Publication date: 27th June 2014
Colloidal zero-dimensional semiconducting nanocrystals (NCs) have finally hit the market in large scale for display applications with the first quantum dots (QD)-enhanced TV having been placed in the market early 2013. The material for the next generation of optoelectronic devices will most likely be based on mixed dimensionality nanocrystals like CdSe/CdSe dot-in-rod (DRs) nanoheterostructures [1]. These nanoparticles consist of a spherical CdSe core and an elongated CdS shell resulting in a giant extinction coefficient below 450 nm [2]. Additionally, these DRs obtain a high photoluminescence quantum yield achieving values up to 80 %, show thermal- and photooxidation stability, as well as polarized emission of light [3].
In order to produce these systems in a reliable and robust way, we have developed a continuous seeded growth reactor as synthesis approach to manufacture tailor-made CdSe/CdS NCs for optoelectronic applications and for satisfying industrial demand regarding quality and quantity. This technique is based upon a two step synthesis and guarantees automation, reproducibility and a high degree of control over each step of nanoparticles’ growth. After purification of the obtained CdSe cores, these NCs are reintroduced into the reactor set-up. For the following shell synthesis, two different sections of the set-up are essential to mimic the classical hot-injection methodology guaranteeing high quality nanocrystals. On the one hand, a microfluidic mixing chamber which is heated individually to temperatures where nucleation takes place and on the other hand the growth oven, in which size and aspect ratio can be tailored by parameters like flow speed, precursor- and core- concentration.
Herein, we will present high quality DRs with various aspect ratios, the respective spectroscopic data and the set-up which is applied to synthesizing this material, as well as a model optoelectronic device showing their performance.
Literature:
[1] Rothenberg, E.; Kazes, M.; Shaviv, E. Banin, U. Nano Lett. 2005, 5, 8, 1581-1586.
[2] Talapin, D.V.; Koeppe, R.; Götzinger, S.; Kornowski, A.; Lupton, L. M.; Rogach, A. L.; Benson, O.; Feldmann, J.; Weller, H. Nano Lett. 2003, 3, 12, 1677-1681.
[3] Carbone, L.; Nobile, C.; De Giogi, M.; Della Sala, F.; Morello, G.; Pompa, P.; Hytch, M.; Snoeck, E.; Fiore, A.; Franchine, I. R.; Nadasan, M.; Silvestre A. F.; Chiodo, L.; Kudera, S.; Cingolani, R.; Krahne, R.; Manna, L. Nano Lett. 2007, 7, 10, 2942-2950.
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