Abstract
For the Er3+–Yb3+ codoped Al2O3 powders, the strong near-infrared photoluminescence (PL) centered at 1.535 μm derived from the energy transfer (ET) from Yb3+ to Er3+ was detected by a 978 nm laser diode excitation. Compared with that of Er3+ doped Al2O3 powders, the PL intensity enhanced about 9 times, the full width at half maximum (FWHM) extended from 82 to 90 nm, and the lifetime increased from 3.22 to 4.17 ms for Er3+–Yb3+ codoped Al2O3 powders at room temperature. The ET coefficient of 2.18 × 10−18 cm3 s−1 from Yb3+ to Er3+ was obtained based on the rate equations. The decrease of PL intensity with increasing temperature in the range of 298–733 K was observed, due to thermally enhanced nonradiative relaxation 4I13/2 → 4I15/2 dominated over thermally enhanced phonon-assisted ET in the Er3+–Yb3+ codoped Al2O3.
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