April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)
Symposium Supporters
2024 MRS Spring Meeting
QT03.05.09

Tunable White-Light Emission from Self-Trapped Excitons in Ultrathin Sheets of a Low-Dimensional Hybrid Perovskite

When and Where

Apr 24, 2024
5:00pm - 7:00pm
Flex Hall C, Level 2, Summit

Presenter(s)

Co-Author(s)

Philip Klement1,Natalie Dehnhardt2,Chuan-Ding Dong3,Florian Dobener1,Julius Winkler2,Samuel Bayliff4,Detlev Hofmann1,Peter Klar1,Stefan Schumacher3,Johanna Heine2,Sangam Chatterjee1

Justus Liebig University Giessen1,Philipps-Universität Marburg2,Paderborn University3,The University of Oklahoma4

Abstract

Philip Klement1,Natalie Dehnhardt2,Chuan-Ding Dong3,Florian Dobener1,Julius Winkler2,Samuel Bayliff4,Detlev Hofmann1,Peter Klar1,Stefan Schumacher3,Johanna Heine2,Sangam Chatterjee1

Justus Liebig University Giessen1,Philipps-Universität Marburg2,Paderborn University3,The University of Oklahoma4
Low-dimensional organic-inorganic perovskites complement the advantages of two classes of materials for next-generation optoelectronics: They combine customized building blocks for atomically thin, layered materials with the enhanced light-harvesting and -emitting capabilities of perovskites. These materials promise a playground for exploring novel phenomena driven by the dynamic interplay of electronic, photonic, and vibrational excitations.<br/> <br/>Traditionally, the prevailing belief has been that in-plane covalent interactions are an absolute prerequisite for forming atomically thin materials. This belief has, in turn, limited the range of candidates for 2D materials.<br/> <br/>In this study, we challenge this prevailing paradigm and present single layers of the one-dimensional organic-inorganic perovskite [C<sub>7</sub>H<sub>10</sub>N]<sub>3</sub>[BiCl<sub>5</sub>]Cl.<sup>[1]</sup> Its unique crystal structure facilitates the exfoliation of single layers and the formation of self-trapped excitons, resulting in tunable white-light emission. Remarkably, the thickness-dependent behavior of exciton self-trapping leads to an unprecedented photoluminescence shift of 0.4 eV between bulk crystals and ultrathin sheets.<br/> <br/>Our research demonstrates that even 1D covalent interactions suffice to create atomically thin materials, granting access to unique photophysics. These findings enable a versatile construction principle for identifying and creating two-dimensional materials, eliminating the prior constraint of covalently bonded 2D sheets.<br/><br/>[1] Klement, P.; Dehnhardt, N.; Dong, C.-D.; Dobener, F.; Bayliff, S.; Winkler, J.; Hofmann, D. M.; Klar, P. J.; Chatterjee, S.; Heine, J. (2021): Atomically Thin Sheets of Lead-Free 1D Hybrid Perovskites Feature Tunable White-Light Emission from Self-Trapped Excitons. <i>Adv. Mater.</i> <b>33</b>, 2100518, DOI: 10.1002/adma.202100518

Keywords

luminescence | perovskites

Symposium Organizers

Michal Baranowski, Wroclaw University of Science and Technology
Alexey Chernikov, Technische Universität Dresden
Paulina Plochocka, CNRS
Alexander Urban, LMU Munich

Symposium Support

Bronze
LIGHT CONVERSION
Wroclaw University of Science and Technology

Session Chairs

Alexey Chernikov
Yana Vaynzof

In this Session