Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 26, Pages 7885-7892Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc01356c
Keywords
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Funding
- National Key Research and Development Program of China [2017YFB0701700]
- National Natural Science Foundation of China [51602055, 11704134]
- Natural Science Foundation of Fujian Province [2019J01228]
- Qishan Scholar Scientific Research Startup Project of Fuzhou University [XRC-1626]
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Herein, the tape-casting technique was used to fabricate an Er-doped (K0.5Na0.5)NbO3 (KNN: 0.02Er) laminar ceramic, which possesses a pseudo-cubic phase structure with regular cube-shaped grains. Considering the substitution behavior of the Er dopant in the KNN lattice, X-ray diffraction analysis and density functional theory simulations both verify that Er can replace K and Na sites. And Er-induced enlargement of the energy band gap of KNN: 0.02Er has been obtained in the reflectance spectra and simulations. Furthermore, the ceramic exhibits dual-mode down-conversion and up-conversion photoluminescence (PL). As a lead-free luminescent ferroelectric, the PL intensity of KNN: 0.02Er can be enhanced by polarization induced by electric poling. And the dual-mode PL can be obviously modulated under an electric field in an in situ, reversible, real-time and dynamical way. Our results offer an effective theoretical way to bridge the relationship between the crystal structure/chemical bonding environment and the performance of the KNN system, and also provide an opportunity to realize electrically controlled tuning of the PL response in KNN-based luminescent ferroelectrics and the corresponding optoelectronic devices.
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