Abstract
This study has demonstrated that lithium niobate doped with praseodymium (LiNbO3:Pr), which initially did not exhibit persistent luminescence(PersL), can display significant PersL performance through the modulation of the lithium-to-niobium ratio (RLN). By adjusting the RLN to 1, LiNbO3:Pr achieved enhanced PersL, lasting several minutes, with the afterglow's duration further influenced by the RLN. Thermoluminescence (TL) assays and energy diagram analyses have elucidated that the presence and depth of oxygen vacancy defects are critical for both the emergence and longevity of PersL LiNbO3:Pr polycrystals. These insights enhance the understanding of PersL mechanisms in lithium niobate crystals and highlight their potential for application in optical information storage.
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