Abstract
The near-infrared (NIR) persistent luminescence and thermoluminescence of Mn4+ activated LaAlO3 (LAO) and LAO:Mn4+,R (R= Na+, Ca2+, Sr2+, Ba2+) ceramics were investigated. After irradiation with 335 nm excitation light, deep red and NIR persistent luminescence was obtained in the wavelength region from 650 nm to 750 nm due to the Mn4+ dopants, well within the biological tissue transparency window for in vivo imaging. The afterglow can be attributed to the presence of Mn4+ induced traps in the LAO host. By carrying out a series of thermoluminescence measurements, the formation of a broad range of traps was identified, with two main peaks centered at 0 °C and 114 °C. Na+, Ca2+, Sr2+ or Ba2+ ions were added as co-dopants to optimize the location and energy of the trap levels, improving the NIR persistent luminescence.
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