Highly Ordered 2D-Assemblies of Phase-Segregated Block Molecules for Upconverted Linearly Polarized Emission
| Autor: | Jaime Gómez Rivas, Bas F. M. de Waal, Martin H.C. van Son, Ghislaine Vantomme, Anton Matthijs Berghuis, E. W. Meijer, Fabian Eisenreich |
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| Přispěvatelé: | Macro-Organic Chemistry, Surface Photonics, Photonics and Semiconductor Nanophysics, Macromolecular and Organic Chemistry, ICMS Business Operations, Institute for Complex Molecular Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
linearly polarized emission
Materials science Annealing (metallurgy) triplet energy migration Mechanical Engineering Doping 2D-assemblies 02 engineering and technology photon upconversion Chromophore 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Photon upconversion triplet–triplet annihilation 0104 chemical sciences Mechanics of Materials Chemical physics Microscopy Molecule General Materials Science 0210 nano-technology Excitation Order of magnitude |
| Zdroj: | Advanced Materials, 32(48):2004775. Wiley-VCH Verlag |
| ISSN: | 0935-9648 |
| Popis: | Materials based on the laminar ordering of self-assembled molecules have a unique potential for applications requiring efficient energy migration through densely packed chromophores. Here, employing molecular assemblies of coil–rod–coil block molecules for triplet–triplet annihilation upconversion (TTA-UC) based on triplet energy migration with linearly polarized emission is reported. By covalently attaching discrete-length oligodimethylsiloxane (oDMS) to 9,10-diphenylanthracene (DPA), highly ordered 2D crystalline DPA sheets separated by oDMS layers are obtained. Transparent films of this material doped with small amounts of triplet sensitizer PtII octaethylporphyrin show air-stable TTA-UC under non-coherent excitation. Upon annealing, an increase in TTA-UC up to two orders of magnitude is observed originating from both an improved molecular ordering of DPA and an increased dispersion of the sensitizer. The molecular alignment in millimeter-sized domains leads to upconverted linearly polarized emission without alignment layers. By using a novel technique, upconversion imaging microscopy, the TTA-UC intensity is spatially resolved on a micrometer scale to visually demonstrate the importance of molecular dispersion of sensitizer molecules for efficient TTA-UC. The reported results are promising for anti-counterfeiting and 3D night-vision applications, but also exemplify the potential of discrete oligodimethylsiloxane functionalized chromophores for highly aligned and densely packed molecular materials. |
| Databáze: | OpenAIRE |
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