May. 24, 2018

Quasi-epitaxial Growth of [Ru(bpy)3]2+ by Confinement in Clay Nanoplatelets Yields Polarized Emission

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Cryogenic ion etched biosamples were prepared by Leica Microsystems to support research on polarized emission by orientation of photoluminescent organic molecules. In this article, the authors present a nano confinement strategy to control the spatial orientation and emission polarization of phosphorescent metal complexes.

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D. A. Kunz, M. J. Leitl, L. Schade, J. Schmid, B. Bojer, U. T. Schwarz, G. A. Ozin, H. Yersin, and J. Breu; Quasi-epitaxial Growth of [Ru(bpy)3]2+ by Confinement in Clay Nanoplatelets Yields Polarized Emission; Small 2015, 11, No. 7, 792–796


Methods to achieve polarized emission by orientation of photoluminescent organic molecules and materials [1] include Langmuir-Blodgett deposition, [2]  mechanical alignment, [3,4]  and liquid crystalline self-assembly. [5,6] Highly symmetrical and approximately spherical transition metal compounds can prove more difficult to be oriented. Physical vapor deposition is generally of limited suitability. In this context, intercalation of emitters into highly anisotropic layered host lattices, such as synthetic clays and layered double-hydroxides (LDHs) [7–10] has been shown to have potential for controlling molecule alignment on the nanoscale. Due to spatial restrictions in the interlayer space and the structure directing effect of the surface corrugation of the host lattice, emitters, as gen-erally any molecule, will be inevitably intercalated in a well-defined orientation [11–13] Furthermore, the adsorption onto clay platelets has been applied to create compatibility of dyes with usually incompatible dispersion media [14] For potential optoelectronic applications such as organic light emitting diodes (OLEDs) and optically pumped lasers devices, how-ever, sufficiently large (several µm) and delaminated (singular lamellae of 1 nm thickness) nanoplatelets are needed.

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