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Related Concept Videos

Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
09:03

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Published on: January 7, 2019

Optical-fiber temperature sensor based on upconversion-excited fluorescence.

H Berthou, C K Jörgensen

    Optics Letters
    |September 23, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Codoping heavy-metal fluoride glass with erbium and ytterbium enables infrared laser excitation of visible fluorescence. The intensity ratio of these fluorescence lines changes with temperature, offering a potential thermometer.

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    Area of Science:

    • Materials Science
    • Optics
    • Spectroscopy

    Background:

    • Rare-earth ion-doped glasses are crucial for optical applications.
    • Upconversion luminescence allows conversion of lower-energy photons to higher-energy ones.
    • Temperature-dependent optical properties are valuable for sensing applications.

    Purpose of the Study:

    • To investigate the upconversion luminescence of codoped heavy-metal fluoride glass.
    • To explore the temperature-sensing potential of the observed fluorescence lines.

    Main Methods:

    • Codoping a heavy-metal fluoride glass with erbium (Er) and ytterbium (Yb) ions.
    • Excitation using a semiconductor laser in the infrared region.
    • Analysis of the upconversion-induced visible fluorescence spectra.

    Main Results:

    • Observed two neighboring visible fluorescence lines from erbium ions due to upconversion.
    • Demonstrated that the intensity ratio of these fluorescence lines is a function of temperature.
    • Established a single-variable relationship between the intensity ratio and temperature.

    Conclusions:

    • Codoped heavy-metal fluoride glass exhibits temperature-sensitive upconversion luminescence.
    • This material system shows promise for optical thermometry applications.
    • The observed phenomenon provides a novel method for non-contact temperature measurement.