By studying energy transfer and persistent energy transfer properties in Eu, Mn co-doped calcium aluminate CaAl2O4, it was found that traditional persistent luminescence mechanisms had difficulty in explaining persistent energy transfer property be-tween Eu2+ and Mn2+ ions. Based on this question, a mechanism was suggested in which vibrational energy levels were considered as a Morse potential, and trap centers were distinguished into barriers and wells. Then, this phenomenon was explained by allowing en-ergy transfer and persistent energy transfer could have different preference to different vibrational energy levels. Properties of trap centers were also discussed by using the concept of Madelung energy.
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