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Low-temperature sintering coating of phosphor in TeO2–SiO2–B2O3–ZnO glass for enhanced luminous efficacy of white LED

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Abstract

A low-temperature sintering coating of phosphor in glass (PiG) is applied to white light-emitting diode (WLED) packaging to improve its luminous efficacy. The PiG coating is used for packaging and as a white light converter. In this work, the PiG is prepared by low-temperature sintering of mixed TeO2–SiO2–B2O3–ZnO (TSBZ) glass matrix and Y3Al5O12:Ce3+ (YAG:Ce3+) phosphor powders. The coating of PiG is successfully fabricated on borosilicate glass substrate through multilayer screen-printing and low-temperature sintering processes. Glass transition temperature (Tg) of TSBZ glass, microstructure and thermal stability, luminescence spectra, and optical performances of PiG coating are investigated. As the mole percentage of TeO2 decreases, the Tg decreases. The microstructure suggests that the lower melting point of the glass matrix provides better wettability. Locations of emission and excitation peaks of PiG are not shifted and intensity of that is strengthened under low-temperature sintering according to luminescence spectra. CIE chromaticity coordinates show that the lights from LED encapsulated with PiG are in white-light region. The luminous efficacy is enhanced by up to 26.7%. The PiG coating provides great potentials for the application in WLED packaging.

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Acknowledgements

The authors would like to express sincere thanks for the financial supports by the National Natural Science Foundation of China (51772224, 51372179), Innovation and Entrepreneurship Training Program of School of Materials Science and Engineering, Wuhan University of Technology (15).

Funding

This work was supported by the National Natural Science Foundation of China (51772224, 51372179).

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Authors and Affiliations

  1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China

    Hong Li, Jie Yang, Yong Zhuo, Peng Wang & Jingwei Li

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  1. Hong Li
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  2. Jie Yang
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Contributions

All authors contributed to the study conception and design. The conception of the study was contributed by HL. The experiment was carried out by JY and HL. Material preparation and data collection were performed by PW and JL. The data analysis and the first draft of the manuscript were completed by YZ, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Hong Li.

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Li, H., Yang, J., Zhuo, Y. et al. Low-temperature sintering coating of phosphor in TeO2–SiO2–B2O3–ZnO glass for enhanced luminous efficacy of white LED. J Mater Sci: Mater Electron 33, 11915–11925 (2022). https://doi.org/10.1007/s10854-022-08154-4

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