Donor-acceptor discrete optical emission in 2D perovskites
Guillermo Muñoz Matutano a, Marie Krecmarova a, Setatira Gorji a, Alejandro Molina a, María C. Asensio b c, Andrés F. Gualdrón-Reyes d e, Jesús Rodríguez-Romero d f, Hamid Pashaei-Adl a, Rodolfo Canet-Albiach a, Luca Schio g, Massimo Tormen g, Luca Floreano g, Iván Mora-Seró d, Juan Martínez Pastor a c, Juan Francisco Sánchez-Royo a c
a Instituto de Ciencia de Materiales Universidad de Valencia (ICMUV), Avinguda de Blasco Ibáñez, 13, València, Spain
b Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC 28049 Madrid, Spain, Sor Juana Inés de la Cruz, ICMM, 3, Madrid, Madrid, Spain
c MATIN ´ EE: CSIC Associated Unit (ICMM-ICMUV), Universidad de Valencia, Valencia, Spain
d Institute of Advanced Materials (INAM), Universitat Jaume I, Avenida de Vicent Sos Baynat, s/n, 12071, Castelló de la Plana, Spain
e Facultad de Ciencias, Instituto de Ciencias Químicas, Isla Teja, Universidad Austral de Chile, Valdivia, 5090000, Los Ríos, Chile, Valdivia, Chile
f Facultad de Quimica, Universidad Nacional Autónoma de México, Circuito Exterior, s/n, Ciudad de México, Mexico
g CNR-IOM, Laboratorio TASC, 34149 Trieste, Italy.
Proceedings of International Conference on Emerging Light Emitting Materials (EMLEM22)
Materials for next generation LEDs and lasers:
Limasol, Cyprus, 2022 October 3rd - 5th
Poster, Guillermo Muñoz Matutano, 065
Publication date: 15th July 2022

Twodimensional (2D) layered perovskite is widely studied Van der Waals material recently used for a huge range of applications in photonics and optoelectronics, especially due to its outstanding electrical and optical properties. In this work, we present solid experimental evidence for the presence of single donor-acceptor pair (DAP) optical transitions in 2D Lead Halide Perovskites with n=2 phase, characterized by sharp linewidths (≃ 120 μeV) and long decay times (5-8 ns). This Micro-photoluminescence evidence is supported with detailed Photoemission measurements, and a model simulation. Lead and methylamonium have been identified as the source of the DAP formation, corresponding to the displacement of lead atoms and their replacement by methylamonium. These discrete DAP sharp and bright optical transitions in 2D Lead Halide Perovskites discovered by us, will be further implemented as the carrier sources for novel designs of optoelectronic devices with 2D perovskites, and will foster the development of future outstanding properties in non-linear quantum technologies.

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