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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2016. V. 19, N 3. P. 303-306.
Influence of the presence of a fluxing agent
and its composition on the spectral characteristics of ZnS(Cu) obtained by self-propagating high-temperature synthesis
1V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine,
41, prospect Nauky, 03028 Kyiv, Ukraine
Abstract. Investigated in this work were the photoluminescence spectra and luminescence excitation spectra of powered ZnS:Cu, obtained using the method of self-propagating high-temperature synthesis (SHS) with addition of NaCl and MgCl2 as a fluxing agent into the charge and without them. It was shown that increasing the amount of fraction with the particle sizes ≤5 nm in powdered ZnS:Cu-SHS, where fluxing agents are present in the charge, is caused by the decrease in temperature inside the reactor in the course of the synthesis reaction. Besides, related increasing the intensity of the PL blue band with λmax ~ 450…465 nm in powdered ZnS:Cu-SHS/MgCl2, which is associated with redistribution of the copper impurity in the bulk of microcrystals, probably, occurring as a result of increasing the partial pressure of Cl during synthesis.
Keywords: self-propagating high-temperature synthesis, photoluminescence spectra, luminescence excitation spectra, fluxing agent, powered ZnS, copper impurity.
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