UV Photoluminescence of Eu3+doped Na3SO4F Red Halosulphate Phosphor for White Light Emitting Diodes

Abstract

The high luminescent Na₃SO₄F: Eu³⁺ halosulphate phosphor with improved the color purity and high intensity of red phosphor for solid state lighting devices was reported. The halosulphate phosphor was developed by re-crystallization technique. Crystal structure and phase formation of the product was identified by powder XRD technique and particle morphology was studied by FE-SEM. The photoluminescence (PL) spectra were investigated under 393nm (UV) excitation. The prepared halosulphate Na₃SO₄F: Eu³⁺ phosphor showed a strong red emission around 617 nm. This is due to Eu³⁺ substituted for Na³⁺ occupied the non centro-symmetric position. The Eu³⁺ doped ion will increase the electric dipole 5F₀®7D₂ transition of Eu³⁺ in the crystal structure of Na₃SO₄F: Eu³⁺. It can be concluded that re-crystallization technique can successfully employed to promising red phosphor for solid state lighting devices.