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Enhanced luminescence and structure evolution of double perovskite (K, Na)LaMgWO6:Eu3+ phosphor for white LEDs

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Abstract

Double perovskite KLaMgWO6:Eu3+ phosphors were successfully synthesized by an improved sol–gel method using citric acid and polyethylene glycol as complexing agents. The structure evolution and photoluminescence were systematically invested by X-ray diffraction, Rietveld refinement and fluorescence spectra. The structure of Eu3+ doped samples was double-perovskite with space group C2/m. Enhanced luminescence properties were gotten by adding 5.0 wt% PEG. Na+ with smaller radius was selected to substitute K+ in this novel host. With increasing the concentration of Na+, the tolerance factors decreased and the structure of BO6 tilted gradually and lowered structure symmetry. Then the emission intensity ratio of 5D0–7F2/5D0–7F1 transition increased and the red emission played the dominate role. Also the emission intensity was enhanced by increasing the concentration of Na+. The phosphors showed better color purity with better CIE chromaticity coordinates. Therefore the synthesized phosphors is a potential light conversion red material for light emitting diode.

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Acknowledgments

The author acknowledge the generous financial support from Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and National Natural Science Foundation of China (51402133, 51202111).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, China

    Quan Liu, Lixi Wang & Qitu Zhang

  2. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116, China

    Le Zhang & Hao Yang

  3. Institute 53 of China’s Ordnance Industry, Jinan, 250031, Shandong, China

    Mingxun Yu

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  1. Quan Liu
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  2. Lixi Wang
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  3. Le Zhang
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  4. Hao Yang
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Correspondence to Qitu Zhang.

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Liu, Q., Wang, L., Zhang, L. et al. Enhanced luminescence and structure evolution of double perovskite (K, Na)LaMgWO6:Eu3+ phosphor for white LEDs. J Mater Sci: Mater Electron 26, 8083–8088 (2015). https://doi.org/10.1007/s10854-015-3466-5

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  • DOI: https://doi.org/10.1007/s10854-015-3466-5

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