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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2407.11787 |
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| _version_ | 1866909257565208576 |
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| author | Zhao, Jiahui Green, Ben L. Breeze, Ben G. Yuan, Hengxin Ardon, Troy Wang, Wuyi Newton, Mark E. |
| author_facet | Zhao, Jiahui Green, Ben L. Breeze, Ben G. Yuan, Hengxin Ardon, Troy Wang, Wuyi Newton, Mark E. |
| contents | The blue-green phosphorescence/thermoluminescence is most commonly observed in diamonds following excitation at or above the indirect band gap and has been explained by a substitutional nitrogen-boron donor-acceptor pair recombination model. Orange and red phosphorescence have also been frequently observed in lab-grown near-colourless high-pressure high-temperature diamonds following optical excitation, and their luminescence mechanisms are shown to be different from that of the blue-green phosphorescence. The physics of the orange and red luminescence and phosphorescence bands including the optical-excitation dependency (UV-NIR), temperature dependency (20 - 573 K), and related charge transfer process are investigated by a combination of self-built time-resolved imaging/spectroscopic techniques. In this paper, an alternative model for long-lived phosphorescence based on charge trapping is proposed to explain the orange phosphorescence/ thermoluminescence band. Additionally, the red phosphorescence band are attributed to point defect which possibly has a three-level phosphorescence system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_11787 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Delayed luminescence and thermoluminescence in laboratory-grown diamonds Zhao, Jiahui Green, Ben L. Breeze, Ben G. Yuan, Hengxin Ardon, Troy Wang, Wuyi Newton, Mark E. Materials Science The blue-green phosphorescence/thermoluminescence is most commonly observed in diamonds following excitation at or above the indirect band gap and has been explained by a substitutional nitrogen-boron donor-acceptor pair recombination model. Orange and red phosphorescence have also been frequently observed in lab-grown near-colourless high-pressure high-temperature diamonds following optical excitation, and their luminescence mechanisms are shown to be different from that of the blue-green phosphorescence. The physics of the orange and red luminescence and phosphorescence bands including the optical-excitation dependency (UV-NIR), temperature dependency (20 - 573 K), and related charge transfer process are investigated by a combination of self-built time-resolved imaging/spectroscopic techniques. In this paper, an alternative model for long-lived phosphorescence based on charge trapping is proposed to explain the orange phosphorescence/ thermoluminescence band. Additionally, the red phosphorescence band are attributed to point defect which possibly has a three-level phosphorescence system. |
| title | Delayed luminescence and thermoluminescence in laboratory-grown diamonds |
| topic | Materials Science |
| url | https://arxiv.org/abs/2407.11787 |