Patent ID: 8038905

Claim:
A method of forming a phosphor comprising a rare earth metal-activated oxonitridoalumosilicate of general formula (Ca 1−x−y−z Sr x Ba y Mg z ) 1−n (Al 1−a+b B a )Si 1−b N 3−b O b :RE n , wherein 0≦x≦1, 0≦y≦1, 0≦z≦1, 0≦a≦1, 0<b≦1 and 0.002≦n≦0.2 and RE is selected from europium(II) and cerium(III), the method comprising: milling precursor material with a flux; and firing the precursor material and the flux at a first temperature; wherein: the first temperature is greater than room temperature; and the flux forms a liquid phase at the first temperature.