Abstract

Here we report the observation of near-infrared persistent luminescence (NIR PersL) of ${\mathrm{Yb}}^{3+}$ in perovskite ${\mathrm{CaTiO}}_3$. Sensitized by the ${\mathrm{Bi}}^{3+}$ codopants, it exhibits intense NIR PersL of ${\mathrm{Yb}}^{3+}$ at about 1000 nm. In addition, this phosphor can be excited by the near ultraviolet and even visible light, and the PersL signals can be recorded for more than 80 h. The PersL enhancement by ${\mathrm{Bi}}^{3+}$ is revealed to be due to the suitable ${\mathrm{Bi}}^{3+}$ induced deeper traps and the possible PersL quantum cutting. The results suggest that the NIR PersL of the ${\mathrm{CaTiO}}_3\text{:}{\mathrm{Yb}}^{3+}$, ${\mathrm{Bi}}^{3+}$ phosphor has potential applications for biomedical imaging in the second biological window.

© 2017 Optical Society of America

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