Energy Transfer and Defects Study in ${\rm Ce}^{3+}$, ${\rm Pr}^{3+}$ Co-doped ${\rm Lu}_{2}{\rm Si}_{2}{{\rm O}_7}$ Crystal

Lu
₂
Si
₂
O
₇
(LPS) single crystals doped with 0.05%Ce and co-doped with 0.05%Ce, 0.05%Pr were grown by floating zone method. The segregation coefficients of Pr and Ce in LPS host were estimated through ICP-OES method. The VUV-UV excitation and emission spectra at 150 K, X-ray excited luminescence, fluorescence decay time of Ce
³⁺
emission at room temperature and thermally stimulated luminescence (TSL) spectra of LPS:Ce and LPS:Ce,Pr were measured. The energy transfer from Pr
³⁺
to Ce
³⁺
in LPS host was observed through the VUV-UV spectra and possible transfer pathways are discussed. The luminescence intensity of Ce
³⁺
can be improved by about 20% after Pr
³⁺
co-doping. Defects in LPS host are studied through TSL spectra.