β-sialon (Si 6−z Al z O z N 8−z ):Eu 2+ phosphors with the oxygen concentrations as low as less than 1 wt% were synthesized by using the pure Si metal as the Si source. The oxygen concentrations could be controlled in the range of 0.3–0.7 wt%, which corresponds to the z value of 0.06–0.13 by using the mixtures of the Si metal and α-Si 3 N 4 powder. The photoluminescence of the samples showed the blue shifted emission spectrum and the narrower line width when the oxygen concentration was decreased. A wider color gamut can be achieved by using the β-sialon with the low oxygen concentration.
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Takahashi et al. (2011) studied this question.
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