The Influence of Annealing in Zinc Vapor on the Visible and Mid-IR Luminescence of ZnSe:Fe 2+
- PDF / 1,978,610 Bytes
- 7 Pages / 612 x 792 pts (letter) Page_size
- 106 Downloads / 165 Views
R PHYSICS AND LASER OPTICS
The Influence of Annealing in Zinc Vapor on the Visible and Mid-IR Luminescence of ZnSe:Fe2+ A. V. Boryakova, A. A. Gladilinb, N. N. Il’ichevb, V. P. Kalinushkinb, S. A. Mironovb, *, R. R. Rezvanovc, O. V. Uvarovb, V. P. Chegnovd, O. I. Chegnovad, M. V. Chukicheve, and A. A. Shiryaev f a Lobachevsky
b
Nizhny Novgorod State University, Nizhny Novgorod, 603950 Russia Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, 119991 Russia c National Nuclear Research University MEPhI, Moscow, 115409 Russia d Research Institute of Materials Science, Zelenograd, Moscow, 124460 Russia e Faculty of Physics, Moscow State University, Moscow, 119991 Russia f Alekseev Nizhny Novgorod State Technical University, Nizhny Novgorod, 603950 Russia *e-mail: [email protected] Received January 14, 2020; revised July 4, 2020; accepted July 16, 2020
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. Keywords: ZnSe:Fe, ZnSe:Te, cathodoluminescence, X-ray fluorescence analysis, two-photon confocal microscopy DOI: 10.1134/S0030400X20110089
INTRODUCTION Iron-doped zinc selenide crystals are used as active elements of tunable mid-IR (3.6–5 μm) lasers [1]. To date, record-high lasing characteristics of ZnSe:Fe lasers are achieved upon pumping by Er:YAG lasers and electric-discharge HF lasers [2–4]. However, it is hardly possible to create a compact highly efficient laser system using these pumping methods. In recent years, other ways of creating population inversion in iron ions, for example, by impact ionization by hot (with energies of several keV) electrons (cathodoluminescence (CL)) have been sought. The spectral characteristics of CL of ZnSe:Fe diffusion structures in the mid-IR range (3.6–4.4 μm) under irradiation by a 40keV electron beam were studied for the first time in [5]. It was shown that the CL spectrum in this range coincides with the optically excited spectrum and belongs to the radiative transition between the levels of intracenter states 5T2 and 5E of Fe2+ ions. The influence of iron concentration on the CL characteristics of ZnSe:Fe in the mid-IR region was studied in [6], in which the maximum CL intensity was observed in structures with iron concentrations of about 0.8 wt %. The influence of annealing of ZnSe:Fe single crystals in zinc vapor on their luminescence characteristics was studied in [7]. In particular,
it was reported about partial recovery of interband luminescence in the regions of these crystals with high iron concentrations. The aim of the present work is to study the influence of annealing i
Data Loading...
