Photoluminescence properties of green emitting CaY2Al4SiO12:Tb3+ garnet phosphor

The photoemission properties of a microcrystalline-powder Tb3+-doped CaY2Al4SiO12 garnet phosphor were studied. The microcrystalline materials were obtained using the sol-gel method that yields chemically homogeneous and microparticle-sized powders. X-ray powder diffraction (XRPD) and scanning electron microscope (SEM) analyses were used to reveal the crystallinity, crystal structure, and surface morphology of the prepared CaY2Al4SiO12:Tb3+ garnet phosphor. The samples showed a green-emission characteristic at around 544 nm with an excitation at 271 nm. A concentration quenching was observed with the increasing of the Tb3+ concentration. The effect of the Tb3+ doping and the photoluminescence properties were also investigated, leading to the proposal of a feasible interpretation by the authors.