Journal
NANO LETTERS
Volume 17, Issue 3, Pages 1319-1325Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03212
Keywords
Quantum dot; photonics; lasing; template stripping
Categories
Funding
- European Research Council under the European Union's Seventh Framework Program (FP)/ERC [339905]
- Ambizione program of the Swiss National Science Foundation
- ETH Zurich Postdoctoral Fellowship Program
- Marie Curie Actions for People COFUND Program
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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 degrees 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 mu J/cm(2). 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.
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