Abstract
A novel near-infrared luminescent material Ca14Zn6Al10O35:Mn4+, Er3+ has been synthesized by a sol–gel method. The Ca14Zn6Al10O35:Mn4+, Er3+ phosphor exhibits strong near-infrared emission around 1540 nm with a wide excitation band extending from 250 to 550 nm. Efficient energy transfer from Mn4+ to Er3+ in Ca14Zn6Al10O35 is observed and gives about 13 times enhancement on the Er3+-1540 nm emission excited at 455 nm, which makes it convenient to obtain high-power emission by commercial GaN LED pumping. The energy transfer mechanism is discussed based on Dexter’s theory and Inokuti–Hirayama/Yokota–Tanimoto models. It is believed that a dipole–dipole interaction between Mn4+ and Er3+ ions is responsible for the large enhancement of 1540 nm emission.
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