Further, ferroelectricity is necessarily suppressed below a critical dimension due to the substantial scaling effect . However, this leads to the establishment of internal electric fields (IEFs) between the positive and negative potentials in close proximity to the surface . Thickness at the nanoscale controls the internal electric field inside the lattice, which depends on the depolarization Lanthanide ions (Ln 3+ ) doped luminescent phosphor materials have generated immense recognition as phosphors due to their unique, and tailored optical properties, making them suitable for a wide range of applications, including display devices , solid-state lasers , light-emitting devices (LED) , optical communication , solar cells , fluorescent labels for biomolecule detection , cell imaging , catalysis , medical diagnosis , and so forth. The luminescence in these materials is a result of parity forbidden intra-configurational transition in the Ln 3+ ions . Previous research has shown that matrices embedded with Eu 3+ ions display Stokes luminescence, marked by the release of lower energy light after being exposed to higher energy light from the doped Eu 3+ ions. The glowing characteristics resulting from shifts between energy states 5 D0 and 7 FJ (J = 0 to 4) can be employed to explore the crystal field and coordination surroundings surrounding the Eu 3+ ion in its host structure . The interaction between Ln 3+ ion-doped fluorides and oxides with various inorganic hosts has been extensively studied . However, the potential of oxyhalides as hosts for lanthanides has been less explored .