| 摘要 |
PROBLEM TO BE SOLVED: To provide a new light-emitting composite material exhibiting luminescence when external force is applied and having excellent visibility also when external force is not applied. SOLUTION: The light-emitting composite material is prepared by combining a stress-induced light-emitting material and a light storage material with other material such as a resin. The stress-induced light-emitting material, e.g. SrAl<SB>2</SB>O<SB>4</SB>:Eu, La is obtained by adding a rare earth element to an oxide of an alkaline earth metal and aluminum as a matrix. The light storage material is e.g. CaAl<SB>2</SB>O<SB>4</SB>: Eu, Nd. The resin is preferably an epoxy resin or a silicone resin. COPYRIGHT: (C)2005,JPO&NCIPI
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