Fluorescence, Phosphorescence, Thermoluminescence and charge transfer in synthetic diamond

荧光和磷光是许多用于分离天然钻石和合成钻石的鉴别技术的基础，这些物理过程是许多基于钻石色心的新光子和量子技术的核心。在HPHT合成金刚石中观察到的磷光解释在施主-受主对复合方面。这无疑是正确的，电子对中性硼受体的热激活表明硼起着关键作用。然而，有一些事情我们很难解释。磷光峰的位置没有得到解释，没有决定性的联系之间的发射和电荷转移涉及的氮供体，和其他缺陷的作用，在淬灭发光。此外，在通过化学气相沉积生长并随后处理（例如，高压高温退火、辐照和退火等）的金刚石中，有无法解释的荧光和磷光。本计画将利用光致发光、磷光及热释光，结合缺陷及杂质含量之定量量测与理论，探讨人造钻石中所涉及之缺陷及发光之潜在机制。

Fluorescence and Phosphorescence underpin many of the discrimination techniques use to separate natural from synthetic diamond and these physical processes are at the heart of many new photonic and quantum technologies based on colour centres in diamond. In HPHT synthetic diamond the phosphorescence observed is explained in terms of donor-acceptor pair recombination. This is undoubtedly correct, and the thermal activation of electrons to neutral boron acceptors shows that boron plays a key role. However, there are a number of things that we struggle to explain. The phosphorescence peak positions are not explained, there is no conclusive link between the emission and charge transfer involving the nitrogen donor, and the role of other defects in quenching the luminescence. Furthermore, in diamonds grown by chemical vapour deposition, and subsequently treated (e.g. high pressure high temperature annealing, irradiated and annealed, etc.) there is unexplained fluorescence and phosphorescence. This project will use photoluminescence, phosphorescence and thermoluminescence, allied with quantitative measurements of defect and impurity content and theory, to investigate the defects involved and the underlying mechanisms of luminescence in synthetic diamond.