To examine scintillation response of piezoelectric crystals the
241Am 5.5 MeV
伪-ray excited emission spectra of lan
gasite family crystals, LGS (La
b>3b>Ga
b>5b>SiO
b>14b>), LNGA (La
b>3b>N
bb>0.5b>Ga
b>5.3b>Al
b>0.2b>O
b>14b>) and LTGA (La
b>3b>Ta
b>0.5b>Ga
b>5.3b>Al
b>0.2b>O
b>14b>) were measured. Dominatin
g emission
bands were o
bserved at 378 nm for LGS, 556 nm for LNGA and 425 nm for LTGA. X-ray excited radioluminescence intensity of these crystals was quantitatively compared with BGO standard scintillator. Photoluminescence 2D-spectra were measured as well and compared with radioluminescence ones. In LTGA also photoluminescence decays were measured for two dominant contri
butin
g emission centers.
Observed emission bands within 300-360 nm and beyond 400 nm most probably belong to self-trapped or trapped excitons and lattice defects, respectively.