Abstract
AbstractTm3+‐doped Y2O3 nanocrystals were prepared via hydrothermal conditions at high autogenous pressure (ca. 40 MPa) using batch reactors at 220 and 250 °C for very short periods of reaction time (10 min). The as‐prepared materials were identified as Y(OH)3 nanoparticles. The precursor materials with two types of morphologies, such as sphere and rod‐shaped particles were prepared at 220 and 250 °C within 10 min. The sizes of the as‐prepared sphere particles are 10–15 nm in diameter, whereas the rod‐shaped particles show 15–20 nm in diameter and 0.1–0.2 μm in lengths. The precursor materials were calcined at 500 and 800 °C for 5 h in air to obtain (3 mol‐%) Tm3+‐doped Y2O3 nanocrystals. For the characterization, XRD, FESEM, EDS and TG‐DTA were employed. The photoluminescence spectra of sphere and rod‐shaped particles show higher blue emission at 450 nm than the reference sample. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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