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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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Pau, Riccardo
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2024Photophysics and optoelectronics of metal halide perovskites and other unconventional semiconductors
- 2024Dynamic Disorder in Monolayer and Multilayer 2D Ruddlesden–Popper Lead Iodide Perovskites: Evidence from Solid-State Nuclear Magnetic Resonance and Ultrafast Optical Spectroscopy
- 2023Exciton dissociation in 2D layered metal-halide perovskitescitations
- 2023Air- and water-stable and photocatalytically active germanium-based 2D perovskites by organic spacer engineeringcitations
- 2023Air- and water-stable and photocatalytically active germanium-based 2D perovskites by organic spacer engineeringcitations
- 2022White light emission with unity efficiency from Cs 2 Na 1−x Ag x In 1−y Bi y Cl 6 double perovskites:the role of bismuth and silvercitations
- 2022Direct measurement of radiative decay rates in metal halide perovskites†citations
- 2022White light emission with unity efficiency from Cs2Na1−xAgxIn1−yBiyCl6 double perovskitescitations
- 2022Direct measurement of radiative decay rates in metal halide perovskitescitations
- 2021A new photophysics for 2D and 3D lead halide perovskites: Polaron plasma in equilibrium with bright excitons
- 2017Self-Assembled Lead Halide Perovskite Nanocrystals in a Perovskite Matrixcitations
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article
White light emission with unity efficiency from Cs2Na1−xAgxIn1−yBiyCl6 double perovskites
Abstract
<p>Double perovskites Cs<sub>2</sub>Na<sub>1−x</sub>Ag<sub>x</sub>In<sub>1−y</sub>Bi<sub>y</sub>Cl<sub>6</sub> can emit warm white light with almost unity quantum efficiency and are thus among the most promising materials for solid-state lighting. The emission spectrum is reproducible and the materials themselves are robust against degradation, as well as fabricated from earth-abundant, non-toxic precursors. The emission efficiency is however sensitive to the materials composition, with small variations modifying the photoluminescence quantum yield by more than an order of magnitude. We provide here a comprehensive, systematic study of the optical properties as a function of composition and identify the microscopic mechanism linking the presence of Bi and Ag to the high emission quantum yield. A 0.1% minimum fraction of Bi and Ag is found to trigger efficient emission of warm white light. Ag alloying is fundamental to obtain high emission yields. Continuous-wave spectroscopy measurements are complemented with ab initio computation of the electronic band structure in demonstrating that Bi strengthens optical absorption at the band gap edge of the double perovskites. In addition, it is found by combining time-resolved photoluminescence and transient absorption spectroscopy that Ag and Bi promote the formation of bright (radiative) self-trapped excitons, while inhibiting exciton relaxation into long-lived dark states.</p>