金刚石荧光机制的研究及其对高压拉曼光谱测试的意义

刘云贵; 吕政星; 宋海鹏; 巫翔

doi:10.11858/gywlxb.20180689

金刚石荧光机制的研究及其对高压拉曼光谱测试的意义

doi: 10.11858/gywlxb.20180689

刘云贵^{1, 2,},
吕政星²,
宋海鹏²,
巫翔^2,*, ,

1.
河北地质大学宝石与材料工艺学院，河北石家庄　050031
2.
中国地质大学地质过程与矿产资源国家重点实验室，湖北武汉　430074

基金项目: 国家自然科学基金（41473056，41827802）

详细信息

作者简介:
刘云贵（1986－），男，硕士，讲师，主要从事高压矿物物理研究. E-mail: liuyungui@hgu.edu.cn

通讯作者:
巫　翔（1978－），男，博士，教授，主要从事地球深部物质的组成、状态和物性研究. E-mail: wuxiang@cug.edu.cn

中图分类号: O521.3
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出版历程
- 收稿日期: 2018-11-14
- 修回日期: 2018-12-05

Fluorescence Mechanism of Diamond and the Significance in High Pressure Raman Spectrometry

LIU Yungui^{1, 2
,},
LÜ Zhengxing²,
SONG Haipeng²,
WU Xiang^{2,*
, ,}

1.
College of Gems and Materials Technology, Hebei GEO University, Shijiazhuang 050031, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 基于金刚石压腔技术的高压拉曼散射光谱在高压科学的前沿研究中发挥重要作用，金刚石压砧的荧光效应影响测试样品的拉曼散射光谱信噪比。采用激光拉曼光谱仪，对202粒宝石级金刚石进行光致发光研究，确定了N3、H3和NV⁰中心等光学缺陷中心的存在，发现其浓度控制零声子线及荧光发射谱的强度，与金刚石荧光强度呈正相关。金刚石的二阶拉曼位移峰（约2664 cm^–1）两侧基线强度比值与荧光强度呈负相关，利用该比值可准确判断金刚石荧光的强弱。此外，金刚石中光学缺陷中心浓度的不均匀性普遍存在，多点测试综合分析能提供更全面的荧光信息。研究结果可为高压拉曼测试时金刚石压砧的选择提供有效的理论和实践依据。
- 金刚石荧光 /
- 金刚石压腔（DAC） /
- 二阶拉曼光谱 /
- 光学缺陷中心
Abstract: High pressure Raman scattering spectrometry which based on the diamond anvil cell technology plays an important role in the high pressure scientific research. The fluorescence of diamond anvil affects on the signal-to-noise ratio of Raman spectral for the sample in cell. The defect centers of 202 gem-grade diamonds have been confirmed by the photoluminescence spectra. The concentration of N3, H3 and NV⁰ defect centers controls the intensity of the zero-phonon line and the fluorescence emission spectrum, and it is positively correlated to the fluorescence intensity. While, the ratio of background intensity on the two sides of the diamond’s second-order Raman peak (about 2664 cm^–1) has a negative correlation with the fluorescence intensity, thus it could be used to estimate the fluorescence intensity of diamond. In addition, the inhomogeneous of the concentration of defect centers is common in diamond, and it will provide more comprehensive information by multipoint analysis. The results will provide effective theoretical and practical basis for the selection of diamond anvil in high pressure Raman spectra measurement.
- fluorescence of diamond /
- diamond anvil cell (DAC) /
- second-order Raman spectra /
- optical defect centers

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图 1 天然硬水铝石在2.2 GPa下的拉曼光谱(a)以及所用金刚石压砧的原位二阶拉曼光谱(b)和光致发光光谱(c)（采用两套金刚石压腔在相同实验条件下完成测试，硬水铝石产于土耳其，分子式为Al_0.98Cr_0.02OOH）

Figure 1. (a) Raman spectra of nature diaspore at 2.2 GPa, (b) the in-situ second-order Raman spectra and (c) photoluminescence spectra of diamond anvils (Two sets of diamond anvil cells were used to accomplish the measurements under the same experimental condition. The diaspore is from Turkey and its molecular formula is Al_0.98Cr_0.02OOH.)

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图 2 金刚石的二阶拉曼光谱及对应的I值：（a）不同金刚石随机测试点的I值；（b）ND-3不同测试点的I值；（c）ND-7不同测试点的I值

Figure 2. The second-order Raman spectra of diamond and the corresponding I value: (a) I value of different diamonds at a random point, (b) I value of ND-3 at different points, (c) I value of ND-7 at different points

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图 3 含N3缺陷中心金刚石随机测试点的光致发光光谱（a）及对应的原位二阶拉曼光谱（b）

Figure 3. Photoluminescence spectra (a) and the corresponding in-situ second-order Raman spectra (b) of diamonds with N3 defect centers at a random point

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图 4 室温和液氮温度下ND-3的光致发光光谱

Figure 4. Photoluminescence spectra of ND-3 at the room temperature and the liquid nitrogen temperature

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图 5 含H3缺陷中心金刚石随机测试点的光致发光光谱（a）及对应的原位二阶拉曼光谱（b）

Figure 5. Photoluminescence spectra (a) and the corresponding in-situ second-order Raman spectra (b) of diamonds with H3 defect centers at a random point

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图 6 含不同类型缺陷中心金刚石的红外光谱

Figure 6. IR spectra of diamonds with different types of defect centers

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图 7 金刚石缺陷中心及对应的荧光发射能量

Figure 7. A simplified model of the defect centers and their corresponding fluorescence emission energy in diamonds

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