A novel red-emitting Na 2 Y 2 Ti 3 O 10:Eu 3+,Sm 3+ phosphor was synthesized for the first time, and its photoluminescence (PL) properties were investigated for application to white-light-emitting diodes (W-LEDs). The Na 2 Y 1 Eu 1 Ti 3 O 10 phosphor showed a 3-fold higher PL intensity compared to that of a commercial red-emitting Y 2 O 2 S:Eu 3+ phosphor under 396 nm irradiation. Sm 3+ ions were introduced as a sensitizer, and they increased the PL intensity by up to 35% under 410 nm irradiation. The effects of introducing the sensitizer were investigated by measuring the quantum efficiencies and the time-resolved PL decay curves. The Na 2 Y 1 Eu 1 Ti 3 O 10 phosphor exhibited remarkable resistance to thermal quenching, and a W-LED comprising the phosphor showed bright white emission with a color rendering index ( R a ) of 83, a color temperature of 5556 K, and Commission Internationale de I’Eclairage (CIE) color coordinates of (0.3306, 0.3754).
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Kang et al. (2011) studied this question.
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