Complete characterization of doubly doped PbWO4:Mo,Y scintillators

Abstract

Synthesis, structure, and scintillation of Ce-doped gadolinium oxyorthosilicate nanoparticles prepared by solution combustion synthesisWe present correlated measurements of radioluminescence, photoluminescence, and thermoluminescence, as well as the measurements of decay kinetics both under ultraviolet and 22 Na͑511 keV͒ photon excitations for Mo-doped and doubly ͑Mo,Y͒-doped PbWO 4 single crystals. A wide concentration range of Mo doping ͑200-50 000 ppm͒ is covered. Y codoping results in significant suppression of trapping states induced by the Mo doping. Consequently, an improvement of temporal characteristics, such as acceleration of the scintillation decay process, of doubly doped material with respect to Y-free crystals, is achieved. For the optimum Mo concentration ͑2750-10 000 ppm͒, the temporal characteristics are fully comparable to an undoped PbWO 4 , while the light yield is increased by a factor of 2.2.

Localized excitons and defects in PbWO4 single crystals: a luminescence and photo‐thermally stimulated disintegration study

“…The origin of hole centers in PbWO 4 crystals is not still clear as they are not detectable by the ESR method [23][24][25][26][27][28]. As the hole counterparts serve as recombination centers, the spectral position of the TSL spectrum in each TSL peak can give information on the origin of the related hole centers.…”

Photosensitive bismuth ions in lead tungstate

“…These crystals were optimized for calorimet ric detectors by doping with trivalent ions [5,6]. Great progress in the enhancement of quantum yield was achieved by double doping of PWO crystals with Mo and La or Y and Nb ions [7][8][9][10]. This doping enhances the quantum yield by a factor of 2-4 without significant loss of other scintillation characteristics.…”

Optical and luminescence properties of CdWO4 and CdWO4:Mo single crystals

“…It is known that doping of another representative of tungstates, PbWO 4 , with molybdenum leads to a significant increase in the specific light yield at room temperature [6]. However, for cadmium tungstate doped with molybdenum, an insignificant decrease in the intensity of low-temperature intrinsic luminescence was previously found [7].…”

“…In this case, the intrinsic luminescence intensity at 2.46 eV decreases by more than two orders of magnitude. Thus, the presence of molybdenum impurity leads WO 6 6-not only to the formation of an additional low-energy luminescence band but also to quenching of the intrinsic luminescence of cadmium tungstate. Note that an insignificant decrease in the intrinsic luminescence intensity (to 30%) with an increase in the molybdenum concentration to 0.25 wt % in CdWO 4 was previously observed in [7] at the temperature T = 80 K. A possible reason for the more pronounced decrease in the intrinsic luminescence intensity with increasing molybdenum concentration, observed at 300 K, is the temperature quenching of intrinsic luminescence, which begins at 270 K.…”