| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rare earth element aluminate fluorescent substance improved in a brightness-electric current characteristic (γcharacteristic), a temperature characteristic and a life characteristic. SOLUTION: This method for producing a rare earth element aluminate fluorescent substance comprises sintering a raw material mixture containing at least a rare earth element oxide and alumina or an aluminum compound capable of being easily converted into the alumina at a high temperature. Therein, the rare earth element oxide satisfies the following conditions, and has a spherical particle shape and a uniform particle distribution. The raw material mixture is sintered in a temperature range of 1350-1650 deg.C. D1 /Ds <=1.5; 1.0<=Da <=6.0; 1.0<=Dm <=12.0; 1.0<=Dm /Da <=2.0, and 0<=σlog <=0.30. Therein, D1 is the major axis (μm) of the particle; Ds is the minor axis (μm); Da is an average particle diameter (μm); Dm is a middle particle diameter (μm);σlog is an index representing the width of a particle size distribution.
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