NIR-Emitting Colloidal Nanocrystals for Optoelectronic Applications: Production in a Continuous Flow Reactor

K. Poulsen, C. Gimmler, D. Ness, J. Niehaus, H. Weller
CAN GmbH, DE

Keywords: continuous flow production, lead sulfide nanoparticles, semiconductor nanocrystals, photovoltaics

Summary:

Herein we will present our continuous flow technology for the synthesis of spherical, monodisperse and highly luminescent PbS-quantum dots. The production of nanoparticles with an average FWHM (emission peak) of 115 nm (≙ 142 meV, compared to single particle line widths averages of 100 meV) can be achieved. Control over particle sizes and properties is done by variation of temperature, flow speed and precursor parameters. Working with a continuous flow system allows us to synthesize quantum dots from 3 to 8 nm with a high degree of reproducibility. In addition the particle dispersions show no reduction of fluorescence intensity during heat treatment.