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Effect of sintering temperature on the emission-spectrum-shape-evolution of Sr2SiO4:Eu2+ phosphor

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Abstract

Color rendering index and color temperature are the key factors for the LEDs application. The two points are closely related to the emission spectrum shape of phosphors. As the key factors for the LEDs application, both the above aspects are closely dependent on the emission spectrum shape of phosphors. In this study, the emission spectrum shape has been adjusted via a home designed route. A combination of structural, morphological, and optical characterization techniques has been used to study the shape evolution mechanism. The structural results show that the Sr2SiO4 phase has not been changed with the sintering temperature increasing, but the emission spectrum shape has changed dramatically, meanwhile, the colorimetric coordinate moves from blue-green to green region. Gaussian fitting method has been used to treat the emission spectrum, and the as-obtained results indicate the emission spectrum contains two single bands, which come from the 4f7(7S7/2)–4f6(7FJ)5d1 transition of Eu2+ on the different Sr sites in the Sr2SiO4 crystal. The intensity of the two single bands is driven by sintering temperature, because of the difference between the energy barrier of the Eu2+ occupying the different Sr sites in the matrix crystal. Moreover, the mechanism of the above phenomenon has also been studied by means of first principles method, and the obtained results agree well with the former deduction.

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Acknowledgements

This work was supported by the Natural Science Foundation of China (51302330, 51702033), open project foundation of Chongqing Key Laboratory of Micro/Nano Materials Engineering and Technology (KFJJ1302, KF201609), the Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJ1601116, KJ1501126), the Basic and Frontier Research Program of Chongqing Municipality (cstc2017jcyjAX0405, cstc2017jcyjAX0141), the Talent Introduction Project of Chongqing University of Arts and Sciences (R2015XC05) and the General Project of Chongqing University of Arts and Sciences (Y2016XC51). The calculation work was finished in the Shenzhen Cloud Computing Center.

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Authors and Affiliations

  1. Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Yongchuan, Chongqing, 402160, China

    Cong Zhao, Yong Pu, Shi-xiu Cao, Xiao-long Jing, Shan-yong Chen, Ling-ling Peng, Ting Lu & Dian-yong Tang

  2. College of Material Science and Engineering, Sichuan University, Chengdu, 610065, Sichuan, China

    Da-chuan Zhu

  3. School of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou, 450007, Henan, China

    Ming-xing Ma

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  1. Cong Zhao
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  2. Yong Pu
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  3. Shi-xiu Cao
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Correspondence to Shi-xiu Cao, Shan-yong Chen or Da-chuan Zhu.

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Zhao, C., Pu, Y., Cao, Sx. et al. Effect of sintering temperature on the emission-spectrum-shape-evolution of Sr2SiO4:Eu2+ phosphor. J Mater Sci: Mater Electron 29, 13588–13595 (2018). https://doi.org/10.1007/s10854-018-9486-1

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  • DOI: https://doi.org/10.1007/s10854-018-9486-1

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