Host-sensitized luminescence properties of KLa5O5(VO4)(2):Eu3+ for solid-state lighting applications

摘要

A novel KLa5O5(VO4)(2) blue-emitting phosphor was synthesized and studied in this paper. The introduction of Eu3+ at various concentrations into the host crystal structure is possible through solid-state synthesis and was followed by X-ray diffraction. In this context, KLa5O5(VO4)(2) can be considered as an excellent host matrix to develop new phosphors. In the present work, the luminescence properties of KLa5-xEuxO5(VO4)(2) (x = 0, 0.05, 0.1, 0.5, 1, 1.5 and 2) were investigated by fluorescence spectroscopy. The photoluminescence (PL) and PL excitation (PLE) spectra were recorded and discussed. KLa5-xEuxO5(VO4)(2) phosphors exhibit a bright reddish- orange light emission under UV excitation. The concentration quenching was determined to be at 20 mol% (x = 1) of Eu3+. The KLa4EuO5(VO4)(2) phosphor cleverly substituted is an ideal candidate for solid-state lighting and especially, as a red phosphor for near-UV LEDs or to serve as the primary light source for white LEDs.