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Issue 20, 2015
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A highly efficient, orange light-emitting (K0.5Na0.5)NbO3:Sm3+/Zr4+ lead-free piezoelectric material with superior water resistance behavior

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Abstract

Multifunctional luminescent materials based on rare earth doped ferro-/piezoelectrics have attracted much attention due to their potential applications in novel multifunctional devices. Currently, it remains a challenge to fabricate these materials with high photoluminescence quantum yields, comparable to values obtained for traditional phosphors. Herein, we reported a highly efficient, orange light-emitting material with a superior water resistance behavior based on a (K0.5Na0.5)NbO3 (KNN) matrix co-doped with Sm3+ and Zr4+. The phase structure, composition, photoluminescence properties, thermal quenching and water resistance behavior of the samples were systematically studied. A significantly enhanced orange light-emission at 597 nm originating from the 4G5/26H7/2 transition of Sm3+ was observed by the introduction of Zr4+ ions, which can be well explained by the exchange charge model of the crystal field. Particularly we achieve a photoluminescence quantum yield as high as 53% and superior water resistance property almost maintaining the same PL intensity as before immersion after 80 h water immersion time for the composition of (K0.5Na0.5)0.99Sm0.01Nb0.09Zr0.01O3 under 407 nm n-UV light excitation. The QY value can be comparable to some commercial phosphors, such as Y2O2S/Y2O3:Eu3+. These findings show the great potential of the Sm3+/Zr4+ co-doped KNN material for future applications in white LEDs and novel multifunctional devices.

Graphical abstract: A highly efficient, orange light-emitting (K0.5Na0.5)NbO3:Sm3+/Zr4+ lead-free piezoelectric material with superior water resistance behavior

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Supplementary files

Article information


Submitted
31 Dec 2014
Accepted
18 Apr 2015
First published
20 Apr 2015

J. Mater. Chem. C, 2015,3, 5275-5284
Article type
Paper
Author version available

A highly efficient, orange light-emitting (K0.5Na0.5)NbO3:Sm3+/Zr4+ lead-free piezoelectric material with superior water resistance behavior

Q. Zhang, K. Chen, L. Wang, H. Sun, X. Wang and X. Hao, J. Mater. Chem. C, 2015, 3, 5275
DOI: 10.1039/C4TC02995J

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