Pressure-controlled luminescence in fast-response barium fluoride crystals
Abstract Cross-luminescence (CL) in a barium fluoride (BaF2) scintillator arising from the recombination of a valence band electron and a core band hole results in a fast picosecond decay time. However, the CL emission wavelength in the vacuum ultraviolet region is difficult to detect, and intrinsic...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-10-01
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| Series: | NPG Asia Materials |
| Online Access: | https://doi.org/10.1038/s41427-024-00570-8 |
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| author | Marilou Cadatal-Raduban Luong Viet Mui Masahiro Yamashita Yuki Shibazaki Toshihiko Shimizu Nobuhiko Sarukura Kohei Yamanoi |
| author_facet | Marilou Cadatal-Raduban Luong Viet Mui Masahiro Yamashita Yuki Shibazaki Toshihiko Shimizu Nobuhiko Sarukura Kohei Yamanoi |
| author_sort | Marilou Cadatal-Raduban |
| collection | DOAJ |
| description | Abstract Cross-luminescence (CL) in a barium fluoride (BaF2) scintillator arising from the recombination of a valence band electron and a core band hole results in a fast picosecond decay time. However, the CL emission wavelength in the vacuum ultraviolet region is difficult to detect, and intrinsically intense and slow nanosecond self-trapped exciton (STE) luminescence occurs. Herein, we report a redshift in the CL emission wavelength with high-pressure application. The wavelength of the CL emission shifted from 221 nm to 240 nm when 5.0 GPa was applied via a sapphire anvil cell. Increasing the pressure decreases the core-valence bandgap due to the downward expansion of the valence band, resulting in a decrease in the valence band minimum. The onset of a phase transition from a cubic crystal structure to an orthorhombic crystal structure at 3.7 GPa inhibited the recombination of conduction band electrons and self-trapped holes, leading to the disappearance of the STE emission. Manipulating the band structure of BaF2 by high-pressure application enables control of its luminescence emission, providing a pathway toward solving the problems inherent in this leading fast-response scintillator. |
| format | Article |
| id | doaj-art-c0230c35dbdf4e58a6f248a91a03e0dc |
| institution | Kabale University |
| issn | 1884-4057 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | NPG Asia Materials |
| spelling | doaj-art-c0230c35dbdf4e58a6f248a91a03e0dc2025-01-19T12:28:49ZengNature PortfolioNPG Asia Materials1884-40572024-10-0116111210.1038/s41427-024-00570-8Pressure-controlled luminescence in fast-response barium fluoride crystalsMarilou Cadatal-Raduban0Luong Viet Mui1Masahiro Yamashita2Yuki Shibazaki3Toshihiko Shimizu4Nobuhiko Sarukura5Kohei Yamanoi6Unitec Institute of TechnologyGraduate School of Engineering, Osaka UniversityInstitute of Laser Engineering, Osaka UniversityInstitute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)Institute of Laser Engineering, Osaka UniversityInstitute of Laser Engineering, Osaka UniversityInstitute of Laser Engineering, Osaka UniversityAbstract Cross-luminescence (CL) in a barium fluoride (BaF2) scintillator arising from the recombination of a valence band electron and a core band hole results in a fast picosecond decay time. However, the CL emission wavelength in the vacuum ultraviolet region is difficult to detect, and intrinsically intense and slow nanosecond self-trapped exciton (STE) luminescence occurs. Herein, we report a redshift in the CL emission wavelength with high-pressure application. The wavelength of the CL emission shifted from 221 nm to 240 nm when 5.0 GPa was applied via a sapphire anvil cell. Increasing the pressure decreases the core-valence bandgap due to the downward expansion of the valence band, resulting in a decrease in the valence band minimum. The onset of a phase transition from a cubic crystal structure to an orthorhombic crystal structure at 3.7 GPa inhibited the recombination of conduction band electrons and self-trapped holes, leading to the disappearance of the STE emission. Manipulating the band structure of BaF2 by high-pressure application enables control of its luminescence emission, providing a pathway toward solving the problems inherent in this leading fast-response scintillator.https://doi.org/10.1038/s41427-024-00570-8 |
| spellingShingle | Marilou Cadatal-Raduban Luong Viet Mui Masahiro Yamashita Yuki Shibazaki Toshihiko Shimizu Nobuhiko Sarukura Kohei Yamanoi Pressure-controlled luminescence in fast-response barium fluoride crystals NPG Asia Materials |
| title | Pressure-controlled luminescence in fast-response barium fluoride crystals |
| title_full | Pressure-controlled luminescence in fast-response barium fluoride crystals |
| title_fullStr | Pressure-controlled luminescence in fast-response barium fluoride crystals |
| title_full_unstemmed | Pressure-controlled luminescence in fast-response barium fluoride crystals |
| title_short | Pressure-controlled luminescence in fast-response barium fluoride crystals |
| title_sort | pressure controlled luminescence in fast response barium fluoride crystals |
| url | https://doi.org/10.1038/s41427-024-00570-8 |
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