Investigation of luminescence and capture centers in magnesium and zinc tungstates

Electron capture centers and hole luminescence centers are considered. Models are proposed for the luminescence centers responsible for the radiation from the crystals investigated, in the region 480–650 nm, and also the corresponding radiation mechanisms.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 43–46, March, 1978.In conclusion, we express our deep gratitude to O. O. Glazunov and Yu. P. Tsaregorodtsev for obtaining the XL and KTL spectra and for interest in this work.     

Destruction mechanism of color centers and recombination luminescence in NaCl-Cd crystal phosphors

The authors have studied the origin of integral thermoluminescence peaks and the destruction mechanism of color centers during thermal relaxation of X-irradiated NaCl-Cd phosphors. The luminescence spectra have also been studied, and previous similar results are discussed.     

Electronic states on the surface of zinc sulfide crystal phosphors

An optical method of heterogeneous spectroscopy of the surface has been developed, which makes it possible to determine the energy position of electronic states on the surface itself of wideband solid bodies. The method is based on a new phenomenon discovered by us which is a highly efficient heterogeneous electronic accommodation of the energy of heterogeneous chemical reactions; it consists specifically in an increase, by 3–5 orders of magnitude, in the rate of generation of electrons by reaction energy to the C-zone of a crystal existing in the metastable state as compared with an unexcited specimen. We have determined the energy denths of electronic states that participate in accommodation of the reaction energy of heterogeneous recombination of atoms for a large number of zinc sulfide crystal phosphors. Priazov'e State Technical University, 7 Respublika By-str., Mariupol', 341000, Ukraine; e-mail: shalamov@pstu.edu. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 6, pp. 809–813, November–December, 1999.     

Sputtering of zinc sulfide phosphors in excitation of radical-recombination luminescence by atomic hydrogen

Treatment of zinc sulfide phosphors in atomic hydrogen not only produces radical-recombination luminescence (RRL) but also sputtering of the phosphor. The sputtering rate has been estimated for FKP-03k powder phosphor at various temperatures. The atomic hydrogen produces defects of etch-pit type on the surface of a single crystal. The long-term response of the RRL has been recorded for the FKP-03k phosphor and it is ascribed to the sputtering.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 107–110, March, 1975.     

Self-activated luminescence of zinc sulfide

The nature of the luminescence of zinc sulfide in the spectral range (360), 380–420 nm (SAL) at 80K is analyzed. It is shown that the appearance of SAL radiation is accompanied by additional absorption in the region (350) 365–370 nm at 80K. The low-temperature spectra of sphalerite, exposed to different radiation and subjected to different treatment, are studied. The multiband luminescence of the isoelectronic sulfur impurity in ZnO deposits in the region 383–640 nm is discussed. It is concluded that SAL luminescence is attributable to the localization of excitons in ZnS on clusters, whose formation precedes the precipitation of the ZnO·S phase. The formation of oxygen clusters and deposits on dislocations in ZnS is studied.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 60–66, February, 1987.     

Trigonal chromium centers in zinc sulfide

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 50, No. 4, pp. 624–627, April, 1989.     

Excitation spectra and structure of luminescence centers of manganese ions in single crystals of zinc sulfide

We investigate the photoluminescence excitation spectra in ZnS:Mn single crystals at room temperature and at the temperature of liquid nitrogen with a different concentration of Mn²⁺ ions. The strongest bands peaking at 557, 578, 600, and 637 nm are associated with a different position of the Mn ion in the lattice of the crystals under investigation. The difference obtained in the excitation spectra can be explained by the resonance transfer of energy between the Mn ions. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 2, pp. 208–210, March–April, 2000.     

The decay kinetics of radical-recombination luminescence in crystal phosphors

The features of the decay kinetics of radical-recombination luminescence (RRL) in crystal phosphors excited by atomic hydrogen have been studied. It is shown that the kinetics of the RRL decay can be determined both by the processes in the gas phase (decrease in the hydrogen-atom concentration as a result of their recombination at the walls of the reaction vessel after the atom-generation source has been switched off) and by the processes in the solid itself. Some conclusions are drawn concerning the mechanism of recombination for the RRL of the experimental phosphors.Translated from Izvestiya VUZ. Fizika, No. 12, pp. 16–19, December, 1973.