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Cation Vacancy Repair for Enhancement of Orange-Yellow Luminescence in the Sr9Mg1.5-xKx(PO4)7:Eu2+ Phosphors

Abstract

Many approaches have contributed to improve luminescence properties of phosphors, including surface coating, direct reduction and charge compensation, which involved in reducing the inner or surface defects of luminescent particles. In this study, we propose a cation vacancy repair strategy to successfully improve orange-yellow luminescence properties of the Sr9Mg1.5(PO4)7:Eu2+ phosphor. Main idea of the strategy is that introducing K+ repairs the vacancy at Mg(1) site according to formula Mg_Mg^+ □_Mg^(∙∙)+2K^+ = K_Mg^'+ K_□^'+ Mg^(2+). As a result, the luminescence of the repaired phosphate phosphor is enhanced by 2.5 times, and the internal and external quantum efficiency significantly increases by 50.5% and 55.4%, respectively. Additionally, the thermal stability is also a little improved. The enhancement mechanisms in luminescence are discussed in detail based on the investigations of microstructure, luminescence spectra, decay curves and concentration using various analysis techniques. We find that the low luminescence efficiency is due to the existence of vacancy defects in the phosphor. Through using the repaired Sr9MgK(PO4)7:Eu2+ phosphor, the white LED package demonstrates a low correlated color temperature (~ 2900 K), high color rendering index (~ 90) and R9 > 91. We expect that the strategy proposed herein would improve luminescence for other phosphors with vacancy defects.

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Publication details

The article was received on 14 Apr 2018, accepted on 10 Sep 2018 and first published on 13 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC01756E
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Cation Vacancy Repair for Enhancement of Orange-Yellow Luminescence in the Sr9Mg1.5-xKx(PO4)7:Eu2+ Phosphors

    L. Yu, H. Yan, Y. Fan, J. Zhang, Y. Chen, F. Pan, W. Zhou, S. Lian and Z. Ma, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01756E

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