Brightening of Dark Excitons in 2D Perovskites

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2021 Nov 10

PMID 34757785

Citations 12

Authors

Mateusz Dyksik

Herman Duim

Duncan K Maude

Michal Baranowski

Maria Antonietta Loi

Paulina Plochocka

Affiliations

Soon will be listed here.

Abstract

Optically inactive dark exciton states play an important role in light emission processes in semiconductors because they provide an efficient nonradiative recombination channel. Understanding the exciton fine structure in materials with potential applications in light-emitting devices is therefore critical. Here, we investigate the exciton fine structure in the family of two-dimensional (2D) perovskites (PEA)SnI, (PEA)PbI, and (PEA)PbBr. In-plane magnetic field mixes the bright and dark exciton states, brightening the otherwise optically inactive dark exciton. The bright-dark splitting increases with increasing exciton binding energy. Hot photoluminescence is observed, indicative of a non-Boltzmann distribution of the bright-dark exciton populations. We attribute this to the phonon bottleneck, which results from the weak exciton–acoustic phonon coupling in soft 2D perovskites. Hot photoluminescence is responsible for the strong emission observed in these materials, despite the substantial bright-dark exciton splitting.

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