Abstract
In this paper we investigate the upconversion luminescence of bulk and nanocrystalline Lu 1 . 9 8 Er 0 . 0 2 O 3 following excitation into the 4 I 1 1 / 2 level using 980 nm radiation. After NIR continuous wave excitation, blue, green, and red emissions were observed for both samples under investigation with the green emission dominating the upconversion spectrum. A power study reveals that the 4 S 3 / 2 (green) and 4 F 9 / 2 (red) emitting levels are populated via two-photon excited-state absorption (ESA) and energy-transfer upconversion (ETU) processes. Upconversion from the 2 P 3 / 2 level is attained via a three-step phonon-assisted energy-transfer process. A marked temperature dependence of the excited-state lifetimes in both the bulk and nanocrystalline samples was evidenced.
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