diameter. The FTIR results suggest that heattreating can destroy some of the bonds. The surface morphology of the phosphors was influenced by the Pb 2? mol%. Undoped and Pb 2? -doped ZnAl 2 O 4 nanoparticles exhibit the violet emission at slightly different positions. The slight peak shifts suggests the possibilities that the luminescence centre can either be due to the defects level in the host or Pb 2? ions. The emission peaks at 390 and 399 nm are ascribed to the typical UV transitions 3 P 0,1 ? 1 S 0 in Pb 2? ion. At the higher Pb 2? mol%, the luminescence quenching behaviour occurs, which suggests that doping with Pb 2? ions is accompanied by the introduction of new defect sites that enhance non-radiative recombination of the excited electrons.

show abstract

“…The industrial use of activated ZnS for over 70 years stimulated more profound study of its physical characteristics defining a variety of luminescent properties of this material [1][2][3][4][5][6][7]. Nowadays, properties of luminescent centers formed by copper [4][5][6][7][8][9] and other impurities [10][11][12][13] in ZnS have been studied so well that the behavior of impurity atoms in these crystals can be reliably monitored by fluorescent techniques.…”

Section: Introductionmentioning

confidence: 99%

Luminescent properties of fine-dispersed ZnS:Cu prepared using self-propagating high-temperature synthesis

Yu¹,

Lashkaryov²

2014

Semicond. Phys. Quantum Electron. Optoelectron.

View full text Add to dashboard Cite

Abstract. Fine-dispersed ZnS doped with Cu was prepared using self-propagating hightemperature synthesis. In the photoluminescence excitation spectra, the blue shift of the host lattice excitation peak is observed for powder ZnS:Cu that contains nano-and mesosized (submicron) particles. The obtained spectra indicate that radiative recombination in meso-sized particles is significantly reduced as compared to micro-sized particles, which can be caused by the increase of non-radiative relaxation processes in surface states.

show abstract

Effect of pH on photoluminescence enhancement in Pb-doped ZnS nanoparticles

Cited by 40 publications

References 28 publications

Effect of pH on the Optical Properties of Doped CdS (Cu, Fe) Nanoparticles Incorporated in TG as the Capping Agent

Effect of pH on the Optical Properties of Doped CdS (Cu, Fe) Nanoparticles Incorporated in TG as the Capping Agent

Effects of Pb2+ ions concentration on the structure and PL intensity of Pb-doped ZnAl2O4 nanocrystals synthesized using sol–gel process

Luminescent properties of fine-dispersed ZnS:Cu prepared using self-propagating high-temperature synthesis

Contact Info

Product

Resources

About