Excitonic emission of scheelite tungstates AWO4 (A=Pb, Ca, Ba, Sr)

Luminescence rise time in self-activated PbWO4 and Ce-doped Gd3Al2Ga3O12 scintillation crystals

“…Figure 1 shows a typical image of the photoluminescence intensity dependence on time and wavelength, which was obtained with the streak camera for the PWO sample under study. of approximately 700-800 ps is consistent with that reported in [19], while the fast component has not been observed before. The comparison of the PL transients measured at different excitation intensities (see Fig.…”

“…Therefore, the intermediate decay component (600-800 ps) and the component with the decay time of 8-10 ns, originating from regular WO4 2-complexes [19], provide simultaneous contributions to luminescence, which is strongly quenched at room temperature. The PWO crystals fabricated on a large scale for high energy physics applications are doped with trivalent La and Y ions at the total level of 100 ppm [12].…”

Time-resolved luminescence from Jahn-Teller split states of self-trapped excitons inPbWO4

“…Similar blue-shift of the triplet luminescence band with increasing T has also been observed in other tungstates such as CdWO 4 25) and CaWO 4 . 26) It has been found 27) that the STE luminescence (probably, the main band II) of PWO shows an order of magnitude increase of the decay time at very low temperatures (T < 5 K).…”

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

“…To describe I(T) and τ(T) dependences of the B emission by a phenomenological model, two thermally stimulated processes were considered in [35]: the intracenter thermal quenching characterized by the activation energy E q = 0.2 eV and frequency factor w = 10 12 s -1 and the exciton state disintegration with E a = 0.1 eV and w = 10 9 s -1 . The activation energy values are in good agreement with the values 0.20-0.21 eV and 0.075 ± 0.005 eV obtained in the present paper.…”