Abstract
A series of blue-emitting phosphors Sr5(PO4)3F: Eu2+ were synthesized by traditional high temperature solid-state reaction method. The micro-morphology and photoluminescence properties of the phosphors were investigated. The Sr5(PO4)3F: Eu2+ phosphors exhibit broad excitation spectra ranging from 250 to 420nm, and an intense asymmetric blue emission band peaking at 435nm. Two different Eu2+ emission centers in Sr5(PO4)3F: Eu2+ phosphors were confirmed via their fluorescence properties. The concentration quenching mechanism, fluorescence lifetime and thermal stability of Sr5(PO4)3F: Eu2+ phosphors were studied in detail. The thermal stability can be improved obviously by anion substitution. The CIE chromaticity coordinates of Sr5(PO4)3F: Eu2+ phosphors with different Eu2+-doped concentrations were calculated. A blue light-emitting diode was fabricated by combination of a 370nm InGaN chip and the prepared phosphor Sr5(PO4)3F: Eu2+. The present work suggests that Sr5(PO4)3F: Eu2+ is a potential phosphor applied in InGaN-based LEDs.
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