Luminescence of Ce3+ and Pr3+ doped Sr2Mg(BO3)2 under VUV-UV and X-ray excitation

This report presents the luminescence properties of Ce3+ and Pr3+ activated Sr2Mg(BO3)(2) under VUV-UV and X-ray excitation The five excitation bands of crystal field split 5d states are observed at about 46 729 44 643 41 667 38 314 and 29 762 cm(-1) (ie 214 224 240 261 and 336 nm) for Ce3+ in the host lattice The doublet Ce3+ 5d -> 4f emission bands were found at about 25 840 and 24 096 cm(-1) (387 and 415 nm) The influence of doping concentration and temperature on the emission characteristics and the decay time of Ce3+ in Sr2Mg(BO3)(2) were investigated For Pr3+ doped samples the lowest 5d excitation band was observed at about 42017 cm(-1) (238 nm) a dominant band at around 35714 cm(-1) (280 nm) and two shoulder bands were seen in the emission spectra The excitation and emission spectra of Ce3+ and Pr3+ were compared and discussed The X-ray excited luminescence studies show that the light yields are similar to 3200 +/- 230 and similar to 1400 +/- 100 photons/MeV of absorbed X-ray energy for the samples Sr1 86Ce0 07Na0 07Mg(BO3)(2) and Sr1 82Pr0 09Na0 09Mg(BO3)(2) at RT respectively (C) 2010 Elsevier B V All rights reserved