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DTSTART:20250306T110000Z
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LOCATION:Seminar Room
SUMMARY:ICFO | VICTOR GUILLOUX 
CLASS:PUBLIC
DESCRIPTION:Over the past decade\, organic and inorganic lead halide perovs
 kite (LHP) nanocrystals (NCs) have emerged as a new class of colloidal qua
 ntum dots with great potential for a wide range of optoelectronic applicat
 ions\, including LEDs\, lasers\, and photodetectors [1\,2]. The exciton li
 es at the core of their optical properties and its fine structure&ndash\;w
 hich results from the exchange interaction between the electron and the ho
 le&ndash\;has been the subject of intense research\, motivated by the pote
 ntial use of these systems in quantum technologies as a platform for singl
 e-photon emission [3].\nThis work focuses on two LHP materials: CsPbCl3 an
 d FAPbBr3. In the case of CsPbCl3 NCs\, micro-PL spectroscopy experiments 
 are performed at cryogenic temperatures on single objects and reveal the b
 right states of the exciton fine structure (EFS)\, with energy splittings 
 influenced by an interplay of the crystal symmetry\, the dielectric enviro
 nment and the NC shape anisotropy [4] (see Figure 1). This work also highl
 ights the emission response of biexcitons and trions\, and explores the ro
 le of exciton-phonon interactions in the emission and coherence properties
 . Time-resolved PL spectroscopy further explores the emission dynamics wit
 h varying temperature\, revealing a two-phonon thermal mixing process betw
 een bright and dark excitonic states. This allows for the determination of
  the dark state energy position within the EFS [4]. FAPbBr3 NCs\, which ar
 e embedded in a mesoporous matrix without surface ligands [5]\, are first 
 investigated in low NC density samples to assess single-NC spectral respon
 ses. Samples of higher NC density are also examined and energy transfers b
 etween NCs are suggested by the emission dynamics. These results are compa
 red to numerical simulations of the PL dynamics based on FRET between near
 est neighbors allowing to obtain a first estimation of the transfer rate b
 etween ideally coupled NCs in this environment.
DTSTAMP:20260405T164240Z
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