Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 23, Pages 5695-5699Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b02513
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Funding
- Singapore National Research Foundation [NRF-NRFI2015-03]
- Singapore Ministry of Education via an AcRF [MOE2013-T2-1-049, 2015-T1-001-175, RG113/16]
- EU (MC-CIG) [303535]
- Spanish MINECO [MAT2016-80438-P]
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Converting low-energy photons via thermal radiation can be a potential approach for utilizing infrared (IR) photons to improve photovoltaic efficiency. Lanthanide-containing materials have achieved great progress in IR-to-visible photon upconversion (UC). Herein, we first report bright photon, tunable wavelength UC through localized thermal radiation at the molecular scale with low excitation power density (<10 W/cm(2)) realized on lanthanide complexes of perfluorinated organic ligands. This is enabled by engineering the pathways of nonradiative de excitation and energy transfer in a composite of ytterbium and terbium perfluoroimidodi-phosphinates. The 1R-excited thermal UC and wavelength control is realized through the terbium activators sensitized by the ytterbium sensitizers having high luminescence efficiency. The metallic molecular composite thus can be a potential energy material in the use of the IR solar spectrum for thermal photovoltaic applications.
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