X-ray excited luminescence spectra, wavelength-resolved thermoluminescence glow curves, ultraviolet and 22Na excited emission decays, and 60Co excited light yield were measured on a set of high purity ~99.9999%! PbWO4:X (X5Lu31, Y31, Gd31, Sc31, Nb51, Pb21) samples grown in an equivalent way. Positive influence of trivalent doping ~Lu, Gd,Y! was noted, which consists in suppressing the deeper trapping states in the PbWO4 structure. Such states are related to the radiative recombination processes in the green and red part of the spectra. The presence of the green emission centers also results in the increase of the slow recombination decay components in the microsecond time scale. High concentration of the dopant ions ~670 atomic ppm for PbWO4:Nb) results in the creation of new nonradiative recombination sites, which suppress the recombination decay components and the light yield as well.
Nikl, M., Boháček, P., Mihóková, E., Martini, M., Meinardi, F., Vedda, A., et al. (2000). Influence of doping on the emission and scintillation characteristics of PbWO[sub 4] single crystals. JOURNAL OF APPLIED PHYSICS, 87(9), 4243-4248 [10.1063/1.373060].
Influence of doping on the emission and scintillation characteristics of PbWO[sub 4] single crystals
MARTINI, MARCO;MEINARDI, FRANCESCO;VEDDA, ANNA GRAZIELLA;
2000
Abstract
X-ray excited luminescence spectra, wavelength-resolved thermoluminescence glow curves, ultraviolet and 22Na excited emission decays, and 60Co excited light yield were measured on a set of high purity ~99.9999%! PbWO4:X (X5Lu31, Y31, Gd31, Sc31, Nb51, Pb21) samples grown in an equivalent way. Positive influence of trivalent doping ~Lu, Gd,Y! was noted, which consists in suppressing the deeper trapping states in the PbWO4 structure. Such states are related to the radiative recombination processes in the green and red part of the spectra. The presence of the green emission centers also results in the increase of the slow recombination decay components in the microsecond time scale. High concentration of the dopant ions ~670 atomic ppm for PbWO4:Nb) results in the creation of new nonradiative recombination sites, which suppress the recombination decay components and the light yield as well.
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