Single-phased chromaticity-tunable phosphor of Sr₄Al₁₄O₂₅: Eu2+/3+ co-doped with Tb³⁺ for white-light-emitting diodes

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The single-phased phosphors doped with Eu 2+ and Eu 3+ have shown the potential for the application of white-light-emitting diodes (wLEDs). In this manuscript, we introduced a simple method of co-doping terbium ions into the Sr 4 Al 14 O 25 : Eu 2+/3+ phosphor to achieve the tunable chromaticity and the good color rendering performance. The phosphor was synthesized through the conventional solid-state reaction in a non-reducing atmosphere. The phase purity was examined by XRD analysis, and the luminescent properties were discussed systematically depending on the room- and low-temperature photoluminescence spectra. The emission spectrum of the sample Sr 4 Al 14 O 25 : 0.01Eu 2+/3+ , 0.06Tb 3+ covered the whole visible spectral region with a white light emission (0.2799, 0.3059), indicating that the present phosphor could be suitable for the wLEDs application.