Luminescence of Pr3+-doped garnet single crystals

Fabrication and photoluminescence characteristic of Pr:LuAG scintillator ceramics

“…5, two wide excitation band, 210-250 nm and 250-300 nm, which related to the two lowest 4f ( 3 H 4 )/5d 1,2 transition of Pr 3þ , similar with Pr:LuAG single crystals (Babin et al, 2007), also appears, the excitation within this band results in the structured emission with the dominant peak at 310 nm . It is worth nothing that, although in common viewpoint, ceramics would avoid anti site defects considering its comparably lower fabrication temperature , an apparent excitation peak located at round 178 nm was observed, it was attributed to the exciton perturbed by anti site defect in single crystal (Babin et al, 2005), further TSL measurement is necessary to clarify its origin.…”

“…However, to present, the anti site defects introduced during the high temperature growing process is still a problem (Babin et al, 2007). The Ga co-doping as Pr:Lu 3 (Ga, Al) 5 O 12 could release the anti site defect effect but it simultaneously degraded the luminescence properties (Ogino et al, 2007).…”

Thermoluminescence investigation of donor (Ce3+, Pr3+, TbYou1, Bos2, Shi3 et al. 2012Phys. Rev. B682130View full textAdd to dashboardCite

“…the energy difference between the bottom of the CB or mobility edge and the top of the valence band, can be estimated from the energy of the host exciton creation, which is about 6.95 eV. 28,29 To reach the mobility edge the binding energy of the exciton still needs to be added, which is estimated about 8% of the exciton energy resulting in E VC = 7.5 eV. The two CT energies therefore suggest that the GS of Yb 2+ and Eu 2+ are 0.4 eV deeper below the CB than as suggested by the TL activation energies.…”

Optical spectroscopy of Ca3Sc2Si3O12, Ca3Y2Si3O12 and Ca3Lu2Si3O12 doped with Pr3+

“…The inefficient energy transfer from host lattice electronic excitations in Pr 3 + -doped Ca 3 ), possibly related to the statistical occupation of the cationic sites by the Ca 2 + , Lu 3 + and Y 3 + ions. Such defects could generally play a significant role as quenching centres in oxides and particularly in garnets [18,19].…”

“…The position of these bands is similar to the corresponding ones observed in other garnets. The maxima of the 5d-4f emission bands are observed at 318 and 385 nm (31,450 and 25,970 cm À 1 ) for YAG:Pr 3 + and at 317 and 385 nm (31,450 and 25,970 cm À 1 ) for LuAG:Pr 3 + [13].…”