Abstract
White‐light emission was achieved by activating yttrium oxyorthosilicate with two rare‐earth elements, (Y1−m−nCemTbn)2SiO5. Ce3+ strongly absorbs at λex=358 nm and produces a broad, mainly blue emission with a tail that extends out to 600 nm (orange), and transfers energy efficiently to Tb3+, which produces strong green‐line emissions at 550 nm and some red emission around 650 nm. At λex=358 nm, chromaticity coordinates of the optimally activated (Y0.9625Ce0.0075Tb0.03)2SiO5 were found to be x=0.266, y=0.365 with a color temperature 8512 K. Upon mixing in another red‐emitting phosphor, (Y0.955Bi0.005Eu0.04)2O3, the chromaticity and color rendering index values were improved.
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