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Subject of the postdoc

Quantum dot emissive layer for near infrared light emission

Financed post-doctoral position.
Published on 21 January 2022
Context
Imaging in the infrared wavelength range has been essential in scientific, military and surveillance applications. Currently, it is a crucial enabler of new industries such as autonomous mobility, augmented reality and biometrics. In a variety of imaging sensors an IR illumination system is required, for example in LiDAR and Face ID applications based on Time-Of-Flight. Colloidal semiconductor quantum dots (QDs) combine several advantageous features to realize such near infrared (NIR) sources: their emission spectrum can be precisely adjusted with size and composition, their emission efficiency and photostability can be enhanced by growing a shell of a larger bandgap semiconductor on their surface (core/shell QDs), and they can be produced and processed using solution-based low-cost and scalable techniques.

Environment
The project will be realized in collaboration with an industrial partner at the SyMMES unit of the Interdisciplinary Research Institute of Grenoble (IRIG), part of CEA Grenoble. State-of-the-art equipment or realizing all tasks of the project are available within the lab and at the nano-characterization platform PFNC (MINATEC). The applicant will evolve in a multidisciplinary environment and interact with the chemists and physicists of IRIG, as well as with our industrial partner. 

Subject
Currently electroluminescent devices made from QD thin films suffer from low efficiency (EQE <20%) and limited stability. They are using close-packed assemblies of QDs, which are prone to Förster resonance energy transfer (FRET) between smaller and larger sized QDs. The goal of this project will be to develop an emissive layer (EML) consisting of a high-mobility matrix, in which QDs can be dispersed while controlling the interparticle distance to decrease the FRET probability. The obtained EML will be characterized by means of AFM, SEM, UV-vis-NIR and PL spectroscopy, EDX, XPS, and mobility measurements. NIR-emitting QDs will be available ready for use.
 
Candidate’s profile
The candidate must hold a Ph.D. in chemistry, materials science or physics and have a strong background in physical chemistry of nanoparticles and/or processing and characterization of hybrid/composite materials for optoelectronics. Knowledge and experience in several of the above-mentioned characterization techniques will be required. Experience in quantum dots processing and device integration will be considered as a strong asset. 

Candidature
send a CV, the contact details of two references and a letter of motivation to Peter Reiss.

Starting date
As soon as possible.