Abstract
In order to enhance luminescence properties of Eu 2+-doped ternary nitride phosphor for white light-emitting diodes (LEDs), Sr 2Si 5N 8:Eu 2+ phosphors with different Eu 2+ concentrations were synthesized using a multi-step heat treatment. Impurities and luminescence properties of prepared Sr 2Si 5N 8:Eu 2+ phosphors were investigated using X-ray diffraction (XRD) and photoluminescence spectroscopy. Excitation spectra of Sr 2Si 5N 8:Eu 2+ phosphor showed broad excitation bands by both UV and blue light. Emission peak positions in spectra were red-shifted from 613 to 671 nm as Eu 2+ ion concentrations increased. Phosphors following a multi-step heat treatment showed excellent luminescence properties. These included high emission intensity and very low thermal quenching compared to measurements using a commercially available YAG:Ce 3+ phosphor.
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