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Prins, F.* ; Kim, D.K.* ; Cui, J. ; De Leo, E.* ; Spiegel, L.L.* ; McPeak, K.M.* ; Norris, D.J.*

Direct patterning of colloidal quantum-dot thin films for enhanced and spectrally selective out-coupling of emission.

Nano Lett. 17, 1319-1325 (2017)

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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° 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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