Optical EngineeringNovel full color greenish-white-emitting Sr3Bi(PO4)3∶Eu2+ phosphor for white light-emitting diodes
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The full color greenish-white-emitting phosphors Eu2+-doped Sr3 Bi(PO4)3 have been successfully synthesized by the conventional solid-state reaction, and its photoluminescence properties have been investigated for the first time. The emission spectra of Sr3Bi(PO4)3∶Eu2+ phosphors exhibit a greenish-white-emitting by combining blue, green, and red emissions, which are originated from the 5d→4f transition of the Eu2+. The excitation spectra reveal broad strong bands from 300 to 400 nm, which match well with the readily available emissions from near-ultraviolet light-emitting diode (LED) chips. The correlated color temperature, color rendering index (CRI), and Commission Internationale de I’Eclairage chromaticity coordinates of the entitled phosphors excited by 330 and 365 nm are also investigated. The experimental results indicate that the Eu2+-doped Sr3 Bi(PO4)3 phosphors are a promising innovative greenish-white-emitting phosphor for white LEDs.