Wet chemical synthesis and photoluminescence study of Eu3+ activated orthophosphate-based phosphor for n-UV-based solid-state lighting.

The wet chemical synthesis was used to make a series of Sr₃La(PO₄)₃:Eu³⁺ phosphors. X-ray diffraction (XRD), morphology, photoluminescence characteristics and chromaticity were thoroughly investigated. The X-ray diffraction was used to confirm the cubic phase with the space group I − 4 3 d (220). The Sr₃La(PO₄)₃:Eu³⁺ phosphors show a strong excitation peak at 394 nm. Upon 394 nm excitation, two emission peaks were observed at 594 nm (orange) and 615 nm (red), which corresponding to the transitions ⁵D₀ → ⁷F₁ and ⁵D₀ → ⁷F₂ of Eu³⁺ ions, respectively. The concentration quenching occurred at 0.5 mol % of Eu³⁺ ions. The chromaticity coordinates of wavelength 594 nm are (x = 0.597, y = 0.401), and wavelength 615 nm is (x = 0.680, y = 0.319). The Sr₃La(PO₄)₃:Eu³⁺ phosphors are a series of candidate phosphors for near-UV-based solid-state lighting. [ABSTRACT FROM AUTHOR]