Preparation and luminescence properties of Li2.06Nb0.18Ti0.76O3:Eu3+ phosphors

Abstract

New red phosphors with compositions of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3: [Formula: see text]Eu[Formula: see text] ([Formula: see text]–4[Formula: see text]wt.%) were prepared by using solid-state reactions. The phase structure and photoluminescence (PL) properties were studied as functions of synthetic temperature and Eu[Formula: see text] concentration. With the increase of synthetic temperature and Eu[Formula: see text] concentration, both the characteristic peaks of the excitation spectra monitored at 612[Formula: see text]nm and emission spectra excited at 396[Formula: see text]nm were remarkably enhanced. The intensity of peaks reaches a maximum when the content of Eu[Formula: see text] increases to [Formula: see text][Formula: see text]wt.% at 950∘C, Chromaticity Coordinate (CIE) of samples superior to the commercial red phosphors Y2O3:Eu[Formula: see text]. The internal quantum efficiency (QE) of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3:3[Formula: see text]wt.%Eu[Formula: see text] was 49.5%. These features show promising applications for near-ultraviolet (near-UV) chips-based LEDs.