Eu~(3+) luminescence in Na_3SO_4F and NaMgSO_4F halosulphate phosphor for mercury-free lamps

摘要

Polycrystalline Na_3SO_4F:Eu and NaMgSO_4F:Eu phosphors prepared by a wet chemical method has been studied for its photoluminescence (PL) characteristics. PL emission spectra of Na_3SO_4F and NaMgSO_4F, phosphors under 393 nm excitation (mercury-free excitation) shows very strong prominet peak at 591 nm due to ~5D_0 ->~7F, transition and 613 nm corresponding to ~5D_0 ->~7F_2 transition in the red region of the spectrum. The PL emission spectra of Eu~(3+) ion in the, Na_3SO_4F:Eu and NaMgSO_4F:Eu phosphors are applicable for mercury free lamp industries.