| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Richards, Bryce S.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (23/23 displayed)
- 2022Unclonable Anti-Counterfeiting Labels Based on Microlens Arrays and Luminescent Microparticlescitations
- 2021Solar Pumping of Fiber Lasers with Solid-State Luminescent Concentrators: Design Optimization by Ray Tracingcitations
- 2021Upscaling of perovskite solar modules: The synergy of fully evaporated layer fabrication and all‐laser‐scribed interconnections
- 2021Interface Pattern Engineering in Core-Shell Upconverting Nanocrystals: Shedding Light on Critical Parameters and Consequences for the Photoluminescence Properties
- 2021Exciton versus free carrier emission: Implications for photoluminescence efficiency and amplified spontaneous emission thresholds in quasi-2D and 3D perovskitescitations
- 2021Interface Pattern Engineering in Core‐Shell Upconverting Nanocrystals: Shedding Light on Critical Parameters and Consequences for the Photoluminescence Propertiescitations
- 2020Correction: Guest-responsive polaritons in a porous framework: chromophoric sponges in optical QED cavitiescitations
- 2020A fully planar solar pumped laser based on a luminescent solar collector
- 2020Inkjet‐Printed Micrometer‐Thick Perovskite Solar Cells with Large Columnar Grains
- 2020Guest-responsive polaritons in a porous framework: chromophoric sponges in optical QED cavitiescitations
- 2020Chemical vapor deposited polymer layer for efficient passivation of planar perovskite solar cellscitations
- 2019Continuous wave amplified spontaneous emission in phase-stable lead halide perovskitescitations
- 2019Vacuum‐Assisted Growth of Low‐Bandgap Thin Films (FA$_{0.8}$MA$_{0.2}$Sn$_{0.5}$Pb$_{0.5}$I$_{3}$) for All‐Perovskite Tandem Solar Cellscitations
- 2019Continuous wave amplified spontaneous emission in phase-stable triple cation lead halide perovskite thin filmscitations
- 2019Inkjet‐Printed Micrometer‐Thick Perovskite Solar Cells with Large Columnar Grainscitations
- 2018Inkjet-Printed Photoluminescent Patterns of Aggregation-Induced-Emission Chromophores on Surface-Anchored Metal–Organic Frameworkscitations
- 2018Reaction of porphyrin-based surface-anchored metal-organic frameworks to prolonged illumination
- 2018Reaction of porphyrin-based surface-anchored metal–organic frameworks caused by prolonged illumination
- 2017Triple cation mixed-halide perovskites for tunable lasers
- 2017Facile loading of thin-film surface-anchored metal-organic frameworks with Lewis-base guest moleculescitations
- 2017Facile loading of thin-film surface-anchored metal-organic frameworks with Lewis-base guest moleculescitations
- 2014Luminescent Polymer Films from Simple Processing of Coronene and Europium Precursors in Watercitations
- 2013Enhanced up-conversion for photovoltaics using 2D photonic crystalscitations
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article
Exciton versus free carrier emission: Implications for photoluminescence efficiency and amplified spontaneous emission thresholds in quasi-2D and 3D perovskites
Abstract
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. The increase of the volume fraction of thick quantum wells correlates with an increased contribution of free carrier recombination to the emission process of the quasi-2D materials. These results suggest that material development of quasi-2D materials for gain applications should target fast free charge carrier recombination rates by engineering the well thickness and size and not maximum photoluminescence quantum yields under low power excitation.