DOI: https://doi.org/10.29363/nanoge.incnc.2021.037
Publication date: 8th June 2021
Hybrid metal lead halide quasi-2D (two-dimensional) perovskites are considered as innovative materials in photonic and photoelectronic applications thanks to their high photoluminescence yield and improved stability compared to the three-dimensional (3D) counterparts. Nevertheless, despite their outstanding emission properties, which indicate them as competitive active materials for light emitting devices, like LED and lasers, few works have been reported in literature on amplified spontaneous emission (ASE) in these materials.
In our work, we investigate the temperature dependence of photoluminescence (PL) and ASE in multilayered quasi-2D BA3MA3Pb5Br16 films in order provide a thorough understanding of the photophysics which distinguishes these innovative materials.
By analyzing the temperature-dependent PL spectra of the films, characterized by a mixture of wells with different thickness, and by comparing the PL spectra under high energy nanosecond pumping with standard spectra under weak excitation, we identified two temperature regimes, with different emission properties, which are ascribed to the coexistence of two crystalline phases (High Temperature - HT and Low Temperature-LT phases).
In particular, we demonstrated that the PL and ASE properties are strongly affected by the presence, above 190 K, of a minoritary fraction of the HT-phase, which dominates the PL spectra at low excitation density, while the emission of the LT phase dominates the PL spectra at high excitation density. We also observed that ASE is only present at low temperatures in the range between 13 K and 230 K, whereas at higher temperatures the ASE disappears, due to the competition between ASE and reabsorption from charge transfer states of the HT phase.
Our results provide a novel insight into the emission properties of quasi-2D lead bromide perovskites and are expected to be a guide for possible material improvement in order to exploit excellent emission properties of these quasi-2D materials for the realization of low threshold optically pumped lasers.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.