Publication date: 30th May 2020
Recently, optical properties of boron nitride have been intensively studied. [1-3] However, bottom-up synthesis of fluorescent boron-nitride based dots is still a challenging task because a clear understanding of the synthesis-structure-properties relationship is far from a full understanding.[1] Other important issue is the incorporation of fluorescent dots into a solid-state matrix, which is necessary to develop future light-emitting devices.[2]
In the present work, a hydrothermal bottom-up method has been used to prepare fluorescent boron-oxygen-hydrogen-nitrogen dots (BONDs), which show two-colour fluorescence under different excitation wavelengths. A hybrid organic-inorganic film has been fabricated by sol-gel chemistry with the presence of BONDs in the precursors, where the optical properties are kept well.
References
[1] Luigi Stagi, Junkai Ren, and Plinio Innocenzi. From 2-D to 0-D boron nitride materials, the next challenge. Materials, 2019, 12, 3905.
[2] Junkai Ren, Luca Malfatti, Stefano Enzo, Carlo Maria Carbonaro, Laura Calvillo, Gaetano Granozzi, and Plinio Innocenzi. Boron oxynitride two-colour fluorescent dots and their incorporation in a hybrid organic-inorganic film. J. Colloid Interface Sci., 2020, 568, 398.
[3] Junkai Ren, Luigi Stagi, Carlo Maria Carbonaro, Luca Malfatti, Maria Francesca Casula, Pier Carlo Ricci, Antonio Del Rio, Francesco Bonaccorso, Laura Calvillo, Gaetano Granozzi, and Plinio Innocenzi. Defect-assisted photoluminescence in hexagonal boron nitride nanosheets. 2D Mater., 2020, DOI: 10.1088/2053-1583/ababf0.
Italian Ministry of Foreign Affairs and International Cooperation (MAECI) is acknowledged for funding through Cooperation Project "GINGSENG" (Grant PGR05249) between Italy and China. RAS and Fondazione di Sardegna are also acknowledged for funding through the project "Bando Fondazione di Sardegna-2016" and "L.R. 7/2007- 2016".
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