Defect-assisted photoluminescence in hexagonal boron nitride nanosheets
2D Materials, ISSN: 2053-1583, Vol: 7, Issue: 4
2020
- 19Citations
- 34Captures
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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
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85091110814&origin=inward; http://dx.doi.org/10.1088/2053-1583/ababf0; https://iopscience.iop.org/article/10.1088/2053-1583/ababf0; https://iopscience.iop.org/article/10.1088/2053-1583/ababf0/pdf; https://dx.doi.org/10.1088/2053-1583/ababf0; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=011b6119-c6c1-423c-9fa1-c3cbbe8f43d4&ssb=67675235566&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F2053-1583%2Fababf0&ssi=2c70544b-8427-451a-93fa-7dc4dc492fa9&ssk=support@shieldsquare.com&ssm=6801467863292446114231217620783254&ssn=b7510e8d9b9937a220e764da21d95a43b1a126eb7ea8-e29d-404c-95e05e&sso=0f0aea66-a15afdd7a834d1d1d0a6efc92b5976e1e1b9078aa4994773&ssp=43072769651717250018171730277100938&ssq=25974061345391825529737783717360061715962&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJfX3V6bWYiOiI3ZjYwMDBjN2RkNzg0MS1iZGI0LTQ1YTAtYjUxMi1mMzYxZjc2NzQ4ZmIxNzE3MjM3NzgzNTMyNzU2Njk3MjEtNTI5YzVkYjY4ZjNmZWI2MjE0MjMiLCJ1em14IjoiN2Y5MDAwMTI4NTY2YWEtZTNkOC00ODdkLWFiYzgtNWE4OWJjZDYyMzdhMi0xNzE3MjM3NzgzNTMyNzU2Njk3MjEtMGVjNjQwZjRhNmVhZjQ5YjE0MjMiLCJyZCI6ImlvcC5vcmcifQ==
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