| 摘要 |
PROBLEM TO BE SOLVED: To provide a 3-wavelength phosphor uniformizing the color tone of each part in the axial direction and to provide a fluorescent lamp using the phosphor in a fluorescent layer. SOLUTION: The 3-wavelength phosphor is used in a phosphor layer 2 in a fluorescent lamp comprising the phosphor layer 2 formed on the inner wall surface of a glass tube 1, a discharge medium sealed in the interior of the glass tube and electrodes 4 arranged at both ends of the glass tube. In the 3-wavelength phosphor, a red phosphor used in the phosphor layer is a single-color or a two-color mixed phosphor of YVO<SB>4</SB>:Eu or Y(P, V)O<SB>4</SB>:Eu and Y<SB>2</SB>O<SB>3</SB>:Eu. A green phosphor is a single-color or a two-color mixed phosphor of BaMgAl<SB>10</SB>O<SB>17</SB>:Eu, Mn or LaPO<SB>4</SB>:Ce, Tb. A blue phosphor is a phosphor of BaMgAl<SB>10</SB>O<SB>17</SB>:Eu. The ratio Df:Dm of the average particle diameter Df of primary particles to the average particle diameter Dm of secondary particles formed from aggregates thereof of red phosphor particles is 1:(1.0-1.4) and the ratio Df:Dm of the average particle diameter Df of primary particles to the average particle diameter Dm of secondary particles formed from aggregates thereof of green phosphor particles is 1:(1.3-2.0). The ratio Df:Dm of the average particle diameter Df of primary particles to the average particle diameter Dm of secondary particles formed from aggregates thereof of blue phosphor particles is 1:(1.0-1.7). COPYRIGHT: (C)2007,JPO&INPIT
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