Luminescence study of pure and Fe- or Mo-doped ZnWO4 crystals

• ZnWO4, ZnWO4 : Fe and ZnWO4 : Mo crystals were investigated by the methods of time-resolved spectroscopy in the temperature range of 4.2-300 K. It is shown that the Mo and Fe impurities significantly reduce the light yield of ZnWO4. The main 2.5 eV emission of ZnWO4 and the 1.77 eV emission band of ZnWO4 : Mo are shown to originate from the triplet excited state of the WO6 and MoO6 complex, respectively. In ZnWO4 : Fe,Mo the MoO6 emission band is shifted to lower energies due to the perturbing influence of the iron impurity. No perturbing effect of Fe or Mo ions was observed for the main emission of ZnWO4 : Fe and ZnWO4 : Mo. The creation spectrum of self-trapped holes was measured for ZnWO4, ZnWO4 : Fe and ZnWO4 : Mo crystals in the energy region of 4-30 eV. (C) 2004 Elsevier Ltd. All rights reserved.

Ämnesord

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Nyckelord

triplet states

decay kinetics

ZnWO4

scintillators

self-trapped holes

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