| CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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Dependence of nitrogen vacancy color centers on nitrogen concentration in synthetic diamond |
| Yong Li(李勇)1,†, Xiaozhou Chen(陈孝洲)2, Maowu Ran(冉茂武)1, Yanchao She(佘彦超)1, Zhengguo Xiao(肖政国)1, Meihua Hu(胡美华)3, Ying Wang(王应)1, and Jun An(安军)1 |
1 Department of Physics and Electrical Engineering, Tongren University, Tongren 554300, China;
2 School of Mechanical Electronic and Information Engineering, China University of Mining and Technology, Beijing 100083, China;
3 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China |
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Abstract Crystallization of diamond with different nitrogen concentrations was carried out with a FeNiCo-C system at pressure of 6.5 GPa. As the nitrogen concentration in diamond increased, the color of the synthesized diamond crystals changed from colorless to yellow and finally to atrovirens (a dark green). All the Raman peaks for the obtained crystals were located at about 1330 cm-1 and contained only the sp3 hybrid diamond phase. Based on Fourier transform infrared results, the nitrogen concentration of the colorless diamond was < 1 ppm and absorption peaks corresponding to nitrogen impurities were not detected. However, the C-center nitrogen concentration of the atrovirens diamond reached 1030 ppm and the value of A-center nitrogen was approximately 180 ppm with a characteristic absorption peak at 1282 cm-1. Furthermore, neither the NV0 nor the NV- optical color center existed in diamond crystal with nitrogen impurities of less than 1 ppm by photoluminescence measurement. However, Ni-related centers located at 695 nm and 793.6 nm were observed in colorless diamond. The NE8 color center at 793.6 nm has more potential for application than the common NV centers. NV0 and NV- optical color centers coexist in diamond without any additives in the synthesis system. Importantly, only the NV- color center was noticed in diamond with a higher nitrogen concentration, which maximized optimization of the NV-/NV0 ratio in the diamond structure. This study has provided a new way to prepare diamond containing only NV- optical color centers.
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Received: 06 August 2021
Revised: 15 September 2021
Accepted manuscript online: 22 October 2021
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PACS:
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61.72.jn
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(Color centers)
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07.35.+k
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(High-pressure apparatus; shock tubes; diamond anvil cells)
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81.05.uj
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(Diamond/nanocarbon composites)
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81.10.-h
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(Methods of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12064038 and 52072113), the Natural Science Foundation of Guizhou Province Science and Technology Agency (Grant Nos. ZK[2021]019 and ZK[2021]031), the Outstanding Young Science and Technology Talents of Guizhou Pronice, China (Grant No.[2019]5673), and the Open Project of Inner Mongolia Key Lab of High-pressure Phase Functional Materials (Grant No. cfxygy202004). |
Corresponding Authors:
Yong Li
E-mail: likaiyong6@163.com
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Cite this article:
Yong Li(李勇), Xiaozhou Chen(陈孝洲), Maowu Ran(冉茂武), Yanchao She(佘彦超), Zhengguo Xiao(肖政国), Meihua Hu(胡美华), Ying Wang(王应), and Jun An(安军) Dependence of nitrogen vacancy color centers on nitrogen concentration in synthetic diamond 2022 Chin. Phys. B 31 046107
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