Process for production of fluorescent substance
The embodiment provides a process for production of an oxynitride fluorescent substance. In the process, a compound represented by the formula: (Sr,Eu) 2 Si 5 N 8 , silicon nitride and aluminum nitride are mixed and then fired in a nitrogen atmosphere under high pressure.
1. A process for production of an oxynitride fluorescent substance, comprising a step in which a mixture containing first-phase crystals having the same crystal structure as Sr 2 Al 2 Si 10 O 4 N 14 and second-phase crystals having the same crystal structure as Sr 2 Al 3 Si 7 ON 13 is fired in a nitrogen atmosphere under high pressure.
2. The process according to claim 1 , wherein the firing temperature is 1700° C. or more.
3. The process according to claim 1 , comprising pre-firing components of the mixture in an atmosphere containing hydrogen and nitrogen before firing.
4. The process according to claim 3 , wherein the pre-firing temperature is in the range of 1400 to 1650° C.