2020, Boryakov, A. V., Gladilin, A. A., Il'ichev, N. N., Kalinushkin, V. P., Rezvanov, R. R., Резванов, Ренат Рашитович

© 2020, Pleiades Publishing, Ltd.Abstract: The influence of annealing in zinc vapor on the impurity-defect composition and the IR cathodoluminescence (CL) of ZnSe:Te plates diffusion-doped with iron is studied. Formation of precipitates on twin boundaries is found. It is shown that annealing of structures with surface iron concentrations exceeding 1 at % in zinc vapor leads to a significant increase in the IR CL intensity. It is found that interband luminescence in the regions with high iron concentrations is partially restored as a result of annealing.

2019, Gladilin, A., Uvarov, O., Il'ichev, N., Mirinov, S., Rezvanov, R., Резванов, Ренат Рашитович

© 2019 The Author(s)The influence of iron concentration and annealing process with Zn atmosphere on mid-IR kinetics and luminescence intensity of ZnSe crystal doped with iron excited by hot electrons were demonstrated. The mechanisms of excitation are discussed.

2019, Kalinushkin, V. P., Klechkovskaya, V. V., Klevkov, Y. V., Chukichev, M. V., Rezvanov, R. R., Резванов, Ренат Рашитович

The effect of thermal treatment in zinc vapor on the stoichiometry, defect and impurity structure, and activator cathodoluminescence of ZnSe doped with iron by the thermal diffusion method has been studied. Using a variety of measurement methods, it is found that, on the one hand, the separate regions in which the edge luminescence intensity drops become larger. On the other hand, the stoichiometry is improved and the integrated luminescence intensity, as well as the activator luminescence intensity, increase. The data obtained agree with the general approach to the mechanism of the influence of thermal treatment on the properties of doped ZnSe.

2019, Chukichev, M., Chegnov, V., Chegnova, O., Mironov, S., Rezvanov, R., Резванов, Ренат Рашитович

© Published under licence by IOP Publishing Ltd.Integral intensity and kinetics dependences of cathodoluminescence of ZnSe:Fe crystals in mid-IR spectral range was studied. Concentration of iron varied from 0.01 to 14 wt.%. The experiments were carried out in 77 - 300 K temperature range. It is established that the luminescence pulse rise time is longer than excitation pulse at low iron concentration at 77 K temperature. The increasing ones lead to shortening of the luminescence pulse rise time, decreasing of the luminescence lifetime and increasing of the luminescence intensity in mid-IR. The annealed ZnSe:Fe concentration series in vapour Zn are reproduced the same trends. The nature of observed experimental effects is discussed.

2019, Gladilin, A., Uvarov, O., Il'ichev, N., Chegnov, V., Rezvanov, R., Резванов, Ренат Рашитович

© 2019 IEEEZinc Selenide crystals doped with Iron are promising material to be used as an active media in tunable mid-IR lasers (4 − 5 µm) [1]. The ZnSe:Fe lasing characteristics close to the theatrical maximum are obtained by optical excitation [2]. Nowadays other pumping methods are also being explored. Previously we have observed luminescence in the mid-IR spectral region with the maximum at the wavelength of 3.9 µm under electron-impact excitation. The present research is focused on the influence of annealing process in Zn atmosphere on defective-impurity compound (DIC) and intensity of mid-IR cathodoluminescence (CL). We studied DIC by two-photon confocal microscopy (TPCM) on Carl Zeiss LSM NLO 710 (commercially available equipment). The TPCM allows detecting edge luminescence (EL) (460-480 nm) and DIC (480 - 725 nm) as well as mapping luminescence distribution [3]. In the CL experiments, the crystals were excited by a pulsed electron gun with the accelerated electron energy of 36 kV [4]. A series of ZnSe single crystals doped with Fe by thermal diffusion from surface was subjected to the DIC and CL studies. The initial ZnSe plates were cut from boules grown from the melt by the Bridgman method with an addition of Tellurium. Iron concentrations varied from 0.01 to 14 wt.% as determined by XDR. The samples were observed by TPCM and CL before and after annealing in Zn atmosphere.