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...

中文翻译：

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六方氮化硼纳米片中的缺陷辅助光致发光

基于六方氮化硼纳米片（h -BNNs）的功能光电应用的开发依赖于控制结构缺陷。特别地，已经观察到荧光发射取决于空位和取代缺陷。在目前的工作中，通过声波辅助液相剥离其本体对应物已经获得了几层h -BNN。所制备的样品在可见光范围内以400 nm为中心呈现弱荧光发射。通过在不同温度下在空气中氧化已引入了量身定制的缺陷。对于在300°C处理的样品，在最大发射强度下，氧化的h-BNNs的荧光发射显着增加。温度的进一步升高（> 300°C）决定了荧光的猝灭。我们调查了