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

Bhagyesh Purohit (1, 2) , Yannick Guyot (1) , David Amans (1) , Marie-France Joubert (1) , Benoit Mahler (1) , Shashank Mishra (2) , Stéphane Daniele (2) , Christophe Dujardin (1) , Gilles Ledoux (1)

1 iLM - LUMINESCENCE - iLM - Luminescence
2 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

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

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Matériaux

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, 2019, 6 (12), pp.3126-3131. ⟨10.1021/acsphotonics.9b01151⟩. ⟨hal-02393052⟩