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