Nanocrystal‐Based Luminescent Composites for Nanoimprinting Lithography

Tamborra, M.; Striccoli, Marinella; Curri, M. Lucia; Alducin, J.A.; Mecerreyes, David; Pomposo, José A.; Kehagias, N.; Reboud, V.; Torres, C. M. Sotomayor; Agostiano, Angela

doi:10.1002/smll.200600690

Cited by 53 publications

(46 citation statements)

References 43 publications

(49 reference statements)

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“…25 However, while such techniques have yielded patterned cQD films for electronic applications 25 photonic structuring has not yet been reported. Finally, alternative strategies for printing, 26 patterning, 27 and soft-lithography 28,29 have been developed using matrix-embedded cQD films, though the use of such composite films has the distinct disadvantage of diluted emitter concentration, which inevitably places limitations on the emission intensity.…”

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confidence: 99%

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

et al. 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/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.

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confidence: 99%

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

et al. 2017

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“…Thiol groups are expected to coordinate the NC surface, partially replacing the pristine ligands, thus increasing the coordination degree of the NC surface and avoiding the aggregation of the nano-objects [34]. …”

Section: Resultsmentioning

confidence: 99%

Nanocomposites Based on Luminescent Colloidal Nanocrystals and Polymeric Ionic Liquids towards Optoelectronic Applications

et al. 2014

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Polymeric ionic liquids (PILs) are an interesting class of polyelectrolytes, merging peculiar physical-chemical features of ionic liquids with the flexibility, mechanical stability and processability typical of polymers. The combination of PILs with colloidal semiconducting nanocrystals leads to novel nanocomposite materials with high potential for batteries and solar cells. We report the synthesis and properties of a hybrid nanocomposite made of colloidal luminescent CdSe nanocrystals incorporated in a novel ex situ synthesized imidazolium-based PIL, namely, either a poly(N-vinyl-3-butylimidazolium hexafluorophosphate) or a homologous PIL functionalized with a thiol end-group exhibiting a chemical affinity with the nanocrystal surface. A capping exchange procedure has been implemented for replacing the pristine organic capping molecules of the colloidal CdSe nanocrystals with inorganic chalcogenide ions, aiming to disperse the nano-objects in the PILs, by using a common polar solvent. The as-prepared nanocomposites have been studied by TEM investigation, UV-Vis, steady-state and time resolved photoluminescence spectroscopy for elucidating the effects of the PIL functionalization on the morphological and optical properties of the nanocomposites.

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“…NIL capacity of direct imprinting functional materials have been widely exploited to control and enhance the spontaneous emission of organic [149,150] and composite emitters [151][152][153] and to structure organic electrodes [75,154,155] in flexible devices. Zhou et al showed a double imprinted white OLED made by phosphorescent emitters with a multilayer energy cascade [156].…”

Section: Organic Light Emitting Diodesmentioning

confidence: 99%

Nanoimprint Lithography: Toward Functional Photonic Crystals

Lova

Soci

2015

Organic and Hybrid Photonic Crystals

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In this chapter we review the use of nanoimprint lithography and its derivative soft-lithography techniques for the fabrication of functional photonic crystals. Nanoimprint is a viable, scalable, and cost-effective solution for large area patterning. While initially it relied primarily on pattern transfer from a rigid mold to a thermally softened polymer by embossing, in the last two decades the process evolved rapidly, giving rise to new technologies that allow direct imprint of functional materials such as conjugated polymers, metals, biological matter, and metal oxides. These advancements generated increasing interest in the use of nanoimprint lithography for the fabrication of photonic structures for light management in optoelectronic devices. After describing standard nanoimprint lithography and its derivative soft-lithography methods, we briefly discuss nanoimprint capabilities and prospects in photonic applications. In particular we review recent implementations of imprinted photonic structures for light management in organic light emitting diodes, solar cells, solid state lasers and sensors.

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Nanocrystal‐Based Luminescent Composites for Nanoimprinting Lithography

Cited by 53 publications

References 43 publications

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

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

Nanocomposites Based on Luminescent Colloidal Nanocrystals and Polymeric Ionic Liquids towards Optoelectronic Applications

Nanoimprint Lithography: Toward Functional Photonic Crystals

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