COLD CATHODE FLUORESCENT LAMP

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PROBLEM TO BE SOLVED : To provide a cold cathode fluorescent lamp that is uniform in color in a lamp axis direction by reducing values of color differences between a middle part and lamp bulb ends.SOLUTION : The cold cathode fluorescent lamp has mercury and one or more kinds of rare gases 5 sealed in a bulb 3, has a pair of discharge electrodes 1 at both ends of the bulb, and has a phosphor coating 2 including a three-wavelength phosphor composed of a red phosphor (Y2O3 : Eu), a green phosphor (LaPO4 : Ce, Tb) and a blue phosphor (BaMg2Al10O17 : Eu) formed on a bulb inner surface. The red phosphor used is a phosphor in which the magnitude ratio of a mean particle size Df value of primary particles to a mean particle size Dm value of secondary particles formed of aggregates of the primary particles is Df : Dm=1.0-1.2.COPYRIGHT : (C)2006, JPO&NCIPI