Fluorescence, Phosphorescence, Thermoluminescence and charge transfer in synthetic diamond

荧光和磷光是用于区分天然钻石和人造钻石的许多区分技术的基础，这些物理过程是许多基于钻石颜色中心的新光子和量子技术的核心。在高温高压合成金刚石中，观察到的磷光现象可以用施主-受主对复合来解释。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，有许多事情我们很难解释。磷光峰的位置没有被解释，发射和涉及氮施主的电荷转移之间没有确定的联系，以及其他缺陷在猝灭发光中的作用。此外，在通过化学气相沉积生长并随后处理(如高压高温退火法、辐照和退火法等)的钻石中。有无法解释的荧光和磷光。本项目将利用光致发光、磷光和热释光，结合缺陷和杂质含量的定量测量和理论，来研究人造金刚石中所涉及的缺陷和发光的潜在机制。

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.