Delayed luminescence and thermoluminescence in laboratory-grown diamonds
| Autor: | Zhao, Jiahui, Green, Ben L., Breeze, Ben G., Yuan, Hengxin, Ardon, Troy, Wang, Wuyi, Newton, Mark E. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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. Comment: 11 pages, 9 figures |
| Databáze: | arXiv |
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