Luminescence, energy transfer and temperature sensing property of Ce3+, Dy3+ doped LiY9(SiO4)6O2 phosphors

A series of Ce(3+)and Dy3+ doped LiY9(SiO4)(6)O-2 phosphors was prepared by conventional high temperature solid state reaction method. The dominant emission of Dy3+ originates from the F-4(9/2) -> H-6(13/2 )(yellow emission) electric dipole transition while that of Ce3+ locates in the blue region. The concentration quenching for Dy3+ emission was investigated by luminescence spectra and decay curves, the main mechanism responsible for the energy transfer between Dy3+ ions was determined by the Inokuti-Hirayama model. Energy transfer from Ce(3+ )to Dy-3+ as well as the temperature sensing property was studied in detail. Thanks to the different thermal responses between Ce3+ and Dy3+ in the host, the highest sensing sensitivity was calculated to be 0.43% K-1. The results demonstrate that : LiY9(SiO4)(6)O2 : Ce3+, Dy3+ may be a potential candidate for a luminescent ratiometric thermometer.