Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15271
Title: Enhanced visible and mid-IR emissions in Er/Yb-codoped K0.5Na0.5NbO3 ferroelectric ceramics
Authors: Wu, X
Chung, TH
Kwok, KW 
Keywords: Er-doped KNN ceramics
Ferroelectrics
Mid-IR emission
Up-conversion photoluminescence
Issue Date: 2015
Publisher: Elsevier Ltd
Source: Ceramics international, 2015 How to cite?
Journal: Ceramics International 
Abstract: Er3+/Yb3+-codoped K0.5Na0.5NbO3 (KNN) ceramics have been fabricated by the solid state reaction method. Under the excitation of 980nm, Er3+ ions exhibit visible up-conversion emissions as well as the near-infrared (NIR) and middle-infrared (MIR) emissions. Yb3+ ions are used as the sensitizer to codope with Er3+ in the KNN host in the purpose of improving the emission efficiency and PL intensities, i.e. significantly enhancing the blue, green, red and MIR emissions of Er3+. The concentration quenching effect has been discussed together with the up-conversion emissions and corresponding luminescent lifetimes. The energy transfer processes between Er3+ and Yb3+ have been investigated with the relationship between the Yb3+ concentration and PL intensities. Due to the moderate ferroelectric and piezoelectric properties of the host, the ceramics show multifunctional performance and potential in the application of optoelectronic areas.
URI: http://hdl.handle.net/10397/15271
ISSN: 0272-8842
DOI: 10.1016/j.ceramint.2015.07.018
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