Judd-Ofelt analysis and temperature dependent upconversion luminescence of Er3+/Yb3+ codoped Gd2(MoO4)3 phosphor

Although lanthanide doped luminescent materials have been extensively investigated, a quantitative analysis of how temperature affects upconversion luminescence is still incomplete. The Gd2(MoO4)3:Er3+/Yb3+ phosphor is synthetized by sol-gel method. Based on the absorption spectra of Er3+ ions, J-O intensity parameters and radiative transition probabilities are computed to estimate the optical properties. In view of ion-phonon interaction, the phonon-assisted energy transfer and multiphonon relaxation are responsible for the temperature dependent luminescence. Additionally, cross relaxation probability for 4I11/2+4I11/2→4I15/2+4F7/2 is determined to be 240 s−1 through quantitative simulation of ion-ion interaction. These meaningful results are of vital values for the field of laser crystal and optical temperature sensing.