Journal
MATERIALS HORIZONS
Volume 2, Issue 1, Pages 120-124Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4mh00168k
Keywords
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Funding
- Swiss National Foundation SNF [135405, 152968]
- Adolphe Merkle Foundation
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We herein report new organogels that permit efficient optical upconversion (UC) by triplet-triplet annihilation. Thematerials studied consist of a liquid organic phase, composed of a mixture of N, N-dimethylformamide and dimethyl sulfoxide in which the UC chromophore pair Pd(II) mesoporphyrin IX and 9,10-diphenylanthracene was dissolved, and a three-dimensional polymer network formed by covalently cross-linking polyvinyl alcohol) with hexamethylene diisocyanate. The new gels are highly transparent, shape-persistent, and display efficient green-to-blue upconversion with UC quantum yields of > 0.6 and 14% under ambient and oxygen-free conditions, respectively. The design approach presented here permits the fabrication of a hitherto unexplored class of materials with a unique combination of properties. The framework can easily be extended to other materials based on other solvents, polymer networks, and/or chromophore pairs.
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