Abstract
To reveal the components of defects responsible for persistent luminescence properties of CaAl2O4:Eu2+, Nd3+, a slight amount of Sr2+ ions were doped in host lattice. Their thermoluminescence (TL) and decay curves were investigated. The results showed that the concentration of traps in CaAl2O4:Eu2+, Nd3+ decreased linearly with the increase in Sr2+. Furthermore, both of their initial luminance and decay time also decreased. As Sr2+ ions preferred to occupy Ca2+ vacancies, the suppression of TL and persistent luminescence reflected that some isolated Ca2+ vacancies might be acting as bridges to transport carriers between trapping centers and emission centers. On the basis of these results, the manner of carriers’ transport in CaAl2O4:Eu2+, Nd3+ is discussed in detail, and a possible structural defects unit is designed as well.
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