A warm-white emitting persistent luminescence phosphor Lu3Al2Ga3O12:Pr3+ was synthesized by solid state method at 1600 °C in air. The refined crystal structure of Lu3Al2Ga3O12 host was solved by X-ray diffraction (XRD). The photoluminescence spectra, decay curve and thermoluminescence were investigated. It was revealed that the persistent luminescence originated from the f-f transitions of Pr3+ emitters at Lu3+ sites in LuO8 polyhedrons, and it showed white color due to the3P0→3H4,3P1→3H5,3P0→3H5, 3P0→3H6,3P0→3F2,3P0→3F3 and3P0→3F4transitions of Pr3+ emitters in a wide range. The persistent luminescence of Pr3+ in this host could be promoted by f-d transition (278 nm) but f-f transitions, due to the different thermal activation energy. The persistent lumi-nescence of the optimal sample could be actually recorded for 3 h by the definition of 0.32 mcd/m2 and was visible for more than 7 h by dark-adapted vision in darkness. The initial depth of the dominant shallow traps was calculated to be about 0.56 eV, which is suit-able for persistent luminescence. The different roles of the shallow and deep traps on the persistent decay process were investigated. Accordingly, the persistent luminescence processes and mechanism of the as-synthesized Lu3Al2Ga3O12:Pr3+ phosphors were pro-posed.
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