Phonon-Bottleneck Enhanced Exciton Emission in 2D Perovskites
Artikel i vetenskaplig tidskrift, 2024
Layered halide perovskites exhibit remarkable optoelectronic properties and technological promise, driven by strongly bound excitons. The interplay of spin-orbit and exchange coupling creates a rich excitonic landscape, determining their optical signatures and exciton dynamics. Despite the dark excitonic ground state, surprisingly efficient emission from higher-energy bright states has puzzled the scientific community, sparking debates on relaxation mechanisms. Combining low-temperature magneto-optical measurements with sophisticated many-particle theory, the origin of the bright exciton emission in perovskites is elucidated by tracking the thermalization of dark and bright excitons under a magnetic field. The unexpectedly high emission is clearly attributed to a pronounced phonon-bottleneck effect, considerably slowing down the relaxation toward the energetically lowest dark states. It is demonstrated that this bottleneck can be tuned by manipulating the bright-dark energy splitting and optical phonon energies, offering valuable insights and strategies for controlling exciton emission in layered perovskite materials that is crucial for optoelectronics applications.
exciton dynamics
phonons
layered perovskite
excitons
Författare
J. J.P. Thompson
Philipps-Universität Marburg
University of Cambridge
Mateusz Dyksik
Politechnika Wrocławska
Paulina Peksa
LCMI Laboratoire des Champs Magnetiques Intenses
Politechnika Wrocławska
Katarzyna Posmyk
Politechnika Wrocławska
LCMI Laboratoire des Champs Magnetiques Intenses
Ambjörn Joki
Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik
Raul Perea Causin
Chalmers, Fysik, Kondenserad materie- och materialteori
Paul Erhart
Chalmers, Fysik, Kondenserad materie- och materialteori
M Baranowski
Politechnika Wrocławska
M. A. Loi
Rijksuniversiteit Groningen
Paulina Plochocka
LCMI Laboratoire des Champs Magnetiques Intenses
Politechnika Wrocławska
Ermin Malic
Philipps-Universität Marburg
Advanced Energy Materials
1614-6832 (ISSN) 1614-6840 (eISSN)
Vol. 14 20 2304343Ämneskategorier
Atom- och molekylfysik och optik
Den kondenserade materiens fysik
DOI
10.1002/aenm.202304343