Drop-on-demand inkjet printing of highly luminescent CdS and CdSe@ZnS nanocrystal based nanocomposites

Ingrosso, Chiara; Kim, Joo Yeon; Binetti, Enrico; Fakhfouri, V.; Striccoli, Marinella; Agostiano, Angela; Curri, M. Lucia; Brugger, Juergen

doi:10.1016/j.mee.2008.11.028

Cited by 18 publications

(10 citation statements)

References 8 publications

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“…Summarizing, spectroscopic investigation seems to indicate that the very rapid cation-exchange process reduces the PbS NC diameter from 2.3 nm of the native PbS NCs to 2.0 nm. It is worth recalling that, while CdS is a wide-gap semiconductor having emission in the blue-region of the spectrum and average PL lifetime of few nanoseconds, [ 62 ] PbS is a small-band gap semiconductor with PL in the NIR and average PL lifetime of a few microseconds. The obtained PbS–CdS NCs, characterized by a Cd excess (Cd/Pb = 1.5 from STEM-EDS), an hypothetical ternary PbCdS alloy, still in the quantum confinement regime and extended to the whole NC volume, would be expected to have spectroscopic properties very close to those of CdS, in contrast with experimental evidence [ 63 ].…”

Section: Resultsmentioning

confidence: 99%

Tuning light emission of PbS nanocrystals from infrared to visible range by cation exchange

Binetti

Striccoli

Sibillano

et al. 2015

Science and Technology of Advanced Materials

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Colloidal semiconductor nanocrystals, with intense and sharp-line emission between red and near-infrared spectral regions, are of great interest for optoelectronic and bio-imaging applications. The growth of an inorganic passivation layer on nanocrystal surfaces is a common strategy to improve their chemical and optical stability and their photoluminescence quantum yield. In particular, cation exchange is a suitable approach for shell growth at the expense of the nanocrystal core size. Here, the cation exchange process is used to promote the formation of a CdS passivation layer on the surface of very small PbS nanocrystals (2.3 nm in diameter), blue shifting their optical spectra and yielding luminescent and stable nanostructures emitting in the range of 700–850 nm. Structural, morphological and compositional investigation confirms the nanocrystal size contraction after the cation-exchange process, while the PbS rock-salt crystalline phase is retained. Absorption and photoluminescence spectroscopy demonstrate the growth of a passivation layer with a decrease of the PbS core size, as inferred by the blue-shift of the excitonic peaks. The surface passivation strongly increases the photoluminescence intensity and the excited state lifetime. In addition, the nanocrystals reveal increased stability against oxidation over time. Thanks to their absorption and emission spectral range and the slow recombination dynamics, such highly luminescent nano-objects can find interesting applications in sensitized photovoltaic cells and light-emitting devices.

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Section: Resultsmentioning

confidence: 99%

Tuning light emission of PbS nanocrystals from infrared to visible range by cation exchange

Binetti

Striccoli

Sibillano

et al. 2015

Science and Technology of Advanced Materials

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“…In contrast to conventional techniques (dip‐coating, spin‐coating, spray‐coating) the inkjet printing process exhibits benefits of faster manufacturability, a lower material to sample casualty rate, and the production of defined areas with less coating material. Plenty of scientists are using inkjet printing for the deposition of metal NCs or semiconductor NCs to manufacture structured electronic components for chip design and sensing . In addition, some works on laser induced 3D printing for the fabrication of porous materials can be found .…”

Section: Introductionmentioning

confidence: 99%

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

Lübkemann

Miethe

Steinbach

et al. 2019

Small

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Nanoparticle‐based voluminous 3D networks with low densities are a unique class of materials and are commonly known as aerogels. Due to the high surface‐to‐volume ratio, aerogels and xerogels might be suitable materials for applications in different fields, e.g. photocatalysis, catalysis, or sensing. One major difficulty in the handling of nanoparticle‐based aerogels and xerogels is the defined patterning of these structures on different substrates and surfaces. The automated manufacturing of nanoparticle‐based aerogel‐ or xerogel‐coated electrodes can easily be realized via inkjet printing. The main focus of this work is the implementation of the standard nanoparticle‐based gelation process in a commercial inkjet printing system. By simultaneously printing semiconductor nanoparticles and a destabilization agent, a 3D network on a conducting and transparent surface is obtained. First spectro‐electrochemical measurements are recorded to investigate the charge–carrier mobility within these 3D semiconductor‐based xerogel networks.

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“…The security ink is invisible under visible light; but, upon ultraviolet radiations, printed information can be read. These security inks are mostly based on the down-conversion effect, and primary materials, such as quantum dots (QDs), are used [ 6 , 7 , 8 ]. In fact, due to their wide band gaps, they easily absorb ultraviolet light.…”

Section: Introductionmentioning

confidence: 99%

Luminescent Ink Based on Upconversion of NaYF4:Er,Yb@MA Nanoparticles: Environmental Friendly Synthesis and Structural and Spectroscopic Assessment

Cao

Turrell

et al. 2021

Molecules

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NaYF4:Er,Yb upconversion luminescent nanoparticles (UCNPs) were prepared by hydrothermal methods at 180 °C for 24 h. The X-ray diffraction (XRD) and TEM (transmission electron microscopy) images show that the resulting 60 nm UCNPs possess a hexagonal structure. In this work, maleic anhydride (MA) was grafted on the surface of UCNPs to induce hydrophilic properties. The photoluminescence spectra (PL) show upconversion emissions centered around 545 nm and 660 nm under excitation at 980 nm. The luminescent inks, including UCNPs@MA, polyvinyl alcohol (PVA), deionized water (DI), and ethylene glycol (EG), exhibit suitable properties for screen printing, such as high stability, emission intensity, and tunable dynamic viscosity. The printed patterns with a height of 5 mm and a width of 1.5 mm were clearly observed under the irradiation of a 980 nm laser. Our strategy provides a new route for the controlled synthesis of hydrophilic UCNPs, and shows that the UCNPs@MAs have great potential in applications of anti-counterfeiting packing.

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Drop-on-demand inkjet printing of highly luminescent CdS and CdSe@ZnS nanocrystal based nanocomposites

Cited by 18 publications

References 8 publications

Tuning light emission of PbS nanocrystals from infrared to visible range by cation exchange

Tuning light emission of PbS nanocrystals from infrared to visible range by cation exchange

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

Luminescent Ink Based on Upconversion of NaYF4:Er,Yb@MA Nanoparticles: Environmental Friendly Synthesis and Structural and Spectroscopic Assessment

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