Local structures of Lu atoms in a core⿿shell approach for synthesis of Lu2SiO5 phase

Abstract

Single-phased Lu2SiO5:Ce3+ (LSO:Ce) phosphors with primary particle size of about 250nm were synthesized by a core⿿shell approach. Microstructure observation on the LSO:Ce precursor powders with core⿿shell structure demonstrates that considerable contact area between core (SiO2) and shell (Lu2O3) decreases the migration resistance between SiO2 and Lu2O3, which is very favorable to the formation of Lu2SiO5 phase. Phase evolution investigation of the powders indicates the phase transformation processes of the precursors is amorphous Lu(OH)3⿿Lu2O3⿿Lu2SiO5. Emission spectrum of LSO:Ce phosphors present a broad emission band centered at 396nm owing to allowed 5d⿿4f transition of Ce3+.