Investigation of temperature-dependent of (Y_2.94-xGd_xCe_0.06) Al₅O₁₂ phosphors

We present the influences of Gd³⁺ co-doping and temperature on the photoluminescent spectra of (Y_2.94-xGd_xCe_0.06) Al₅O₁₂ phosphors. The luminescence wavelength is shifted from 530 nm to 550 nm by addition of the Gd³⁺ increasing from 0 to 0.6 mol, at room temperature. The peak intensity shows the normal redshift with broadening bandwidth and decreasing emission intensity as increasing in temperature. With the increasing of Gd³⁺ doping, the declining rate and dilated trend are aggravated. The redshift behavior can be described in terms of the level splitting between ground state and excited state because of the relative larger radius and more negative of the Gd³⁺ than that of the Y³⁺ based on the configuration coordination model. The formula explanation is due to the dominant electron-phonon interaction for thermal decay and bandwidth broadening.