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- W2022602852 endingPage "8207" @default.
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- W2022602852 abstract "The development of solid materials which are able to upconvert optical radiation into photons of higher energy is attractive for many applications such as photocatalytic cells and photovoltaic devices. However, to fully exploit triplet–triplet annihilation photon energy upconversion (TTA-UC), oxygen protection is imperative because molecular oxygen is an ultimate quencher of the photon upconversion process. So far, reported solid TTA-UC materials have focused mainly on elastomeric matrices with low barrier properties because the TTA-UC efficiency generally drops significantly in glassy and semicrystalline matrices. To overcome this limit, for example, combine effective and sustainable annihilation upconversion with exhaustive oxygen protection of dyes, we prepare a sustainable solid-state-like material based on nanocellulose. Inspired by the structural buildup of leaves in Nature, we compartmentalize the dyes in the liquid core of nanocellulose-based capsules which are then further embedded in a cellulose nanofibers (NFC) matrix. Using pristine cellulose nanofibers, a sustainable and environmentally friendly functional nanomaterial with ultrahigh barrier properties is achieved. Also, an ensemble of sensitizers and emitter compounds are encapsulated, which allow harvesting of the energy of the whole deep-red sunlight region. The films demonstrate excellent lifetime in synthetic air (20.5/79.5, O2/N2)—even after 1 h operation, the intensity of the TTA-UC signal decreased only 7.8% for the film with 8.8 μm thick NFC coating. The lifetime can be further modulated by the thickness of the protective NFC coating. For comparison, the lifetime of TTA-UC in liquids exposed to air is on the level of seconds to minutes due to fast oxygen quenching." @default.
- W2022602852 created "2016-06-24" @default.
- W2022602852 creator A5008948276 @default.
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- W2022602852 date "2014-07-23" @default.
- W2022602852 modified "2023-10-16" @default.
- W2022602852 title "Photon Energy Upconverting Nanopaper: A Bioinspired Oxygen Protection Strategy" @default.
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- W2022602852 doi "https://doi.org/10.1021/nn502496a" @default.
- W2022602852 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25019338" @default.
- W2022602852 hasPublicationYear "2014" @default.
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