Studies on luminescence properties and energy transfer in Ce/Dy co-doped CaS nano-phosphors

► Ce/Dy co-doped CaS nanophosphors were synthesized using solid state diffusion method. ► Structural characterizations were done using XRD and TEM. ► TEM image analysis of CaS:Ce0.50Dy0.50 shows nearly spherical particles with diameter varying between 50 and60 nm. ► One way energy transfer from Dy3+ to Ce3+ in CaS host has been investigated. ► The thermoluminescence of these nanophosphors has been studied for 0.5 Gy-21 kGy dose of gamma rays.