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Defect-assisted photoluminescence in hexagonal boron nitride nanosheets

2D Materials, ISSN: 2053-1583, Vol: 7, Issue: 4
2020
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Article Description

The development of functional optoelectronic applications based on hexagonal boron nitride nanosheets (h-BNNs) relies on controlling the structural defects. The fluorescent emission, in particular, has been observed to depend on vacancies and substitutional defects. In the present work, few-layer h-BNNs have been obtained by sonication-assisted liquid-phase exfoliation of their bulk counterpart. The as-prepared samples exhibit a weak fluorescent emission in the visible range, centred around 400 nm. Tailored defects have been introduced by oxidation in air at different temperatures. A significant increase in the fluorescent emission of the oxidated h-BNNs has been observed with maximum emissive intensity for the samples treated at 300 °C. A further increase in temperatures (>300 °C) determines a quenching of the fluorescence. We investigated, by means of detailed microscopic and spectroscopic analysis, the relationship between the optical properties and defects of h-BNNs. The investigation of the optical properties as a function of treatment temperature highlights the critical role of hydroxyl groups created by the oxidation process. Only h-BN exfoliated in water allows introducing OH groups with consequent enhancement of fluorescence emission. Quantum chemical calculations support the experimental findings.

Bibliographic Details

Junkai Ren; Luigi Stagi; Luca Malfatti; Plinio Innocenzi; Carlo Maria Carbonaro; Pier Carlo Ricci; Maria Francesca Casula; Antonio Esau Del Rio Castillo; Francesco Bonaccorso; Laura Calvillo; Gaetano Granozzi

IOP Publishing

Chemistry; Materials Science; Physics and Astronomy; Engineering

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