Optical and EPR spectroscopy of Zn:Cr:ZnSe and Zn:Fe:ZnSe crystals

• Published in: Optical materials Vol. 37; pp. 262 - 266
• Main Authors: Fedorov, V.V., Konak, T., Dashdorj, J., Zvanut, M.E., Mirov, S.B.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 01-11-2014; Elsevier
• Subjects: Augers; Bleaching; Chromium; Crystals; Decay; Doped-insulator lasers and other solid state lasers; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Ionization; Iron; Laser materials; Lasers; Optical materials; Optics; Physics; Transition metal solid-state lasers; Transition metals; Transition-metal-doped materials; Transition-metal-doped materials; Transition metal solid-state lasers; Laser materials; Rise time; Photoluminescence; Metal ion; Doped materials; Binary compounds; Zinc selenides; Chromium additions; Iron; Mid infrared radiation; Quantum yield; II-VI semiconductors; Ionization; Solid state lasers; Transition elements; Chromium; Optical materials; Iron additions; Auger recombination
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2014.06.004

•Strong bleaching of the divalent state of chromium and iron metals was studied.•The IR luminescence quantum yield was measured under photo-ionization excitation.•Excitation rate of the upper laser level under ionization transition was studied.•Cr charge transfer processes were studied using time-dependent photo-EPR method.
Optical and EPR characterization of Cr and Fe doped ZnSe crystals annealed in Zn vapor revealed a strong bleaching of the divalent state of transition metal ions. Photo induced EPR kinetics were studied in 20–80K temperature range. Analysis of time-dependent data reveals Cr1+ signal rise time decreases with increasing temperature. The non-exponential decay of Cr1+ concentration were analyzed using Auger-type recombination process. The photoluminescence quantum yield of Cr2+ ions at 5E(D)→5T2(D) mid-IR transition excited via chromium ionization process was measured to be close to 100%.