| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluorescent lamp which is superior in a lamp light flux and color rendering properties in a region low in a correlated color temperature, and especially high in the lamp light flux and superior in the color rendering properties in a low color temperature region of F2700 in the IEC standard. SOLUTION: In the fluorescent lamp in which a phosphor layer is formed in a glass tube inner face, and in which chromaticity coordinate of a light-emitting color is in the region of F2700 in the IEC standard, This is the fluorescent lamp (1) in which the phosphor layer contains a green phosphor and a red phosphor, (2) in which the green phosphor contains the green phosphor A as its one part, (3) in which the green phosphor A is an alkaline earth metal aluminate phosphor coactivated by bivalent europium and bivalent manganese, and the ratio of intensity P1 of a first light-emitting peak in a wavelength region of 445 to 455 nm and intensity P2 of a second light-emitting peak in the wavelength region of 510 to 520 nm in a light-emitting spectrum is P2/P1≥10, and (4) in which the content of the green phosphor A is≥0.1 wt.% and≤3 wt.% of the whole phosphor amount. COPYRIGHT: (C)2009,JPO&INPIT
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