| 摘要 |
A fluorescent substance consisting of Eu-activated beta type sialon and capable of enhancing the brightness of a light emitting device such as a white LED using blue or ultraviolet light as a light source. The fluorescent substance represented by a general formula: Si6-zAlzOzN8-z and mainly containing beta type sialon including Eu, characterized in that its spin density corresponding to absorption of g=2.00 Œ 0.02 at 25‹C when measured by electron spin resonance spectrum is up to 2.0 x 1017 pieces/g. In the above fluorescent substance, it is preferable that lattice constant a of beta type sialon range 0.7608-0.7620 nm, lattice constant c range 0.2908-0.2920 nm, and Eu content be 0.1-3 mass%. ® KIPO & WIPO 2009
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