| 摘要 |
This invention provides a beta-type sialon fluorescent substance that can realize enhanced brightness of a white luminescent diode using blue to ultraviolet light as a light source. The beta-type sialon fluorescent substance comprises beta-type sialon represented by general formula: Si 6-zAlzOzN8-z as a matrix material. In the beta-type sialon fluorescent substance, Eu is present in a solid solution form as a luminescence center. Z in the composition represented by the general formula is not less than 0.24 and not more than 0.42, the content of Eu is 0.05 at% to 0.25 at%, and the content of the beta-type sialon, which dissolves Eu in a solid solution, is not less than 90% by mass. The beta-type sialon fluorescent substance is preferably a powder having an average particle diameter of not less than 1 mum and not more than 20 mum. A white LED having good luminescent characteristics can be realized by using a blue or ultraviolet light emitting diode as an excitation light source which is used in combination with a fluorescent substance that emits yellow or red light.
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