Development of Nd-Doped CaWO<sub>4</sub> Single Crystalline Scintillators Emitting Near-Infrared Light
Nd-doped CaWO<sub>4</sub> single crystals with dopant concentrations of 0.1, 0.5, and 1% were synthesized by the floating zone method. The transmission, photoluminescence, and scintillation properties were evaluated from ultraviolet to near-infrared (NIR) ranges. An emission peak due to...
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MDPI AG
2022-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/22/11624 |
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| author | Kai Okazaki Daisuke Nakauchi Hiroyuki Fukushima Takumi Kato Noriaki Kawaguchi Takayuki Yanagida |
| author_facet | Kai Okazaki Daisuke Nakauchi Hiroyuki Fukushima Takumi Kato Noriaki Kawaguchi Takayuki Yanagida |
| author_sort | Kai Okazaki |
| collection | DOAJ |
| description | Nd-doped CaWO<sub>4</sub> single crystals with dopant concentrations of 0.1, 0.5, and 1% were synthesized by the floating zone method. The transmission, photoluminescence, and scintillation properties were evaluated from ultraviolet to near-infrared (NIR) ranges. An emission peak due to transitions of the host was observed at 400 nm, and several sharp peaks originating from Nd<sup>3+</sup> 4f–4f transitions were confirmed at 900, 1060, and 1300 nm. The quantum yields of 0.1, 0.5, and 1% Nd-doped samples were 70.7, 79.5, and 61.2%, respectively, when monitored, and excited wavelengths were 750–1500 nm and 590 nm. Decay times consistent with typical Nd<sup>3+</sup> transitions were obtained when NIR ranges were monitored. Additionally, the energy transfer between the host and Nd<sup>3+</sup> occurred according to the decay measurement. The relationship between X-ray irradiated dose rate and intensity in the range of NIR was investigated by combining the crystals with an InGaAs-photodiode. The lowest detectable dose rate retaining the linearity of the present crystals was 0.3–0.06 Gy/h. |
| first_indexed | 2024-03-09T18:29:11Z |
| format | Article |
| id | doaj.art-4a2f98e2206c4a06a61bb3f1f25c5a24 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T18:29:11Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-4a2f98e2206c4a06a61bb3f1f25c5a242023-11-24T07:38:17ZengMDPI AGApplied Sciences2076-34172022-11-0112221162410.3390/app122211624Development of Nd-Doped CaWO<sub>4</sub> Single Crystalline Scintillators Emitting Near-Infrared LightKai Okazaki0Daisuke Nakauchi1Hiroyuki Fukushima2Takumi Kato3Noriaki Kawaguchi4Takayuki Yanagida5Division of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-Cho, Ikoma City 630-0192, Nara, JapanDivision of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-Cho, Ikoma City 630-0192, Nara, JapanDivision of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-Cho, Ikoma City 630-0192, Nara, JapanDivision of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-Cho, Ikoma City 630-0192, Nara, JapanDivision of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-Cho, Ikoma City 630-0192, Nara, JapanDivision of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-Cho, Ikoma City 630-0192, Nara, JapanNd-doped CaWO<sub>4</sub> single crystals with dopant concentrations of 0.1, 0.5, and 1% were synthesized by the floating zone method. The transmission, photoluminescence, and scintillation properties were evaluated from ultraviolet to near-infrared (NIR) ranges. An emission peak due to transitions of the host was observed at 400 nm, and several sharp peaks originating from Nd<sup>3+</sup> 4f–4f transitions were confirmed at 900, 1060, and 1300 nm. The quantum yields of 0.1, 0.5, and 1% Nd-doped samples were 70.7, 79.5, and 61.2%, respectively, when monitored, and excited wavelengths were 750–1500 nm and 590 nm. Decay times consistent with typical Nd<sup>3+</sup> transitions were obtained when NIR ranges were monitored. Additionally, the energy transfer between the host and Nd<sup>3+</sup> occurred according to the decay measurement. The relationship between X-ray irradiated dose rate and intensity in the range of NIR was investigated by combining the crystals with an InGaAs-photodiode. The lowest detectable dose rate retaining the linearity of the present crystals was 0.3–0.06 Gy/h.https://www.mdpi.com/2076-3417/12/22/11624scintillationphotoluminescence4f–4f transitionfloating zone method |
| spellingShingle | Kai Okazaki Daisuke Nakauchi Hiroyuki Fukushima Takumi Kato Noriaki Kawaguchi Takayuki Yanagida Development of Nd-Doped CaWO<sub>4</sub> Single Crystalline Scintillators Emitting Near-Infrared Light Applied Sciences scintillation photoluminescence 4f–4f transition floating zone method |
| title | Development of Nd-Doped CaWO<sub>4</sub> Single Crystalline Scintillators Emitting Near-Infrared Light |
| title_full | Development of Nd-Doped CaWO<sub>4</sub> Single Crystalline Scintillators Emitting Near-Infrared Light |
| title_fullStr | Development of Nd-Doped CaWO<sub>4</sub> Single Crystalline Scintillators Emitting Near-Infrared Light |
| title_full_unstemmed | Development of Nd-Doped CaWO<sub>4</sub> Single Crystalline Scintillators Emitting Near-Infrared Light |
| title_short | Development of Nd-Doped CaWO<sub>4</sub> Single Crystalline Scintillators Emitting Near-Infrared Light |
| title_sort | development of nd doped cawo sub 4 sub single crystalline scintillators emitting near infrared light |
| topic | scintillation photoluminescence 4f–4f transition floating zone method |
| url | https://www.mdpi.com/2076-3417/12/22/11624 |
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