Up-conversion luminescence in LaF <inf>3</inf> :Ho <sup>3+</sup> via two-wavelength excitation for use in solar cells

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Journal Article
Journal of Materials Chemistry C, 2013, 1 (48), pp. 8023 - 8027
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An efficient broadband excited near-infrared to visible up-conversion is observed in LaF 3 :Ho 3+ as the result of a two-wavelength excitation. The visible up-conversion emission intensity is greatly enhanced upon simultaneous excitation at 970 nm and 1150 nm, due to an energy transfer up-conversion mechanism. Multi-wavelength excitation based on the ground-state absorption, excited-state absorption, and phonon-coupled absorption of rare-earth ions results in an efficient broadband excited up-conversion emission, which may provide a new approach to fully harvest NIR solar energy and has potential application in solar cells. © 2013 The Royal Society of Chemistry.
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