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Noah Strobel Nikolaos Droseros Wolfgang Köntges Mervin Seiberlich Manuel Pietsch Stefan Schlisske Felix Lindheimer Rasmus R. Schröder Uli Lemmer Martin Pfannmöller Natalie Banerji Gerardo Hernandez-Sosa 《Advanced materials (Deerfield Beach, Fla.)》2020,32(12):1908258
Future lightweight, flexible, and wearable electronics will employ visible-light-communication schemes to interact within indoor environments. Organic photodiodes are particularly well suited for such technologies as they enable chemically tailored optoelectronic performance and fabrication by printing techniques on thin and flexible substrates. However, previous methods have failed to address versatile functionality regarding wavelength selectivity without increasing fabrication complexity. This work introduces a general solution for printing wavelength-selective bulk-heterojunction photodetectors through engineering of the ink formulation. Nonfullerene acceptors are incorporated in a transparent polymer donor matrix to narrow and tune the response in the visible range without optical filters or light-management techniques. This approach effectively decouples the optical response from the viscoelastic ink properties, simplifying process development. A thorough morphological and spectroscopic investigation finds excellent charge-carrier dynamics enabling state-of-the-art responsivities >102 mA W−1 and cutoff frequencies >1.5 MHz. Finally, the color selectivity and high performance are demonstrated in a filterless visible-light-communication system capable of demultiplexing intermixed optical signals. 相似文献
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Eric J. Henderson Adam J. Shuhendler Preethy Prasad Verena Baumann Florian Maier‐Flaig Daniel O. Faulkner Uli Lemmer Xiao Yu Wu Geoffrey A. Ozin 《Small (Weinheim an der Bergstrasse, Germany)》2011,7(17):2507-2516
Luminescent silicon nanocrystals (ncSi) are showing great promise as photoluminescent tags for biological fluorescence imaging, with size‐dependent emission that can be tuned into the near‐infrared biological window and reported lack of toxicity. Here, colloidally stable ncSi with NIR photoluminescence are synthesized from (HSiO1.5)n sol–gel glasses and are used in biological fluorescence imaging. Modifications to the thermal processing conditions of (HSiO1.5)n sol–gel glasses, the development of new ncSi oxide liberation chemistry, and an appropriate alkyl surface passivation scheme lead to the formation of colloidally stable ncSi with photoluminescence centered at 955 nm. Water solubility and biocompatibility are achieved through encapsulation of the hydrophobic alkyl‐capped ncSi within PEG‐terminated solid lipid nanoparticles. Their applicability to biological imaging is demonstrated with the in‐vitro fluorescence labelling of human breast tumor cells. 相似文献
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Mine Water and the Environment - Uranium was extracted in the Königstein uranium mine by in-situ leaching with sulfuric acid until 1990. The originally anoxic conditions in the ore body became... 相似文献