Up conversion luminescence of Yb3+-Er3+ codoped CeO2 nanocrystals with imaging applications

    Authors

    J. H. Cho; M. Bass; S. Babu; J. M. Dowding; W. T. Self;S. Seal

    Comments

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    Abbreviated Journal Title

    J. Lumines.

    Keywords

    Up conversion; Nano particles; Energy transfer effects; Imaging; TO-VISIBLE CONVERSION; UP-CONVERSION; YB3+ CONCENTRATION; GLASS; Optics

    Abstract

    The effects of Yb3+ doping on up conversion in Yb3+-Er3+ co-doped cerium oxide nanocrystals are reported. Green emission around 545 and 560 nm attributed to the H-2(11/2), S-4(3/2)- > I-4(15/2) transitions and red emission around 660 and 680 nm due to F-4(9/2) - > I-4(15/2) transitions under 975 nm excitation were studied at room temperature. Both green and red emission intensities increase as the Yb3+ concentration increases from 0%. Emission strength starts to decrease after the Yb3+ concentration exceeds a critical amount. The green emission strength peaks around 1% Yb3+ concentration while the red emission strength peaks around 4%. An explanation of competition between different decay mechanisms is presented to account for the luminescence dependence on Vb(3+) concentration. Also, the application of up converting nanoparticles in biomedical imaging is demonstrated. (C) 2011 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Luminescence

    Volume

    132

    Issue/Number

    3

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    743

    Last Page

    749

    WOS Identifier

    WOS:000303286100034

    ISSN

    0022-2313

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