Abstract
A series of Eu2+ -activated barium orthosilicates (BaZnSiO4 ) were synthesized using a high-temperature solid-state reaction. A photoluminescence excitation study of Eu2+ shows a broad absorption band in the range of 270-450nm, with multiple absorption peak maxima (310, 350 and 400nm) due to 4f-5d electronic transition. The emission spectra of all the compositions show green color emission (in the spectral region 450-550nm with a peak maximum at 502nm and a shoulder at ~490nm) with appropriate Comission Internationale de l'Eclairage (CIE) color coordinates. The two emission peaks are due to the presence of Eu2+ in two different Ba sites in the BaZnSiO4 host lattice. The energy transfers between the Eu2+ ions in BaZnSiO4 host are elucidated from the critical concentration quenching data based on the electronic multipolar interaction. All Eu2+ -activated BaZnSiO4 phosphor materials can be efficiently excited in the ultraviolet (UV) to near UV-region (270-420nm), making them attractive candidate as a green phosphor for solid state lighting-white light-emitting diodes.
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