École Thématique « Molecular Photochemistry »

L’école est organisée sur trois jours intensifs et comprendra des cours frontaux (environ 18 heures) ainsi que des exercices et des sessions de Questions & Réponses (environ 3 heures) dispensés par des intervenants locaux, nationaux et internationaux. Les cours seront présentés en anglais.

Liste des intervenants :

  • Pr. Vincent Robert (LCQ, Université de Strasbourg & CNRS)
  • Pr. Stefan Haacke (IPCMS-DON, Université de Strasbourg & CNRS)
  • Dr. Chantal Daniel (LCQ, Université de Strasbourg & CNRS)
  • Pr. Lorenzo Di Bari (Dept. of Chemistry, University of Pisa, Italie)
  • Pr. Ally Aukauloo (ICMMO, Université Paris-Saclay)
  • Dr. Pascal Didier (Faculté de Pharmacie, Université de Strasbourg & CNRS)
  • Pr. Federico Polo (DMSN, Ca’ Foscari University of Venice, Italie)
  • Dr. Giulio Ragazzon (ISIS, Université de Strasbourg & CNRS)
  • Dr. Alberto Barsella (IPCMS-DON, Université de Strasbourg & CNRS)
  • Dr. Loïc Mager (IPCMS-DON, Université de Strasbourg & CNRS)
  • Dr. Jérémie Léonard (IPCMS-DON, Université de Strasbourg & CNRS)
  • Dr. Matteo Mauro (IPCMS-DMO, Université de Strasbourg & CNRS)


Séminaire présenté par Clément Livache

Clément Livache

Nanotechnology and Advanced Spectroscopy Team

C-PCS, Chemistry Division

Los Alamos National Laboratory


Colloidal semiconductor nanocrystals, and in particular colloidal quantum dots, are solution-processable materials that combine the robustness and high quality of inorganic semiconductors with the ease of processability of organic materials. This makes them excellent candidates for new generations of optoelectronic devices including detectors, LED and laser sources.1 In the scope of their integration in such devices, spectroscopic approches are invaluable to understand fundamental photophysics, quantify relevant material parameters and drive synthesis optimization. In this talk, I will stress the importance of Auger decay control in nanocrystals. Auger recombination in high-quality nanocrystals is the principal non-radiative decay channel for multiexcitonic states. In Auger processes, an electron-hole pair (exciton) recombines by transfering its energy to a third carrier that get excited to higher energy levels.1 In lasing applications, Auger recombination is detrimental since it very efficiently destroys population inversion. I will demonstrate how ultrafast spectroscopy can be used to understand the fundamental parameters of Auger, and I will present two novel approaches for the control of Auger relaxation lifetime over 6 orders of magnitude. Introduction of spin-exchange interactions in doped systems allows for considerable Auger acceleration below 500 fs,2 leading to ultrafast electron photoemission with applications to photocathodes, photochemistry and potentially efficient solar cells beyond the Shockley-Queisser limit.2,3 On the over side of the spectrum, the development of new compositional-graded core-shell structures allows for a dramatic increase of Auger lifetime beyond 2 ns,4,5 opening the way to the integration of nanocrystals in the first prototypes of electrically-injected laser diodes.6,7 

[1] Pietryga, Klimov et al. Chem. Rev. 2016

[2] Livache et al. Nature Photonics 2022

[3] Jin, Livache et al. Nature Materials – just accepted

[4] Lim et al. Nature Nanotechnology 2018

[5] Livache et al. submitted

[6] Ahn, Livache et al. Advanced Materials 2023

[7] Ahn, Livache et al. Nature – just accepted

QMat Mini-Symposium

10:00 – 10:30: Valia Voliotis
Institut des Nano-Sciences de Paris (INSP), Sorbonne Université
Semiconductor quantum dots for applications in quantum photonics”

10:30 – 11:00: Ivan Favero
Matériaux et Phénomènes Quantiques (MPQ), Université Paris Cité et CNRS
Electro-optomechanical modulation instability in a semiconductor resonator

11:00 – 11:15: Coffee Break

11:15 – 11:45: Antoine Reserbat-Plantey
Université Côte d’Azur, CNRS, CRHEA, Sophia-Antipolis
Quantum nano-photonics with 2D crystals

11:45 – 12:15: Reiko Yamada
The Institute of Photonic Sciences (ICFO), Casteldefells, Espagne
Sounding quantum randomness, sonifying Wigner function

A updated flyer and the abstracts are available here: https://seafile.unistra.fr/f/a016eb43d87c4eeaad0a/