5 years ago

Bright Photon Upconversion on Composite Organic Lanthanide Molecules through Localized Thermal Radiation

Bright Photon Upconversion on Composite Organic Lanthanide Molecules through Localized Thermal Radiation
Thomas Osipowicz, Huanqing Ye, Qihua Xiong, Saumitra Vajandar, Viktor Bogdanov, Sheng Liu, Ignacio Hernández
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/cm2) 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 perfluoroimidodiphosphinates. The IR-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.

Publisher URL: http://dx.doi.org/10.1021/acs.jpclett.7b02513

DOI: 10.1021/acs.jpclett.7b02513

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