Abstract
Red-emitting phosphor Na2SiF6:Mn4+ was synthesized by a simple exchange process in H3PO4. Its crystal structure and morphology were characterized. Na2SiF6:Mn4+ with single phase exhibits intense emission with the strongest peak at ∼ 627 nm. The emission energy from Na2SiF6:Mn4+ is observed to be obviously higher than those from A2SiF6:Mn4+ (A = K, Rb and Cs). This sample also has an excellent thermal quenching behavior. The present red-emitting phosphor was used for the fabrication of white light-emitting diodes and found to show good optical properties with color temperature of 3821 K and color rendering index of 94.4).
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