| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing strontium silicate-based fluorophor for a white LED in which the phase purity is ≥90 wt.%. <P>SOLUTION: The method for producing the fluorophor to be expressed by the composition formula 1: (Sr<SB POS="POST">1-x-y</SB>M<SB POS="POST">y</SB>Eu<SB POS="POST">x</SB>)<SB POS="POST">3</SB>SiO<SB POS="POST">5</SB>(where, 0.001≤x≤0.1, and 0≤y≤0.2, and M represents a bivalent metal.) includes at least three steps, i.e. a step 1 in which a fluorophor raw material is subjected to the wet mixing, an aggregated mixture obtained by drying and removing its solvent is cracked, and a calcination product is produced by the heat treatment in the first stage at temperatures of 1,150-1,250°C under an air atmosphere, and successively, by the heat treatment in the second stage at temperatures of 1,450-1,550°C under an air atmosphere; a step 2 of a classifying step in which the calcinated product is subjected to dry grinding, and only the particles of the particle size of 32-100 μm are taken out; and a step 3 of a heat treatment step in which the powder consisting of taken-out particles is subjected to heat treatment at temperatures of 1,450-1,550°C for 1-10 hours in an inert gas flow containing H<SB POS="POST">2</SB>by 2-12 vol.% in a weakly reducing atmosphere. <P>COPYRIGHT: (C)2013,JPO&INPIT |
