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Mario, Lorenzo Di
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Topics
Publications (4/4 displayed)
- 2024Understanding the Surface Chemistry of SnO2 Nanoparticles for High Performance and Stable Organic Solar Cellscitations
- 2023Tuning the energy transfer in Ruddlesden-Popper perovskites phases through isopropylammonium addition - towards efficient blue emitterscitations
- 2021Crystallization driven boost in fill factor and stability in additive-free organic solar cellscitations
- 2020Ultrafast optical spectroscopy of semiconducting and plasmonic nanostructures and their hybridscitations
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article
Tuning the energy transfer in Ruddlesden-Popper perovskites phases through isopropylammonium addition - towards efficient blue emitters
Abstract
<p>Here we demonstrate blue LEDs with a peak wavelength of 481 nm, with outstanding colour purity of up to 88% (CIE coordinates (0.1092, 0.1738)), an external quantum yield of 5.2% and a luminance of 8260 cd m<sup>−2</sup>. These devices are based on quasi-2D PEA<sub>2</sub>(Cs<sub>0.75</sub>MA<sub>0.25</sub>)Pb<sub>2</sub>Br<sub>7</sub>, which is cast from solutions containing isopropylammonium (iPAm). iPAm as additive assist in supressing the formation of bulk-like phases, as pointed out by both photophysical and structural characterization. Additionally, the study of the excitation dynamics demonstrates a hindering of the energy transfer to domains of lower energy that generally undermines the performance and emission characteristics of blue-emitting LEDs based on quasi-2D perovskites. The achieved narrow distribution of quantum well sizes and the hindered energy transfer result in a thin film photoluminescence quantum yield exceeding 60%. Our work demonstrates the great potential to tailor the composition and the structure of thin films based on Ruddlesden-Popper phases to boost performance of optoelectronic devices - specifically blue perovskite LEDs.</p>