Lu Hsiao-Chi, Lin Meng-Yeh, Peng Yu-Chain, Lo Jen-Iu, Chou Sheng-Lung, Cheng Bing-Ming
National Synchrotron Radiation Research Center , No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
Anal Chem. 2014 Oct 21;86(20):10497-500. doi: 10.1021/ac503268q. Epub 2014 Oct 10.
Upon excitation at 170-240 nm, diamonds emit strong luminescence in wavelength range of 300-700 nm. The spectral features observed in the photoluminescence excitation (PLE) spectra show two vibrational progressions, A and B, related to nitrogen defects N2 and N4, respectively. We used PLE spectra excited in region 170-240 nm to identify the type of diamond and demonstrate quantitative analysis of the B center as a N4 nitrogen defect in diamonds; the least detectable concentration of the N4 nitrogen defect is about 13 ppb, and the sensitivity of PLE is about 30 times than that practicable with infrared absorption spectra.
在170 - 240纳米激发下，钻石在300 - 700纳米波长范围内发出强烈的发光。在光致发光激发（PLE）光谱中观察到的光谱特征显示出两个振动进展，A和B，分别与氮缺陷N2和N4相关。我们使用在170 - 240纳米区域激发的PLE光谱来识别钻石类型，并证明了作为钻石中N4氮缺陷的B中心的定量分析；N4氮缺陷的最低可检测浓度约为13 ppb，PLE的灵敏度比红外吸收光谱实际可行的灵敏度高约30倍。
