ARC Centre of Excellence for Nanoscale BioPhotonics, School of Science, RMIT University, Melbourne, VIC 3001, Australia.
Nanoscale. 2017 Jul 13;9(27):9299-9304. doi: 10.1039/c7nr02093g.
The nitrogen-vacancy (NV) centre in diamond is a unique optical defect that is used in many applications today and methods to enhance its fluorescence brightness are highly sought after. We observed experimentally an enhancement of the NV quantum yield by up to 7% in bulk diamond caused by an external magnetic field relative to the field-free case. This observation is rationalised phenomenologically in terms of a magnetic field dependence of the NV excited state triplet-to-singlet transition rate. The theoretical model is in good qualitative agreement with the experimental results at low excitation intensities. Our results significantly contribute to our fundamental understanding of the photophysical properties of the NV defect in diamond.
钻石中的氮空位（NV）中心是一种独特的光学缺陷，目前已应用于许多领域，提高其荧光亮度的方法备受关注。我们实验观察到，相对于无磁场情况，外磁场使体钻石中的 NV 量子产率提高了 7%。这一现象可以用 NV 激发态三重态到单重态的跃迁速率随磁场变化来加以解释。该理论模型在低激发强度下与实验结果定性相符。我们的研究结果对深入理解钻石中 NV 缺陷的光物理性质具有重要意义。
