This work is devoted to the development of Visible and Near-Infrared Light Emitting Diodes and photodetectors based on colloidal nanocrystals. First, we report a wet strategy for solution processed QDLEDs. Using spin coated and inkjet printed polymers, we have developed our first devices. Unfortunately, their efficiencies were quite low. To overcome these issues, we have developed an original QDs deposition method based on stamping and Langmuir processes, called Langmuir-Schaeffer Stamping (LSS). LSS is a very cost-efficient, dry, simple and homogeneous method to deposit nanocrystals on any substrate, even on small molecules deposited layers. Using LSS, we have developed efficient devices whose specifications are reported here. Direct injection and Förster mechanisms are studied. Furthermore we have fabricated infrared devices with PbS nanocrystals. Performances of our 109 Jones NIR photo-detectors and NIR-QDLEDs are presented in this thesis.
