New-generation nanocrystals reveal their emission properties
Since their first synthesis in 2015 by Kovalenko’s group at ETH Zürich, the all-inorganic lead halide perovskite nanocrystals CsPbX3 (X = Br, Cl, I) have attracted great attention due to their outstanding electronic and optical properties, as well as their performances which outclass the ones of II-VI semiconductor counterparts in many application fields (single photon emitters, LED, bio-imaging …).
The members of Phocos group, in collaboration with the team Physuf of INSP and Quantum Optics Group at LKB, have focused their efforts on the emission properties at the single object scale in CSPbBr3. Supported by substantial theoretical developments, our experimental results evidence (i) the correlation between the excitonic fine structure (number of emission components, polarization states) and the crystalline structure of a single nanocrystal, (ii) the essential role played by the electron-hole exchange coupling on the splitting of the excitonic energies, and (iii) the mechanisms of the exciton-phonon interaction and their influence on emission. Our studies are very useful in nanophotonics as far as the optimization of coupling of such emitters to nanofibers and fibered nanocavities is concerned.
References
- “Fine structure of excitons and electron-hole exchange energy in polymorphic CsPbBr3single nanocrystals” Julien Ramade, Léon Marcel Andriambariarijaona, Violette Steinmetz, Nicolas Goubet, Laurent Legrand, Thierry Barisien, Frédérick Bernardot, Christophe Testelin, Emmanuel Lhuillier, Alberto Bramati, Maria Chamarro Nanoscale, 10, 6393-6401 (2018).
- “Exciton-phonon coupling in a CsPbBr3 single nanocrystal”
Julien Ramade, Léon Marcel Andriambariarijaona, Violette Steinmetz, Nicolas Goubet, Laurent Legrand, Thierry Barisien, Frédérick Bernardot, Christophe Testelin, Emmanuel Lhuillier, Alberto Bramati, Maria Chamarro Appl. Phys. Lett., 112, 072104 (2018).
Laurent Legrand : legrand(at)insp.jussieu.fr, Thierry Barisien : barisien(at)insp.jussieu.fr
