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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2015. V. 18, N 3. P. 309-311.
Electroluminescence powdered ZnS:Cu obtained
by one-stage synthesis
1V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine
41, prospect Nauky, 03028 Kyiv, Ukraine; *e-mail: Yuyu@isp.kiev.ua Abstract. Photo- and electroluminescence properties of ZnS obtained using self-propagating high-temperature synthesis and doped with Cu were studied in this work. It has been shown that high-temperature one-stage synthesis enables to obtain two-phase system ZnS-Cu2–xS with the maximum radiation 515 nm for photo- and electro¬luminescence. Since the synthesis process is non-equilibrium, impurities distribute non-uniformly in the bulk of microcrystals. Additional annealing and introducing the Ga co-activator lead to more non-uniform distribution of impurities in the bulk of microcrystals. It causes the increase in the intensity of the blue band in photoluminescence spectra and shift of the maximum of electroluminescence toward longer wavelengths. It is probable that this increase in the intensity of the blue band in photoluminescence spectra is caused by formation of the radiative centers Cui-CuZn. Keywords: electroluminescence, photoluminescence, zinc sulfide, self-propagating high-temperature synthesis.
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