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Article Dans Une Revue Angewandte Chemie International Edition Année : 2023

Gallium Sulfide Quantum Dots with Zinc Sulfide and Alumina Shells Showing Efficient Deep Blue Emission

Résumé

Abstract Solution‐processed quantum dot (QD) based blue emitters are of paramount importance in the field of optoelectronics. Despite large research efforts, examples of efficient deep blue/near UV‐emitting QDs remain rare due to lack of luminescent wide band gap materials and high defect densities in the existing ones. Here, we introduce a novel type of QDs based on heavy metal free gallium sulfide (Ga 2 S 3 ) and their core/shell heterostructures Ga 2 S 3 /ZnS as well as Ga 2 S 3 /ZnS/Al 2 O 3 . The photoluminescence (PL) properties of core Ga 2 S 3 QDs exhibit various decay pathways due to intrinsic defects, resulting in a broad overall PL spectrum. We show that the overgrowth of the Ga 2 S 3 core QDs with a ZnS shell results in the suppression of the intrinsic defect‐mediated states leading to efficient deep‐blue emission at 400 nm. Passivation of the core/shell structure with amorphous alumina yields a further enhancement of the PL quantum yield approaching 50 % and leads to an excellent optical and colloidal stability. Finally, we develop a strategy for the aqueous phase transfer of the obtained QDs retaining 80 % of the initial fluorescence intensity.
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hal-04289571 , version 1 (16-11-2023)

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Avijit Saha, Ranjana Yadav, Dmitry Aldakov, Peter Reiss. Gallium Sulfide Quantum Dots with Zinc Sulfide and Alumina Shells Showing Efficient Deep Blue Emission. Angewandte Chemie International Edition, 2023, 62 (45), ⟨10.1002/anie.202311317⟩. ⟨hal-04289571⟩
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