Smart Optical Composite Materials: Dispersions of Metal-Organic Framework@Superparamagnetic Microrods for Switchable Isotropic-Anisotropic Optical Properties
Mandel K, Granath T, Wehner T, Rey M, Stracke W, Vogel N, Sextl G, Mueller-Buschbaum K (2017)
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2017
Journal
Publisher: American Chemical Society
Book Volume: 11
Pages Range: 779-787
Journal Issue: 1
Abstract
A smart optical composite material with dynamic isotropic and anisotropic optical properties by combination of luminescence and high reflectivity was developed. This combination enables switching between luminescence and angle-dependent reflectivity by changing the applied wavelength of light. The composite is formed as anisotropic core/shell particles by coating superparamagnetic iron oxide-silica microrods with a layer of the luminescent metal-organic framework (MOF) 3$ınfty$[Eu2(BDC)3]·2DMF·2H2O (BDC2- = 1,4-benzenedicarboxylate). The composite particles can be rotated by an external magnet. Their anisotropic shape causes changes in the reflectivity and diffraction of light depending on the orientation of the composite particle. These rotation-dependent optical properties are complemented by an isotropic luminescence resulting from the MOF shell. If illuminated by UV light, the particles exhibit isotropic luminescence while the same sample shows anisotropic optical properties when illuminated with visible light. In addition to direct switching, the optical properties can be tailored continuously between isotropic red emission and anisotropic reflection of light if the illuminating light is tuned through fractions of both UV and visible light. The integration and control of light emission modes within a homogeneous particle dispersion marks a smart optical material, addressing fundamental directions for research on switchable multifunctional materials. The material can function as an optic compass or could be used as an optic shutter that can be switched by a magnetic field, e.g., for an intensity control for waveguides in the visible range.
Authors with CRIS profile
Karl Mandel
Tim Granath
Marcel Rey Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Nicolas Vogel Professur für Partikelsynthese
Tim Granath
Marcel Rey Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Nicolas Vogel Professur für Partikelsynthese
Additional Organisation(s)
Involved external institutions
Fraunhofer Institut für Silicatforschung (ISC)
Germany (DE)
Julius-Maximilians-Universität Würzburg
Germany (DE)
Germany (DE)
Julius-Maximilians-Universität Würzburg
Germany (DE)
How to cite
APA:
Mandel, K., Granath, T., Wehner, T., Rey, M., Stracke, W., Vogel, N.,... Mueller-Buschbaum, K. (2017). Smart Optical Composite Materials: Dispersions of Metal-Organic Framework@Superparamagnetic Microrods for Switchable Isotropic-Anisotropic Optical Properties. Acs Nano, 11(1), 779-787. https://dx.doi.org/10.1021/acsnano.6b07189
MLA:
Mandel, Karl, et al. "Smart Optical Composite Materials: Dispersions of Metal-Organic Framework@Superparamagnetic Microrods for Switchable Isotropic-Anisotropic Optical Properties." Acs Nano 11.1 (2017): 779-787.
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