Novel Te doping in Y2O3–Al2O3 system phosphor

Te doped Yttrium-aluminum (Y2O3–Al2O3) 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.