PhD position available
Quantum Dots for On Chip Luminescent Downconversion
A 4 years PhD position is available at Physics & Chemistry of Nanostructures (PCN) of Ghent University, Belgium.
Colloidal quantum dots (QDs) are semiconductor nanocrystals in the 1 to 10 nm size range synthesized by wet chemistry. Much like atoms and molecules, QDs exhibit discrete transitions with energy levels that are strongly dependent on the QDs size. This unique property has made that QDs are now widely studied as a novel class of opto-electronic materials. The most advanced application of colloidal QDs, at least from a research valorization perspective, is their commercial use in liquid crystal displays. Here, the use of QDs as luminescent wavelength convertors strongly enhances the display color gamut as compared to traditional displays. The most common QDs active at visible wavelengths involve cadmium based materials since they are relatively easy to synthesize with high quality luminescent properties. However, cadmium is a toxic heavy metal that is restricted by the European Commission in its ROHS directive. A further extension of the use of QDs therefore requires non-toxic and environmental friendly materials.
You will work as a PhD researcher within the framework of QDOCCO, a large scale research project involving several research institutes in Flanders and supported by a user committee of industrial partners, that aims at the development of a new generation of Cd-free QDs for on-chip downconversion. The research will build on the expertise in the synthesis of III-V QDs as developed at PCN since 2013. For the moment, this involves the formation of InP and InAs QDs by means of cheap and safe-to-use precursors, where in particular InP-based QDs can be implemented into lightemitting devices.1–4 Within QDOCCO, we aims to extend these synthesis protocols to other III-V compounds that contain Al as the group III metal. This entails the design of new synthetic approaches that start from the selection of the molecular precursors to the control of nucleation and growth. The final goal is to obtain size-tunable and strain-free aluminum-based QDs that exhibit high quality emission properties. For this research, you will make use of the standard methods for structural and optical characterization of nanocrystals, including electron microscopy, x-ray diffraction, UV-Vis absorption and luminescence spectroscopy.
You have recently obtained a master degree in chemistry and/or material sciences. A background in chemical synthesis, either organic or inorganic is a plus.
Applications should be sent to:
Prof. Zeger Hens / Dr. Mickael D. Tessier
zeger.hens [at] UGent.be / mickael.tessier [at] ugent.be
Physics and Chemistry of Nanostructures
(1) Tessier, M. D.; Dupont, D.; De Nolf, K.; De Roo, J.; Hens, Z. Chem. Mater. 2015, 27, 4893–4898.
(2) Tessier, M. D.; De Nolf, K.; Dupont, D.; Sinnaeve, D.; De Roo, J.; Hens, Z. J. Am. Chem. Soc. 2016, 138, 5923–5929.
(3) Grigel, V.; Dupont, D.; De Nolf, K.; Hens, Z.; Tessier, M. D. J. Am. Chem. Soc. 2016, 138, 13485–13488.
Spontaneous applications can be sent to Prof. Z. Hens.
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