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Nano Lett. 2017 Mar 8;17(3):1319-1325. doi: 10.1021/acs.nanolett.6b03212. Epub 2017 Jan 31.

Direct Patterning of Colloidal Quantum-Dot Thin Films for Enhanced and Spectrally Selective Out-Coupling of Emission.

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1
Optical Materials Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich , 8092 Zurich, Switzerland.

Abstract

We report on a template-stripping method for the direct surface patterning of colloidal quantum-dot thin films to produce highly luminescent structures with feature sizes less than 100 nm. Through the careful design of high quality bull's-eye gratings we can produce strong directional beaming (10° divergence) with up to 6-fold out-coupling enhancement of spontaneous emission in the surface-normal direction. A transition to narrow single-mode lasing is observed in these same structures at thresholds as low as 120 μJ/cm2. In addition, we demonstrate that these structures can be fabricated on flexible substrates. Finally, making use of the size-tunable character of colloidal quantum dots, we demonstrate spectrally selective out-coupling of light from mixed quantum-dot films. Our results provide a straightforward route toward significantly improved optical properties of colloidal quantum-dot assemblies.

KEYWORDS:

Quantum dot; lasing; photonics; template stripping

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