Publication date: 17th July 2025
Despite their relatively emerging degree of development, metal halide perovskite light-emitting diodes (PeLEDs) have reached outstanding brightness and radiative efficiency levels that roughly graze the maximum theoretical limits. Unfortunately, the complete understanding of their working principles and the photo-electrochemical mechanisms involved in the charge carrier injection/recombination dynamics are still a conundrum. Additionally, the strong ionic character of perovskites enables the migration of ions and the gradual formation of crystalline defects upon exposure to light and/or to an external electric field, which aggravates the complexity of these systems. In fact, these ionic processes are apparently coupled with those electrical involved in the generation of light and seem to be also connected with the widely reported limited long-term stability of the devices. Here, I will discuss the exploitation of a new methodology based on the combination of three frequency-domain modulated techniques, i.e. impedance spectroscopy (IS), voltage-modulated electroluminescence spectroscopy (VMELS) and current-modulated electroluminescence spectroscopy (CMELS), aimed at extracting values of characteristic thermodynamic constants and at reaching a full understanding of the PeLEDs technology. We propose a new theoretical model and an equivalent circuit that unifies these three techniques, which consider both the non-radiative and radiative contributions, as a powerful tool for the advanced characterization of any light-emitting device, being especially useful for the study of perovskite-based optoelectronic devices due to their inherent complexity. Particularly important is the deconvolution of the electrical, optical and ionic processes that are involved in the current-to-photon conversion, heat generation and/or degradation of the light-emitting material/device, as well as the elucidation of how all these phenomena mutually interact.
The authors are thankful for the financial support provided by the project RADIANT (Pathfinder Challenges Grant Agreement Identifier: 101162112), the Ministerio de Ciencia e Innovación of Spain (MICINN) and Agencia Estatal de Investigación AEI/10.13039/501100011033 by projects PID2019-107348GB-100 and STABLE PID2019-107314RB-I00, and the Generalitat Valenciana with Prometeo Q-Solutions project CIPROM/2021/078
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.