Publication Date:
2012-10-17
Description:
Er 3+ -doped Ca Bi 4 Ti 4 O 15 (CBT) bismuth layer structured ferroelectric ceramics were synthesized by the solid state method. Photoluminescence (UC), dielectric, ferroelectric, and piezoelectric properties were systematically studied for the first time. The Er 3+ -doped CBT sample showed a bright up-conversion UC while simultaneously obtaining an increased Curie temperature ( T c ), enhanced ferroelectric and piezoelectric properties. The UC properties of Er 3+ -doped CBT were investigated as a function of Er 3+ concentration and incident pump power. A bright green (556 nm) and a weak red (674 nm) emission bands were obtained under excitation (980 nm) at room temperature, which correspond to the transitions from 4 S 3/2, and 4 F 9/2 to 4 I 15/2 , respectively. The dependence of UC emission intensity on pumping power indicated that three-photon and two-photon processes are involved in the green and red UC emission, respectively. Studies on dielectric properties indicated that the introduction of Er increased the T c with relatively smaller values of dielectric loss of CBT, thus making this ceramic suitable for sensor applications at higher temperatures. Ferroelectric and piezoelectric measurements showed that the Er 3+ -doped ceramics showed an increase in remnant polarization and piezoelectric constant. As a multifunctional material, Er -doped CBT ferroelectric oxide showed great potential in sensor, optical-electro integration, and coupling device applications.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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