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Effects of graphene quantum dots coating on the luminescence properties of K2SiF6:Mn4+ red-emitting phosphors

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Abstract

A series of K2SiF6:0.06Mn4+@ GQDs y mg/mol (KSF: K2SiF6, GQDs: graphene quantum dots) red-emitting phosphors were prepared with a simple coating method. Experimental results show that the KSF:0.06Mn4+@ GQDs y mg/mol has broad excitation bands in blue region and strong emission line bands in red region with the strongest peak at ~ 630 nm. Enhanced luminescence intensity and thermal stability induced by GQD coating are observed: (i) the integrated intensity of KSF:0.06Mn4+@ GQDs 5mg/mol is 1.32 times of that of KSF:0.06Mn4+, (ii) the integrated intensities of KSF:0.06Mn4+@ GQDs 5mg/mol at 120 and 180 °C are 1.57 and 1.26 times of that at 25 °C. Through temperature-dependent behavior measurement and stability test, it can distinctly learn that KSF:0.06Mn4+@GQDs 5 mg/mol exhibits exceptional thermal stability as well as color stability under LED-operating temperature conditions, which implies that the sample has potential applications for blue light-based warm W-LEDs.

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Acknowledgements

This research is supported by the National Natural Science Foundation of China (Grant No. 21561003, No. 21661006 and No. 21965004), the Scientific Research Foundation of Guangxi University (Grant No. XDZ140116), the open foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University (Grant No. 2019GXYSOF03), the innovation Project of Guangxi Graduate Education (Grant No. YCSW2019031), the Students Experimental Skills and Innovation Ability Training Fund Project of Guangxi University (No. 201710593183 and No. 201910593177).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, Guangxi, China

    Youmiao Liu, Yuelan Li, Yutong Feng, Sen Liao, Yingheng Huang & Huaxin Zhang

  2. Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, Guangxi, China

    Jianming Meng, Sen Liao & Yingheng Huang

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  1. Youmiao Liu
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Correspondence to Sen Liao.

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Liu, Y., Li, Y., Feng, Y. et al. Effects of graphene quantum dots coating on the luminescence properties of K2SiF6:Mn4+ red-emitting phosphors. J Mater Sci: Mater Electron 31, 444–456 (2020). https://doi.org/10.1007/s10854-019-02547-8

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