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Up-conversion in Er3+/Yb3+ co-doped LaPO4 submicron-sized spheres

AuthorsGarcía-Sevillano, J.; Cantelar, Eugenio; Cussó, Fernando; Ocaña, Manuel
Thermal treatment;
Quantum yield
Issue Date2015
CitationOptical Materials, 41:104-107 (2015)
AbstractEr3+/Yb3+ co-doped materials have been extensively used for imaging in biomedical applications using either visible up-converted (UC) or near-infrared (NIR) emissions. The UC spectrum is composed mainly by two Erbium emissions in the green (2H11/2:4S3/2 → 4I15/2) and red (4F9/2 → 4I15/2) spectral range, while the NIR spectrum includes Er3+ (λ ∼ 1.5 μm, 4I13/2 → 4I15/2) and Er3+/Yb3+ (λ ∼ 980 nm, 2F5/2 → 2F7/2 (Yb3+):4I11/2 → 4I15/2 (Er3+)) transitions; which relative intensities are dependent on several physical parameters. In the present work, we present the preparation and optical characterization of Er3+/Yb3+ co-doped LaPO4 submicron-sized spheres. The luminescence (CW and pulsed) characteristics, after different post-annealing treatments, are studied. It is found that such treatments strongly increment the emission efficiency, possibly due to the suppression of residual impurities. After calcination at 1100 °C the material behaves as an excellent UC and NIR–NIR wavelength converter
Publisher version (URL)http://dx.doi.org/10.1016/j.optmat.2014.10.022
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