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The fabrication and optical property of WLED encapsulated with the graded-index fluorescent glass film

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Abstract

The refractive index difference between the packaging material and the chip in white light-emitting diode (WLED) is a key factor to increase the light transmission efficiency. In this work, multilayer gradient index fluorescent glass film was fabricated through screen printing technology and low temperature sintering method, and used to encapsulate the blue chip. Combining the Monte Carlo simulation with experiment data, the ratio of YAG: Ce3+ phosphor to matrix glass, and the thickness of graded-index fluorescent coating film were determined. The refractive index of multilayer glass was controlled to change from 1.60 to 1.83 through adjusting the Bi2O3 concentration. It is found that gradient refractive index fluorescent glass coating can effectively improve the transmittance of the packaging material and increase the luminous efficiency of WLED. In addition, encapsulating WLED with gradient refractive index fluorescent glass in place of organic materials can extend the life of WLEDs. This work revolves around the effect of gradient refractive index fluorescent glass coating on WLED performance and effectively improves its luminous efficiency.

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Acknowledgements

This work was supported by Jiangsu Natural Science Foundation for Excellent Young Scholar (BK20170101), and the Scientific Research Foundation of Nanjing University of Posts and Telecommunications (NY220011, NY220034), and the Opening Project of State Key Laboratory of Green Building Materials (2021GBM10).

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Authors and Affiliations

  1. College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China

    Min She, Yanyan Bu & Xiangfu Wang

  2. State Key Laboratory of Green Building Materials, China Building Materials Academy, No. 1 Guanzhuang Dongli, Chaoyang District, Beijing, 100024, China

    Xiangfu Wang

  3. College of Science, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China

    Yanyan Bu

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  1. Min She
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  2. Yanyan Bu
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Correspondence to Xiangfu Wang.

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She, M., Bu, Y. & Wang, X. The fabrication and optical property of WLED encapsulated with the graded-index fluorescent glass film. J Mater Sci: Mater Electron 33, 2406–2414 (2022). https://doi.org/10.1007/s10854-021-07448-3

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  • DOI: https://doi.org/10.1007/s10854-021-07448-3

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