Synthesis of High-Performance YAG:Ce Phosphor Powder with Low Sintering Temperature and YAG:Ce-Doped Bi-B Glass by a One-Step Method

Ce-doped yttrium aluminum garnet (Ce:YAG) phosphor powder was synthesized with a precursor reaction at room temperature. The YAG phase appeared after sintering the precursor powder at 800 degrees C, and the intermediate phase disappeared when the annealing temperature was increased to 1000 degrees C. The morphology of Ce:YAG particles presented a spherical shape or a connected body and a minimum average grain size of about 41.6 nm. Using this improved sol-gel method, 10 at.% Ce-doped YAG with a high color rendering index was prepared, and cerium dioxide caused by concentration quenching was not found in the sample annealed at 900 degrees C. We utilized the powder to prepare a white light-emitting diode (LED) device, and the spectral data showed a good luminous effect. In addition, by utilizing precursor powders (instead of phosphors), we prepared YAG:Ce/Eu-doped Bi-B glass via a one-step method and briefly analyzed its optical properties.