Preparation and Photoluminescence Performance of Eu3+ Doped La3Sc2Ga3O12 Red-emitting Phosphors

A series of Eu3+-activated La3Sc2Ga3O12 garnet phosphors were prepared via a high-temperature solid-state reaction. Spectroscopic characterization confirms that the as-synthesized phosphors can be efficiently excited by 393 nm near-ultraviolet radiation, and their luminescence intensity is dominated by the characteristic emission arising from the 5D0→ 7F1 transition of Eu3+ ions.According to the calculated Judd–Ofelt (J–O) intensity parameters, only marginal variations are observed for Ω2 and Ω4. This behavior indicates that the doped Eu3+ ions preferentially occupy high-symmetry lattice sites, thereby establishing magnetic dipole transitions as the dominant radiative relaxation pathway. Concurrently, it suggests that the structural rigidity of the host lattice remains virtually unperturbed upon Eu3+ incorporation. Under thermally induced luminescence quenching, the sample with a Eu3+ doping molar fraction of 0.15 retains 69.8% of its room-temperature emission intensity upon heating to 498 K. This substantial retention of luminescence intensity demonstrates the excellent thermal stability of the as-prepared phosphor. Furthermore, the internal quantum yield of this sample is determined to be 46.9%.