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Study on the photoluminescence of Cr3+and doping mechanism in F-codoped PbWO4single crystal

✍ Scribed by Li, Weifeng ;Long, Yumei ;Feng, Xiqi ;Zhao, Jingtai

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
337 KB
Volume
206
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

The influence of Cr^3+^ and F^–^ codoping on the defect structures in PbWO~4~ crystal is investigated by X‐ray diffraction and Fourier transform infrared (FTIR) spectroscopy and consequently a doping mechanism is proposed that the Cr^3+^ ions predominantly occupy the W^6+^ sites due to the help of F^–^. Photoluminescence (PL) spectra of PWO:Cr,F demonstrates in addition to the intrinsic luminescence from the PbWO~4~ crystal, a new sharp emission band at 15500 cm^–1^ can be observed even at room temperature and it may originate from the spin‐forbidden ^2^E β†’ ^4^A~2~ radiation of Cr^3+^ in a strong crystal field. It suggests that the F^–^ codoping makes a large contribution to the ^2^E β†’ ^4^A~2~ luminescence of Cr^3+^ in the scheelite‐structural PWO single crystal. (Β© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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In this paper, the absorption spectrum of PbWO 4 :Cr 3+ crystals is measured at room temperature in the wavelength range from 340 to 520 nm. The d-d transitions of Cr 3+ ions in PbWO 4 crystals with tetragonal symmetry are calculated by the crystal-field theory. The theoretical results are in good a