Crystal structure and luminescence properties of CaTiO3:Dy3+ phosphor co-doped with Zr4+.

A series of Ca(Ti 1− x Zr x)O 3 :Dy3+ phosphors were fabricated using a combustion method. The lattice structure, morphological features, and luminescence performances of the specimens were obtained. Rietveld refinement of the XRD patterns confirmed the crystal distortion of CaTiO 3 after Zr4+codoping and the positional occupation of Zr4+ in the CaTiO 3 crystal lattice. The photoluminescence spectroscopy results indicated that the fluorescence emission intensity of CaTiO 3 :Dy3+ was substantially enhanced by Zr4+ codoping and that the optimum doping concentration of Zr4+ was 40% mol. The quantum yield of the Ca(Ti 0·6 Zr 0.4)O 3 :Dy3+ phosphor was measured to be 9.9%, and its fluorescence lifetime decreased with the increasing concentration of Zr4+ doping. Furthermore, the lowest color temperature was observed for Ca(Ti 0·6 Zr 0.4)O 3 :Dy3+ among the investigated phosphors and its color coordinate was the closest to the standard white-light color coordinate. These results suggest that the Ca(Ti 0·6 Zr 0.4)O 3 :Dy3+ phosphor excited by near-ultraviolet light is a potential material for application in white light-emitting diodes. • The lattice parameters changes after incorporation of Zr4+ into CaTiO 3 :Dy3+. • The XRD structural refinement certificated the rationalization of Zr4+ substitute Ti4+ in CaTiO 3 :Dy3+ structure. • The fluorescence properties enhanced after Zr4+ doping. [ABSTRACT FROM AUTHOR]