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The effect of Nb codoping on the optical properties of the PbWO 4 :Mo scintillator is investigated by radio-and thermoluminescence, scintillation decay, and light yield measurements. Steady-state radioluminescence efficiency of PbWO 4 :Mo,Nb with optimized doping concentrations ͑2750 and 350 molar ppm, respectively͒ becomes up to 20 times higher with respect to that of undoped PbWO 4 and is comparable to that of Bi 3 Ge 4 O 12 . However, slow components down to several tens of microseconds appear in the time decay. Their existence may be related to the presence of traps monitored by thermoluminescence.

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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.

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