Li-containing α- sialon-based phosphor particles, a method for manufacturing the same, lighting equipment and image display device

摘要

An Li-containing ±-sialon phosphor particle by mixing a silicon nitride or nitrogen-containing silicon compound powder, an AlN-containing aluminum source, an Li source and an Eu source, firing the mixture at 1,500 to 1,800°C in a nitrogen-containing inert gas atmosphere under atmospheric pressure to obtain a lithium-containing ±-sialon powder working out to a starting material, adding and mixing an additional lithium source to the powder, and re-firing the obtained mixture at a temperature lower than the above firing temperature or at a temperature of 1, 100°C to less than 1,600°C, at 1,100°C to less than 1,600°C, in a nitrogen-containing inert gas atmosphere under atmospheric pressure. To improve light absorptivity and fluorescence intensity of an Li (lithium)-containing ±-sialon-based phosphor capable of emitting fluorescence at a short wavelength and provide a light device and an image display device each utilizing the phosphor.