Novel Te doping in Y2O3–Al2O3 system phosphor

Te doped Yttrium-aluminum (Y 2 O 3 –Al 2 O 3 ) system powders were synthesized by solid-state method. The structure and optical properties were investigated by XRD , SEM, XPS and PL. XRD analysis indicated that the samples transform from YAM, YAP to YAG phase as the sintering temperature rises. The samples sintered below 1200 °C have a broad emission centered at 604 nm with a lifetime up to 13.33 μs under room temperature. While in the mix phase of YAP and YAG, a sharp and intense emission peak centered at 715 nm was monitored with a lifetime up to approximate 2.76 ms. Moreover, the band structure and density of states for Te doped YAGwere investigated by first-principle calculations.