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    Researchers demonstrate optical cooling using cesium lead trihalide nanocrystals. This phenomenon, one photon up-conversion photoluminescence, achieved significant temperature reduction in the material and its surroundings.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • One photon up-conversion photoluminescence (OPU) involves a material emitting higher-energy photons than absorbed, utilizing thermal energy.
    • Efficient OPU can lead to optical cooling, a net decrease in the material's temperature.
    • The temperature-dependent yield of OPU makes it a potential thermometer.

    Purpose of the Study:

    • To demonstrate optical cooling in colloidal semiconductor nanocrystals.
    • To investigate the use of cesium lead trihalide nanocrystals for optical cooling.
    • To verify temperature reduction using Raman thermometry.

    Main Methods:

    • Utilizing cesium lead trihalide nanocrystals.
    • Employing 532 nm continuous-wave (CW) laser excitation.
    • Performing Raman thermometric analysis on the substrate.

    Main Results:

    • Cesium lead trihalide nanocrystals exhibited optical cooling during OPU.
    • A temperature decrease of up to 25 °C was measured in the local environment.
    • This marks the first demonstration of optical cooling via colloidal semiconductor nanocrystal OPU.

    Conclusions:

    • Colloidal semiconductor nanocrystals can effectively drive optical cooling.
    • Cesium lead trihalide nanocrystals are promising candidates for optical cooling applications.
    • This study opens new avenues for temperature control using photoluminescent materials.