Thermoluminescence and lyoluminescence in γ-ray irradiated and Ce3+-doped YCa4O(BO3)3 phosphors

YCa 4 O(BO 3 ) 3 crystal having various concentration of Ce ions were synthesized by solid-state diffusion technique. XRD pattern of the sample confirmed the formation of the sample. Thermoluminescence (TL) and lyoluminescence (LL) of the γ-ray-irradiated sample were recorded. Two distinct peaks around 160 and 277 °C were observed in TL glow curves. TL intensity increased with increasing dopant concentration up to 2 mol%. A single sharp peak was observed in the LL glow curve of the sample. It was found that both TL and LL increased almost linearly with γ-ray doses up to 1.5 kGy. Photoluminescence (PL) of the sample was recorded to find the role of rare earth ion doped in YCa 4 O(BO 3 ) 3 . PL emission spectrum showed two peaks lying very close to each other around 390 nm which are characteristics of 5d → 4f transition of Ce 3+ ions. When LL of samples was recorded after removing the TL peaks it did not show any emission. This indicates that emission centres responsible for TL are also responsible for LL.