An yellow-emitting phosphor for white LED application, (Sr,Ba)Si2O2N2:Eu2+, has tabular particle shapes with very broad size distribution, when prepared by a reported method utilizing NH4Cl as a flux. To improve this disadvantage, effects of other fluxes were investigated. Addition of 2 wt.% or less alkali or ammonium nitrate provides more bulky particles of narrower size distribution with little sacrifice of efficiency. Meanwhile, nitrates at high amount of addition and borates as well produce a secondary phase, (Sr,Ba)3Si6O9N4:Eu2+, having poor efficiency, though bulky shapes are obtained. This is probably because some of corner-shared [SiN4]8- tetrahedra are replaced by tetrahedra bridged by O atoms.
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