钻石中硼受主电荷转移引发磷光的直接证据  

Direct Evidence of Charge Transfer at Boron Acceptors Being Linked to Phosphorescence in Diamond

作　　者：李建军[1,2] 范澄兴 程佑法[1] 陈淑祥[4] 李桂华 田闵闵 

机构地区：[1]国家黄金钻石制品质量监督检验中心,山东济南250014 [2]山东省计量科学研究院山东省计量检测重点实验室,山东济南250014 [3]国家首饰质量监督检验中心深圳实验室,广东深圳518020 [4]齐鲁工业大学材料科学与工程学院,山东济南250353 [5]山东省社会公正计量行,山东济南250014

出　　处：《光谱学与光谱分析》2017年第6期1714-1717,共4页Spectroscopy and Spectral Analysis

基　　金：国家质量监督检验检疫总局科技发展计划项目(2012QK258)资助

摘　　要：受主元素硼与不带电荷的替位硼进行电荷重组会导致钻石发出磷光,但Ⅱb型钻石硼含量较高,难以为电荷重组与磷光的相关性提供直接证据。作者针对一粒在常光环境下近无色的钻石,利用DiamondViewTM的深紫外强光源照射样品,使之产生蓝绿色磷光,结合前人研究,推断该类型磷光与含硼元素有关。采集样品红外光谱,在磷光消退前,谱图呈现2 803cm^(-1)吸收峰,磷光消失后采集的红外谱图不显示2 803cm^(-1)峰。这一实验中受主硼在紫外光激发下失去电子,成为不带电荷的替位硼原子(B0),B0浓度升高超过红外光谱检测限,红外光谱识别到B0的存在,即引发2 803cm^(-1)吸收峰。处于激发态的电子返回基态与亚稳态的B0结合过程释放出光子产生磷光。该实验首次直接证实了硼受主与无电荷替位硼之间的电荷重组转移会引发钻石磷光。An almost colorless diamond observed under the condition of normal light was stimulated under deep ultraviolet light with the DiamondViewTM. It showed a vivid blue fluorescence and strong greenish blue phosphorescence. It indicated that the phosphorescent could last for a few seconds. The 2 803 cm-1absorption peaks of the infrared spectra only appear during the phosphorescence released. As the phosphorescence disappeared, this peak would be absent.Theorically speaking, the phosphorescence of diamond is related to charge transfer between the boron acceptor and a deep donor, changing the charge state of the boron from compensated to uncompensated and back again. But, too much boron contained in the Type IIb diamond and other defects would disturb to prove the direct correlations between the change in the boron charge state and the emission of phosphorescence. This experiment shows that the 2 803 cm-1 peak immediate data dependency on the phosphorescence gave the most direct evidence that the charge transfer at boron acceptors are foremost linked to phosphorescence in diamond. In essence, the boron acceptor would lose the electron being excited states with the DiamondViewTM and become the uncompensated boron to cause 2 803 cm-1 peak. As the end of excitation from the deep ultraviolet, the uncompensated boron atom of metastable state would throw the excited states electron away. During the excited electrons return to the ground state, the diamond will show luminance as phosphorescence. The wavelength of the emitted photon depends on the distance between the donor and the acceptor, among other factors, for the boron acceptor, common is 500 or/and 660 nm. In this experiment, the phosphorescence band is more likely in the center at 500 nm because of the bluish green phosphorescence. This phenomenon is the first one found as the proof of charging transfer at boron acceptors causing phosphorescence in diamond.

关 键 词：钻石 硼电荷转移 磷光 直接证据 

分 类 号：O434[机械工程—光学工程]