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Exciton versus free carrier emission: Implications for photoluminescence efficiency and amplified spontaneous emission thresholds in quasi-2D and 3D perovskites

Li, Yang; Allegro, Isabel ORCID iD icon; Kaiser, Milian; Malla, Aditya J.; Richards, Bryce S. ORCID iD icon; Lemmer, Uli; Paetzold, Ulrich W. ORCID iD icon; Howard, Ian A.


Among perovskite semiconductors, quasi-two-dimensional (2D) materials are attractive for the pursuit of electrically driven lasing given their excellent performance in light-emitting diodes (LEDs) and their recent success in continuous-wave optically pumped lasing. We investigate the spontaneous photoluminescence emission and amplified spontaneous emission (ASE) of a series of quasi-2D emitters, and their directly analogous 3D materials formed by removing the 2D organic spacer by annealing. Although the PL photoluminescence (PL) (at low optical excitation power) from quasi-2D films with high 2D spacer fractions can be much brighter than that from their 3D counterparts, the ASE thresholds of these quasi-2D materials tend to be higher. This counter-intuitive behavior is investigated through time-resolved photophysical studies, which reveal the emission in the high-spacer-content quasi-2D perovskite can be exclusively excitonic, and the exciton–exciton annihilation of quasi-2D perovskite starts to take over the exciton dynamics at a low exciton density (<10$^{16}$ cm$^{-3}$). To lower ASE thresholds in quasi-2D materials it is necessary to increase the volume fraction of thick quantum wells, which we achieve by decreasing the spacer content or by utilizing 1-naphthylmethylamine (NMA) linkers. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000134287
Veröffentlicht am 23.06.2021
DOI: 10.1016/j.mattod.2021.05.002
Zitationen: 8
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1369-7021, 1873-4103
KITopen-ID: 1000134287
HGF-Programm 38.01.04 (POF IV, LK 01) Modules, Stability, Performance and Specific Applications
Erschienen in Materials Today
Verlag Elsevier
Band 49
Seiten 35-47
Schlagwörter Quasi-2D perovskite; Light-emitting diodes; Amplified spontaneous emission; Exciton–exciton annihilation
Nachgewiesen in Dimensions
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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