Fluorescent lamp

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PROBLEM TO BE SOLVED : To provide a fluorescent lamp comprising an arc tube that is formed from quartz glass, is filled with discharge gas containing inert gas, and emits excimer light and a phosphor layer that is formed on the surface of the arc tube and radiates ultraviolet light, the fluorescent lamp being designed to efficiently radiate ultraviolet light of 240-nm to 280-nm wavelength.SOLUTION : A phosphor layer comprises phosphor the general formula of which is expressed by Ca9(REX, Pr1-X)(PO4)7(RE=Y, La).SELECTED DRAWING : Figure 1COPYRIGHT : (C)2017, JPO&INPIT