| 摘要 |
PROBLEM TO BE SOLVED: To provide an orange fluorescent substance emitting a light to high luminance with higher efficiency from a near-ultraviolet light to a visible light, i.e., in a range of wavelength of 300-500 nm required when further practical use of LED illumination from now is achieved, and to provide a method for manufacturing the same. SOLUTION: The orange fluorescent substance has a crystal structure of the same monoclinic system as Eu<SB>2</SB>SiS<SB>4</SB>, is represented by the composition formula: (Ca<SB>1-y-z</SB>Sr<SB>y</SB>Ba<SB>z</SB>)<SB>2-x</SB>Eu<SB>x</SB>SiS<SB>4</SB>, has Eu concentration x in a range of 0<x≤0.2, Sr concentration y in a range of 0≤y≤0.3 and Ba concentration z in a range of 0<z≤0.6, and is excited by a light from a near-ultraviolet ray to a visible area. COPYRIGHT: (C)2011,JPO&INPIT |
