X-ray Rietveld refinement of structure of Ba-deficient Ba3Si6O12N2:Eu phosphor

Abstract

Green oxynitride phosphors Ba 3 Si 6 O 12 N 2 were prepared with metallic ratio of Si / Ba = 3. It was found that the nonstoichiometric mixture at Si / Ba = 3 formed the Ba 3 Si 6 O 12 N 2-type phase easier than the stoichiometric one at Si / Ba = 2 after it was fired at 1200°C for 5 h under a diluted hydrogen flow (5% H 2–95% N 2). The excess Si source led to a formation of SiO 2 glass, which can act as a flux in case of formation of Ba 3 Si 6 O 12 N 2.