Single-phased,high-color-rendering index (CRI) white-light phosphors are emerging as potential phosphor-converted white-light-emitting diodes (WLEDs) and as an alteative to blends of tricolor phosphors.However,it is a challenge to create a high CRI white light from a single-doped activator.Here,we present a high CRI (Ra =91) white-light phosphor,Sr5(PO4)3-x(BO3)xCl:Eu2+,composed of Sr5(PO4)3Cl as the beginning member and Sr5(BO3)3Cl as the end member.This work utilized the solid-solution method,and tunable EU2+ emission was achieved.Color-tunable Eu2+ emissions in response to structural variation were observed in Sr5(PO4)3-x(BO3)xCl solid solutions.This was further confirmed using X-ray Rietveld refinement,electron paramagnetic resonance spectroscopy,and in the photoluminescence spectra.The color-tunable emissions included the white light that originated from the combination of the blue emission of Sr5(PO4)3Cl:Eu2+ and an induced Eu2+ yellow emission at approximately 550 nm in the solid solution.Importantly,the white-light phosphors showed a greater R9 =90.2 under excitation at 365 nm.This result has rarely been reported in the literature and is greater than that of (R9 =14.3) commercial Y3A15O12:Ce3+-based WLEDs.These findings demonstrate the great potential of Sr5(PO4)3-x(BO3)xCl:O.O4Eu2+ as a white-light phosphor for near-UV phosphor-converted WLEDs.These results also provide a shortcut for developing a high CRI white-light phosphor from a single Eu2+-doped compound.