5d–4f transition in new phosphate‐based phosphors

The preparation of Ce³⁺‐doped Sr₆AlP₅O₂₀ and Ba₆AlP₅O₂₀ by a combustion method is described. Formation of compounds was confirmed by X‐ray diffraction (XRD) analysis. The photoluminescence (PL) emission spectra were observed at 355 nm when excited at 307 nm for the various concentrations. The PL emission spectra of phosphors showed strong Ce³⁺ emission due to the 5 d → 4f transition of Ce³⁺ ions. The Ce³⁺ emission intensity in Sr₆AlP₅O₂₀:Ce phosphor was higher than that in Ba₆AlP₅O₂₀:Ce and it may be useful for scintillation applications. Copyright © 2011 John Wiley & Sons, Ltd.