Cu doped YCa4O(BO3)3 crystalline materials with variable particle sizes were amalgamated by solid-state diffusion technique. XRD pattern confirmed the creation of the material and therefore the numerous components and phases there in this material. Lyoluminescence (LL) of the gamma-ray-irradiated sample was proved.A single sharp peak was found within the LL glow curve of the sample.It is established that LL exaggerated nearly linearly with gamma- ray doses up to 1.5 kGy. Photoluminescence (PL) of the sample was recorded to search out the role of rare-earth ions. The PL emissionvary shows two peaks lying at 352 nm with 406 nm appointed to the 3d9 s1 ↔3d10 transition in Cu+ ions. Considerably, the reliance of LL of γ-ray-irradiated Cu doped YCa4O(BO3)3 phosphor on the particle size of the material has additionally been deliberated. The prepared phosphor might even be very important for sensing applications.