Temperature behavior of X-Ray luminescence spectra of ZnSe

Abstract

In the given paper, the temperature dependences ([Formula: see text]–300 K) of the green band intensity at wavelengths [Formula: see text] nm and [Formula: see text] nm have been measured and observed, respectively, from the polished and unpolished surface (PS and unPS) of a polycrystalline CVD (chemical vapor deposition) ZnSe sample upon excitation by X-ray quanta ([Formula: see text]. In both cases, the activation energy of thermal quenching has been determined, and the reasons for thermal quenching have been considered in detail. Along with XRL spectra analysis, the temperature behavior of the green band observed upon excitation by an ultraviolet (UV) laser (He–Cd, [Formula: see text] nm) from the PS and unPS in the temperature range [Formula: see text]–200 K has been discussed in more detail.

Temperature Behaviour of the EPR Spectrum of Polycrystalline ZnSe

“…According to the results of xray phase analysis of the studied sample, zinc selenide is polycrystalline, and analysis of the x-ray reflection intensity shows the presence of a predominant direction in the crystal, as well as the Analysis of the obtained results shows the surface homogeneity, but with a change in stoichiometry within the ZnSe homogeneity region towards an excess of selenium (Fig. 2) [6].…”

“…In recent years, the role of oxygen and the influence of the sample surface on the optical properties of A II B VI crystals, including the luminescence processes observed in these materials, have been intensively studied [1][2][3][4][5][6][7][8][9][10]. This is because the long-wavelength emission bands observed in these crystals are impurity-defect luminescence spectra, the study of the properties of which is necessary for modern optoelectronics operating in the blue-green and red regions of the spectrum [1,4].…”

“…[6][7][8][9][10], where photoluminescence has been studied from a polished and unpolished sample surface (in both cases, in the same sample, there is the same excitation); some difference has been observed in the spectra, and it was considered that this difference is due to the uneven distribution of background impurities (they can be called uncontrolled impurities) over the depths of the sample. The temperature behaviour of the intensity of the green band under UV excitation (325 nm), observed from the polished and unpolished sample surfaces in the temperature range of 80-180 K, is different, and a similar behaviour has been observed upon excitation by x-rays, where the quantum energy is of 12 keV [6,8]. The authors of Refs.…”