Abstract
New red-emitting Eu2+-doped SrLu2O4 phosphors were synthesized by a solid state reaction, and the effects of starting material composition, annealing temperature, and Eu2+ doping concentration on the phase formation and photoluminescence (PL) properties were investigated. A single phase SrLu2O4:Eu2+ phosphor was obtained between 1400 and 1500°C in Sr-rich condition under 5% H2/N2 atmosphere. As-synthesized SrLu2O4:Eu2+ phosphors exhibited a strong red emission centered at 610nm under the excitation of λex=450nm. The highest emission intensity was observed in 0.004mol Eu-substituted composition, which was ~85% compared to that of commercial (Sr,Ca)AlSiN3:Eu2+ phosphor. SrLu2O4:Eu2+ phosphors showed a strong thermal quenching, which suggests a high potential as an optical temperature sensor.
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