Emission analysis of RE3+ (Dy3+ or Tb3+):Ca3Ln(double bond; length as m-dashY,Gd)(VO4)3 powder phosphors

This paper reports on the photoluminescence results of Dy3+ or Tb3+ ions in Ca3Ln(double bond; length as m-dashY,Gd)(VO4)3 powder phosphors. Emission spectra of Dy3+:Ca3Ln(double bond; length as m-dashY,Gd)(VO4)3 powder phosphors have shown blue emissions (4F9/2 → 6H15/2) at 481 nm, yellow emissions (4F9/2 → 6H13/2) at 572 nm and a weak red emissions (4F9/2 → 6H11/2) at 661 nm upon excitation with λexci = 310 nm (6H15/2 → 4L19/2). Similarly photoluminescence spectra of Tb3+:Ca3Ln(double bond; length as m-dashY,Gd)(VO4)3 have shown green emissions (5D4 → 7F5) at 545 nm with λexci = 312 nm. For these phosphors XRD, FTIR, SEM and EDAX measurements have also been carried out.