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Understanding the luminescence in Yb3+ co-doped Sialon: Eu2+/Eu3+ transparent phosphor ceramic plate

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Abstract

The transparent Sialon phosphor ceramic plates were fabricated with varying amounts of Yb2O3 and Eu2O3. The hot press sintering technique was used to sinter the compact powders. The fabricated samples with the highest Yb2O3 concentration (10 wt%) and lowest Eu2O3 concentration (1 wt%) show a dominant α-Sialon phase, whereas the highest Eu2O3 (8 wt%) and lowest Yb2O3 (3 wt%) containing sample shows composite α/β-Sialon phases as confirmed by the XRD analysis. The light transmittance was measured for 0.1 mm thick samples. The maximum light transmission of 60% was observed at 800 nm wavelength for the highest Yb2O3 added Sialon ceramics. Also, the higher Yb2O3 and lower Eu2O3 containing samples show a sharp orange luminescence at 590 nm, attributed to the parity allowed magnetic dipole induced 5D0 → 7F1 transition of the Eu3+. These samples also produced upconversion luminescence as irradiated by 980 nm wavelength. The sample with the highest Eu2O3 addition exhibits broad greenish-yellow down-conversion emission with a sharp emission at 590 nm for composite α/β-Sialon phases. The recorded broad emission ranges from green to red, offering a wide spectrum of visible light for lighting applications.

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Acknowledgements

I would like to acknowledge Professor S. W. Lee from the Department of Environmental and Bio-Chemical Engineering, Sun Moon University, South Korea, for providing the laboratory facilities.

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Authors and Affiliations

  1. Department of Fusion Science and Technology, Sun Moon University, Chungnam, 31460, Republic of Korea

    Bhupendra Joshi & Gobinda Gyawali

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  1. Bhupendra Joshi
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  2. Gobinda Gyawali
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Correspondence to Bhupendra Joshi.

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Joshi, B., Gyawali, G. Understanding the luminescence in Yb3+ co-doped Sialon: Eu2+/Eu3+ transparent phosphor ceramic plate. J. Korean Ceram. Soc. 59, 329–337 (2022). https://doi.org/10.1007/s43207-021-00176-8

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  • DOI: https://doi.org/10.1007/s43207-021-00176-8

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