| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem of a white LED that it is insufficient in a red component of its color resulting in pale light which gives a cool and inorganic impression to matter irradiated therewith and therefore, though it has got a wide range of use, it cannot be used for illumination in an environment such as a store or a living room where a high color-rendering property is required or in an environment where warm tints are required. <P>SOLUTION: Ta<SB>2</SB>O<SB>5</SB>and Eu<SB>2</SB>O<SB>3</SB>are mixed so that the ratio of the number of the atoms, Ta:Eu, is 0.96:0.04 to 0.70:0.30 and the mixture is heated at a temperature of 1,200°C or higher and not higher than the melting point of the Ta oxide. Thus, a red phosphor comprised of Ta<SB>2</SB>O<SB>5</SB>as a host oxide and Eu as a light-emitting source is easily obtained. Further incorporation of Zn or Ti with the mixture enhances light-emitting properties. The base oxide may be Ta<SB>2</SB>O<SB>5</SB>+Al<SB>2</SB>O<SB>3</SB>instead of Ta<SB>2</SB>O<SB>5</SB>. <P>COPYRIGHT: (C)2008,JPO&INPIT |
