Optical Properties of Blue-Emitting Ce[sub x]Si[sub 6−z]Al[sub z−x]O[sub z+1.5x]N[sub 8−z−x] for White Light-Emitting Diodes

In this work, blue-emitting phosphors were synthesized by firing powder mixtures of , AlN, , and at for 2 h under 1.0 MPa . The resultant phosphors were characterized by phase identification, diffuse reflectance spectra, photoluminescence spectra, quantum efficiency, and temperature-dependent luminescence. The samples showed high purity at the overall range of the varied and values. A single broad emission band centered at about 486 nm at 410 nm excitation was observed. Moreover, the phosphors showed high thermal stability, which could sustain 79–88% emission intensity measured at room temperature. These results indicate that the phosphors are promising wavelength-conversion materials for white light emitting diodes (LEDs) using near-UV LED chips as the primary light source.