Publication

Inkjet-Printed Multicolor Arrays of Highly Luminescent Nanocrystal-Based Nanocomposites

Jürgen Brugger, Vahid Fakhfouri, Joo Yeon Kim
2009
Journal Articles

Abstract

Inkjet technology is a compelling method for the flexible and cost-effective printing of functional inks. We show that nanocomposite solutions based on polystyrene and differently sized core/shell-type nanocrystals (NCs) formed by a CdSe core coated with a shell of ZnS (CdSe@ZnS) in a single solvent, chloroform, can be reliably dispensed into luminescent,multicolor pixel arrays. This study demonstrates the relevance of parameters like polymer concentration and nozzle diameter, highlighting how the optimal conditions to print NCs embedded in 5 wt% polystyrene nanocomposite are given by a 70-mmdiameter nozzle. The obtained structures show that the bright size- dependent emission of the NCs in the nanocomposite is retained in the printed pixels.

Official source

https://infoscience.epfl.ch/entities/publication/2d851574-6654-48fc-8340-7d81cffa43ed

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Jürgen Brugger, Vahid Fakhfouri, Joo Yeon Kim
2009
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2d851574-6654-48fc-8340-7d81cffa43ed

About this result

Related concepts (15)

Quantum dot

Quantum dots (QDs) – also called semiconductor nanocrystals, are semiconductor particles a few nanometres in size, having optical and electronic properties that differ from those of larger particles as a result of quantum mechanics. They are a central topic in nanotechnology and materials science. When the quantum dots are illuminated by UV light, an electron in the quantum dot can be excited to a state of higher energy. In the case of a semiconducting quantum dot, this process corresponds to the transition of an electron from the valence band to the conductance band.

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A heterojunction is an interface between two layers or regions of dissimilar semiconductors. These semiconducting materials have unequal band gaps as opposed to a homojunction. It is often advantageous to engineer the electronic energy bands in many solid-state device applications, including semiconductor lasers, solar cells and transistors. The combination of multiple heterojunctions together in a device is called a heterostructure, although the two terms are commonly used interchangeably.

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