Spectroscopy, interaction with radiation

Photoelectric and luminescent properties of dysprosium-doped silver chloride

G. F. Novikov^a, E. V. Rabenok^a, K. V. Bocharov^a, N. V. Lichkova^b, O. V. Ovchinnikov^c, A. N. Latyshev<sup>c

a</sup> Institute of Problems in Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
^b Institute of Microelectronics Technology and High-Purity Materials RAS
^c Voronezh State University

Abstract: The influence of dysprosium doping on the photoelectric and luminescent properties of AgCl crystals is studied by methods of microwave photoconductivity and photoluminescence. Doping affects both the loss kinetics of photogenerated electrons and luminescence spectra and parameters of photostimulated burst of luminescence. It is shown that the charged [Dy$^{\bullet\bullet}_{\mathrm{Ag}}$ $\cdot$ $V'_{\mathrm{Ag}}]^\bullet$ or neutral [Dy$^{\bullet\bullet}_{\mathrm{Ag}}$ $\cdot$ 2$V'_{\mathrm{Ag}}]^x$ complexes are responsible for a new luminescence band peaked at 470 nm, which manifests itself at weight concentrations of the doping additive $>$ 10$^{-6}$%. The long-wavelength shoulder at 570 nm in the photoluminescence spectra is attributed to intracenter transitions in the Dy$^{3+}$ ions. The rate constant of the reaction of electron capture into the traps forming upon introduction of the dopant, $k_t$ = (3–5) $\times$ 10$^{-8}$ cm$^3$ $\cdot$ c$^{-1}$, is evaluated. It is assumed that the traps are Dy$^{3+}$ dysprosium ions.

Received: 14.07.2010
Accepted: 26.07.2010

 English version: Semiconductors, 2011, 45:2, 162–168

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