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Related Experiment Video

Updated: Jul 23, 2025

Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion
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Variable ratio blue/red upconversion in Yb3+-Tm3+ codoped fluorosilicate glasses.

Xin Wang, Ke Tian, Haiyan Zhao

    Optics Letters
    |July 14, 2023
    PubMed
    Summary

    Controlling simultaneous blue and red light emission from Ytterbium-Thulium (Yb3+-Tm3+) doped glasses is challenging. This study shows that adjusting silica content in fluorosilicate glasses tunes the blue-to-red upconversion (UC) emission ratio.

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    Area of Science:

    • Materials Science
    • Photonics
    • Luminescence

    Background:

    • Simultaneous blue and red light emission via upconversion (UC) from a single excitation wavelength is difficult due to large photon energy differences.
    • Controlling the ratio of blue to red emission in Ytterbium-Thulium (Yb3+-Tm3+) codoped materials is crucial for tunable luminescence applications.

    Purpose of the Study:

    • To investigate the influence of host glass silica content on the blue-to-red UC emission ratio in Yb3+-Tm3+ codoped fluorosilicate glasses (FSGs).
    • To elucidate the underlying UC mechanisms governing the blue and red emission dominance.

    Main Methods:

    • Fabrication of Yb3+-Tm3+ codoped fluorosilicate glasses with varying silica content.
    • Characterization using 980-nm laser excitation, photoluminescence spectroscopy, and Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDS).

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    Last Updated: Jul 23, 2025

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    Main Results:

    • The blue-to-red UC emission ratio is demonstrably dependent on the silica content of the FSG host.
    • Analysis indicates that the cross-relaxation (CR) process (1G4 + 3F2 → 3H6 + 3F4) plays a pivotal role in determining whether blue or red emission predominates.
    • SEM-EDS confirmed the composition and homogeneity of the fabricated glass samples.

    Conclusions:

    • The silica content in FSGs is a critical factor for tuning the blue-to-red upconversion emission ratio in Yb3+-Tm3+ systems.
    • Understanding and controlling the CR process probability offers a pathway to achieve variable upconversion luminescence.
    • This research provides a foundation for developing novel materials for tunable UC luminescence applications.