| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a novel fluorescent substance capable of absorbing near ultraviolet light and emitting various colors ranging from blue to green, neutral colors, and the like and to provide a light emitting device by which white light can be obtained with the emission of the fluorescent substance alone through combination of the novel fluorescent substance and a near ultraviolet light source. <P>SOLUTION: Raw material compounds, MgO, Al<SB>2</SB>O<SB>3</SB>, SiO<SB>2</SB>, Si<SB>3</SB>N<SB>4</SB>, Eu<SB>2</SB>O<SB>3</SB>, and MnO, are mixed so that the mixture ratio (molar ratio), MgO:Al<SB>2</SB>O<SB>3</SB>:SiO<SB>2</SB>:Si<SB>3</SB>N<SB>4</SB>:Eu<SB>2</SB>O<SB>3</SB>:MnO represented by (1-y/2-z):a:b:c:y:z, satisfies 0.04≤y≤0.2, 0≤z≤0.1, 0.5≤a≤1, b=1, and 0.33≤c≤1. The mixture of the raw material compounds was baked in a nitrogen-pressurized atmosphere of 1.0 MPa or less. The material was crushed after baking and then further annealed in a nitrogen atmosphere under normal pressure. Thus a novel fluorescent substance containing MgAl<SB>2</SB>Si<SB>4</SB>O<SB>6</SB>N<SB>4</SB>as the main phase and Eu as an activator (Re) can be obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT |
