Hybrid precursors synthesis and optical properties of LnNbO 4:Bi 3+ blue phosphors and Bi 3+ sensitizing of on Dy 3+'s luminescence in YNbO 4 matrix

Abstract

In this paper, Bi 3+ doped with LnNbO 4:Bi 3+ (Ln = La, Gd and Y) and YNbO 4:Bi 3+, Dy 3+ phosphors have been synthesized by a modified chemical co-precipitation process with hybrid precursors. Their micromorphology and particle sizes were characterized by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The photoluminescence data for LnNbO 4:Bi 3+ indicated that the emission peak positions for Bi 3+ showed red-shifts comparing to that of NbO 4 3− for undoped LnNbO 4 hosts. Besides this, it was found that Bi ion can enhance the emission intensity of Dy 3+ in YNbO 4 host lattice when the Bi ion concentration is lower than 3 mol%. Moreover, the influence of Bi 3+ concentration on the luminescent properties of YNbO 4 was examined, which shows that the optimum concentration was 1 mol% and concentration quenching occurred.