Individual glow bands of Mn2+ ions photoluminescence in plastically deformed ZnS single crystals

Prokofiev, T.A.

doi:10.15407/spqeo7.01.063

Semicond. Phys. Quantum Electron. Optoelectron.

2004

DOI: 10.15407/spqeo7.01.063

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Individual glow bands of Mn2+ ions photoluminescence in plastically deformed ZnS single crystals

T.A. Prokofiev¹

Abstract: The spectra of a photoluminescence (PL) in plastically deformed (PD) ZnS:Mn single crystals are investigated. It is shown that the PD processes cause change of a quantitative ratio between separate types of glow manganese centres (MC) as a result of their local symmetry rearrangement. After decomposing of PL integral spectra by individual PL bands using the cumulative distribution Gauss function, the nature of a ratio change between PL MC of different types is established. The individual with the peaking in th… Show more

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Cited by 3 publications

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Mechanism of photoluminescence excitation of Mn2+ ions in ZnS crystals

2005

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535.37The mechanisms of photoluminescence excitation of Mn 2+ ions in ZnS crystals have been investigated on the basis of complex analysis of the temperature dependences of the photoluminescence and photoluminescence-excitation spectra of ZnS:Mn crystals. The activation energy of a manganese luminescence center was estimated at E a = 0.17 0.05 eV. It is shown that E a represents an energy band with a width ∆E a = 0.1 eV, within which a manganese luminescence center can experience radiationless recombination.Keywords: temperature dependence of photoluminescence spectra, luminescence center of manganese, excitation spectrum, activation energy of manganese center, ZnS crystals.Introduction. Zinc sulfide crystals doped with Mn 2+ ions have long been studied. However, up to now, there has been no clear idea on the mechanisms of transfer of the excitation energy to different manganese centers (MC) of luminescence in zinc sulfide crystals exposed to temperature action or exciting radiation. At the same time, such information would allow one not only to predict the operation of various luminescent devices based on ZnS:Mn cryctals, but also to widen fundamental notions of the monomolecular-luminescence process as a whole.An our opinion, the indicated problems can be solved by investigating, in complex, the photoluminescence and photoluminescence-excitation spectra of ZuS:Mn crystals with different concentrations of an activator at different exciting-radiation energies and temperatures.Samples and Experimental Procedure. ZnS:Mn crystals grown from a melt under an argon pressure by the Bridgman-Stockbarger method [1] were investigated. The concentration of Mn 2+ ions in a mixture was equal to C Mn = 1⋅10 −4 -5⋅10 −2 g of MnS/g of Zn (hereinafter g/g). As the exciting radiation sources, we used LGN-517 lasers with a radiation wavelength λ exc = 441 nm corresponding to the absorption band of Mn 2+ ions in ZnS crystals and

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Mechanism of photoluminescence excitation of Mn2+ ions in ZnS crystals

2005

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Temperature dependence of photoluminescence and electroluminescence of ZnS:Mn crystals

et al. 2006

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535.37:548By means of comprehensive analysis of the temperature dependences of the photoluminescence for ZnS:Mn crystals, we have observed persistent changes in the intensity, shape, and position of the maximum in the emission spectrum associated with changes in the immediate environment of the manganese luminescence centers. We have also observed inflection points on the voltage vs. brightness characteristics of the samples, the position of which depends on the frequency of the exciting voltage and the temperature. The observed dependences are explained using concepts describing the mechanisms of pre-breakdown luminescence.Introduction. The complex structure of the "manganese" emission band in ZnS:Mn crystals, associated with different local environments of the Mn 2+ ions in the crystal lattice [1-3], means complex temperature dependences of the optical characteristics of ZnS. In this work, we studied the effect of temperature on the intensity of emission for photoluminescence (PL) and electroluminescence (EL) of ZnS:Mn single crystals.Samples and experimental procedure. Samples of the crystals were grown from the melt under argon pressure. The salt α-MnS was used as the activator. The original crystals with microtwinned structure and cubic 3C symmetry consisted of microblocks misoriented relative to each other by 2-3 o . For excitation of photoluminescence, we used LGI-505 and LGN-517 lasers with wavelengths of λ ex = 337 nm and 441 nm, which in the first case corresponds to intrinsic absorption of ZnS and in the second case corresponds to one of the absorption bands of the Mn 2+ ion in the ZnS crystals, associated with the transition 6 A 1 ( 6 S) →

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Localization of nonequilibrium current carriers close to Cr ions in ZnSe:Cr single crystals

Colibaba¹,

Nedeoglo²

2009

Journal of Luminescence

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Individual glow bands of Mn2+ ions photoluminescence in plastically deformed ZnS single crystals

Cited by 3 publications

References 11 publications

Mechanism of photoluminescence excitation of Mn2+ ions in ZnS crystals

Mechanism of photoluminescence excitation of Mn2+ ions in ZnS crystals

Temperature dependence of photoluminescence and electroluminescence of ZnS:Mn crystals

Localization of nonequilibrium current carriers close to Cr ions in ZnSe:Cr single crystals

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