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Issue 26, 2019
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In situ boost and reversible modulation of dual-mode photoluminescence under an electric field in a tape-casting-based Er-doped K0.5Na0.5NbO3 laminar ceramic

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Abstract

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.

Graphical abstract: In situ boost and reversible modulation of dual-mode photoluminescence under an electric field in a tape-casting-based Er-doped K0.5Na0.5NbO3 laminar ceramic

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Article information


Submitted
12 Mar 2019
Accepted
14 May 2019
First published
16 May 2019

J. Mater. Chem. C, 2019,7, 7885-7892
Article type
Paper

In situ boost and reversible modulation of dual-mode photoluminescence under an electric field in a tape-casting-based Er-doped K0.5Na0.5NbO3 laminar ceramic

J. Lin, Q. Lu, X. Wu, H. Sun, C. Lin, T. Lin, K. Xue, X. Miao, B. Sa and Z. Sun, J. Mater. Chem. C, 2019, 7, 7885
DOI: 10.1039/C9TC01356C

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