| 摘要 |
Provided is a perovskite-type fluorescent oxide which has excellent chemical stability and the property of emitting white fluorescence and which is useful in thin-film electroluminescent devices for illuminators/light sources, displays, and the like. Also provided is a thin film of a fluorescent oxide. By adding Bi element to CaTiO3, which is a perovskite-type inorganic oxide, in an amount of 0.1-0.4 at.%, the property of emitting white fluorescence in which the fluorescent intensity is high throughout the whole wavelength range of 450-700 nm is imparted. This fluorescent material in any of particulate, bulk, and thin-film forms shows the white fluorescence properties. The fluorescent intensity can be further improved by burning, at 900-1,100ºC, the CaTiO3 to which Bi element has been added in the given amount. The thin film is obtained preferably by using a target comprising CaTiO3 containing Bi element to form a thin film by a pulsed laser deposition method at a given temperature in an atmosphere having a given oxygen pressure and by heat-treating the thin film in the air at a temperature of 900-1,100ºC.
|
