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Open Access Green as soon as Postprint is submitted to ZB.
Direct patterning of colloidal quantum-dot thin films for enhanced and spectrally selective out-coupling of emission.
Nano Lett. 17, 1319-1325 (2017)
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/cm. 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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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Quantum Dot ; Lasing ; Photonics ; Template Stripping
ISSN (print) / ISBN
1530-6984
e-ISSN
1530-6992
Journal
Nano Letters
Quellenangaben
Volume: 17,
Issue: 3,
Pages: 1319-1325
Publisher
American Chemical Society (ACS)
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Helmholtz Pioneer Campus (HPC)