Germanium: a new catalyst for diamond synthesis and a new optically active impurity in diamond.
Germanium: a new catalyst for diamond synthesis and a new optically active impurity in diamond.
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DOI：
10.1038/srep14789
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发表时间：
2015-10-05
影响因子：
4.6
通讯作者：
Surovtsev NV
中科院分区：
文献类型：
--
作者：
Palyanov YN;Kupriyanov IN;Borzdov YM;Surovtsev NV
金刚石作为一种用途广泛、技术上有用的材料，吸引了相当多的关注。对于许多要求苛刻的应用，例如最近出现的量子光学和传感，重要的是开发新的路线来制造具有特定光学、电子和磁性的含缺陷金刚石。在这里，我们报告了在7 GPa和1，500 - 1，800 °C的条件下从锗-碳系统成功合成金刚石。在反应时间达60 h的实验中，金刚石晶体和金刚石籽晶上的金刚石生长层均自发成核。我们发现在Ge-C系统中合成的金刚石含有一个新的光学中心，其ZPL系统位于2.059 eV处，这被归因于锗杂质。即使在室温下，该中心的光致发光也由零声子光学跃迁主导。我们的研究结果拓宽了金刚石合成的非金属元素催化剂的家族，并证明了金刚石中与锗相关的光学中心的产生。
Diamond attracts considerable attention as a versatile and technologically useful material. For many demanding applications, such as recently emerged quantum optics and sensing, it is important to develop new routes for fabrication of diamond containing defects with specific optical, electronic and magnetic properties. Here we report on successful synthesis of diamond from a germanium-carbon system at conditions of 7 GPa and 1,500–1,800 °C. Both spontaneously nucleated diamond crystals and diamond growth layers on seeds were produced in experiments with reaction time up to 60 h. We found that diamonds synthesized in the Ge-C system contain a new optical centre with a ZPL system at 2.059 eV, which is assigned to germanium impurities. Photoluminescence from this centre is dominated by zero-phonon optical transitions even at room temperature. Our results have widened the family of non-metallic elemental catalysts for diamond synthesis and demonstrated the creation of germanium-related optical centres in diamond.