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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