Phonon-Bottleneck Enhanced Exciton Emission in 2D Perovskites
Journal article, 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

Author

J. J.P. Thompson

Philipps University Marburg

University of Cambridge

Mateusz Dyksik

Wrocław University of Science and Technology

Paulina Peksa

LCMI Laboratoire des Champs Magnetiques Intenses

Wrocław University of Science and Technology

Katarzyna Posmyk

Wrocław University of Science and Technology

LCMI Laboratoire des Champs Magnetiques Intenses

Ambjörn Joki

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Raul Perea Causin

Chalmers, Physics, Condensed Matter and Materials Theory

Paul Erhart

Chalmers, Physics, Condensed Matter and Materials Theory

M Baranowski

Wrocław University of Science and Technology

M. A. Loi

University of Groningen

Paulina Plochocka

LCMI Laboratoire des Champs Magnetiques Intenses

Wrocław University of Science and Technology

Ermin Malic

Philipps University Marburg

Advanced Energy Materials

1614-6832 (ISSN) 1614-6840 (eISSN)

Vol. 14 20 2304343

Subject Categories

Atom and Molecular Physics and Optics

Condensed Matter Physics

DOI

10.1002/aenm.202304343

More information

Latest update

6/8/2024 4