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Multi-color solar absorption as a synergetic UV up-conversion enhancement mechanism in LiYF 4 :Yb 3+ ,Tm 3+ nanocrystals

Abstract : Motivated by the technologically important spectral conversion of sunlight for efficient photocatalysis, we present a detailed analysis of the multi-color excitation of LiYF 4 :Yb 3+ ,Tm 3+ nanocrystals leading to UV emission through upconversion. We demonstrate in particular that the combination of blue and IR light for generating upconversion UV emission is a linear mechanism that occurs at rather low density of excitation (a few mW/cm 2). This up-conversion efficiency is fully compatible with 1
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https://hal.archives-ouvertes.fr/hal-02393052
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Submitted on : Wednesday, December 4, 2019 - 11:23:02 AM
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Long-term archiving on: : Thursday, March 5, 2020 - 5:42:32 PM

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Bhagyesh Purohit, Yannick Guyot, David Amans, Marie-France Joubert, Benoit Mahler, et al.. Multi-color solar absorption as a synergetic UV up-conversion enhancement mechanism in LiYF 4 :Yb 3+ ,Tm 3+ nanocrystals. ACS photonics, American Chemical Society,, 2019, 6 (12), pp.3126-3131. ⟨10.1021/acsphotonics.9b01151⟩. ⟨hal-02393052⟩

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