Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 201, Issue -, Pages 23-28Publisher
ELSEVIER
DOI: 10.1016/j.mseb.2015.06.011
Keywords
Ferroelectric; Multifunctional diphase ceramics; Dual-mode photoluminescence; Optical temperature sensing
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Dual-mode phosphors, Er3+ doped Ba0.4Ca0.6TiO3 ferroelectric diphase ceramics, were prepared by a conventional solid-state reaction method and their phases, microstructure, photoluminescence, ferroelectric and dielectric properties were investigated. The ceramics exhibit up-conversion and down-conversion emission of 550 nm light excited by a near-infrared (980 nm) light and a 487 nm blue light, respectively. The related photoluminescence mechanism has been discussed. In up-conversion emission, the H-2(11/2) -> I-4(15/2) and S-4(3/2) -> I-4(15/2) transitions of the Er3+ ion portray a temperature dependent behavior and have been used for optical temperature sensor using the fluorescence intensity ratio method. The maximum sensitivity is found to be 0.0033 K-1 at 483 K in the temperature range of 103-573 K. Together with the enhanced ferroelectric properties and good dielectric properties, these ceramics should be one of the promising candidates for multifunctional optoelectronic applications. (C) 2015 Elsevier B.V. All rights reserved.
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