| 摘要 |
To provide a coated phosphor having good phosphor characteristics that can maintain light emitting characteristic for a long period of time. A mixing process is prepared in which a phosphor and aluminum alkoxide are mixed in a solvent so that the phosphor is coated with an aluminum oxide formed from the aluminum alkoxide, and the phosphor contains Group II element (M), europium (Eu), silicon (Si) and oxygen (O) in atomic weight ratios represented by the following composition formula (1): [(M)1-xEux]aSibOc Composition Formula (1) In the composition formula (1), a, b, c and x satisfy relationships: 1.8<a<3.3; 0.9<b<1.1; 3.6<c <5.5; and 0<x<0.09.
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