Near-infrared persistent luminescence of Yb 3+ in perovskite phosphor

Here we report the observation of near-infrared persistent luminescence (NIR PersL) of Yb in perovskite CaTiO . Sensitized by the Bi codopants, it exhibits intense NIR PersL of Yb 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 Bi is revealed to be due to the suitable Bi induced deeper traps and the possible PersL quantum cutting. The results suggest that the NIR PersL of the CaTiO :Yb , Bi phosphor has potential applications for biomedical imaging in the second biological window.