| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure which can efficiently emit ultraviolet rays with a wavelength of 200-260 nm and hardly peel off a phosphor layer on an inner surface of a light-emitting tube, in a fluorescent lamp having the light-emitting tube made of quartz glass, and the phosphor layer applied to the inner surface of the light-emitting tube and emitting ultraviolet rays. SOLUTION: In the fluorescent lamp, the phosphor layer has (La, Pr) PO phosphor wherein general formula of the phosphor is expressed by (La<SB>1-X</SB>, Pr<SB>X</SB>) PO<SB>4</SB>. Here, x is at a range of 0.02-0.04. Furthermore, a glass layer made from soft glass or hard glass is formed between the light-emitting tube and the phosphor layer. COPYRIGHT: (C)2011,JPO&INPIT |
