A 505 nm-peaked photoluminescence of phosphor for white-light-emitting diodes originating from an intermediate phase, , is found. The corresponding optical properties of this 505 nm-peaked photoluminescence resemble those of well. X-ray diffraction (XRD) results confirm the existence of in the . The formation of is ascribed to the phase equilibrium during firing. Addition of flux inhibits the formation of intermediate phases and improves the crystallinity of . Specifically, as a proper amount of is added, the 505 nm-peaked photoluminescence disappears and the XRD peaks attributed to disappear as well.
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Ma et al. (2007) studied this question.
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