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Optical and reliability properties studies of Sr4Al14O25:Eu2+ film for high-CRI white LEDs

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Abstract

This study is aimed at obtaining a relatively higher-color-rendering index (CRI) white LED using a blue-emitting Sr4Al14O25:Eu2+ phosphor that could smooth out LED flicker. In order to study the luminescence of the phosphors in the LED package, a thin Sr4Al14O25:Eu2+ film and three-phosphors-containing (green YAG:Ce3+, red CASN:Eu2+, and indigo Sr4Al14O25:Eu2+) film were prepared using a spin coating method. Meanwhile, three-phosphors-LED package was fabricated using a dispensing process, whereby the chip surface was automatically leveled to form a film with the same composition and components as that of the three-phosphors-containing film. In order to study the reliability of Sr4Al14O25:Eu2+ phosphors in the resin, high-temperature and high-humidity test, Xenon lamp aging test, and thermal cycling test were carried out. The Sr4Al14O25:Eu2+ phosphors in the resin were also characterized through photoluminescence (PL) and PL decay curve analyses. The electroluminescence, correlated color temperature, and temperature-dependent PL of the three-phosphors-containing film were measured using an integrating sphere. The three-phosphors-containing film displayed high reliability and thermal stability. The blue LED was coated with a three-phosphors-containing film, which led to a correlated color temperature of ~ 4500 K and a high CRI (Ra > 90.2).This LED package had an afterglow light that could eliminate the observed LED flicker.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (61901270), the Shanghai Sailing Program (17YF1419200), and the Science and Technology Planning Project of Zhejiang Province, China (2018C01046)

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Authors and Affiliations

  1. School of Science, Shanghai Institute of Technology, Shanghai, 201418, People’s Republic of China

    Li Wang, Wei Wang, Zhaojiang Shang, Peiyuan Cao, Mingming Shi, Bobo Yang & Jun Zou

  2. Institute of New Materials & Industrial Technology, Wenzhou University, Wenzhou, 325024, People’s Republic of China

    Jun Zou

  3. Institute of Future Lighting, Academy for Engineering and Technology, Fudan University, Shanghai, 200433, People’s Republic of China

    Bobo Yang

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  1. Li Wang
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  2. Wei Wang
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  3. Zhaojiang Shang
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Correspondence to Zhaojiang Shang or Jun Zou.

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Wang, L., Wang, W., Shang, Z. et al. Optical and reliability properties studies of Sr4Al14O25:Eu2+ film for high-CRI white LEDs. J Mater Sci: Mater Electron 31, 13561–13569 (2020). https://doi.org/10.1007/s10854-020-03912-8

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  • DOI: https://doi.org/10.1007/s10854-020-03912-8

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