Deep Red Photoluminescence from Cr<sup>3+</sup> in Fluorine-Doped Lithium Aluminate Host Material
Deep red phosphors have attracted much attention for their applications in lighting, medical diagnosis, health monitoring, agriculture, etc. A new phosphor host material based on fluorine-doped lithium aluminate (ALFO) was proposed and deep red emission from Cr<sup>3+</sup> in this host...
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| author | Yuki Kamada Ryusei Hayasaka Kento Uchida Taisei Suzuki Takahiro Takei Mamoru Kitaura Hiroko Kominami Kazuhiko Hara Yuta Matsushima |
| author_facet | Yuki Kamada Ryusei Hayasaka Kento Uchida Taisei Suzuki Takahiro Takei Mamoru Kitaura Hiroko Kominami Kazuhiko Hara Yuta Matsushima |
| author_sort | Yuki Kamada |
| collection | DOAJ |
| description | Deep red phosphors have attracted much attention for their applications in lighting, medical diagnosis, health monitoring, agriculture, etc. A new phosphor host material based on fluorine-doped lithium aluminate (ALFO) was proposed and deep red emission from Cr<sup>3+</sup> in this host material was demonstrated. Cr<sup>3+</sup> in ALFO was excited by blue (~410 nm) and green (~570 nm) rays and covered the deep red to near-infrared region from 650 nm to 900 nm with peaks around 700 nm. ALFO was a fluorine-doped form of the spinel-type compound LiAl<sub>5</sub>O<sub>8</sub> with slightly Li-richer compositions. The composition depended on the preparation conditions, and the contents of Li and F tended to decrease with preparation temperature, such as Al<sub>4.69</sub>Li<sub>1.31</sub>F<sub>0.28</sub>O<sub>7.55</sub> at 1100 °C, Al<sub>4.73</sub>Li<sub>1.27</sub>F<sub>0.17</sub>O<sub>7.65</sub> at 1200 °C, and Al<sub>4.83</sub>Li<sub>1.17</sub>F<sub>0.10</sub>O<sub>7.78</sub> at 1300 °C. The Rietveld analysis revealed that ALFO and LiAl<sub>5</sub>O<sub>8</sub> were isostructural with respect to the spinel-type lattice and in a disorder–order relationship in the arrangement of Li<sup>+</sup> and Al<sup>3+</sup>. The emission peak of Cr<sup>3+</sup> in LiAl<sub>5</sub>O<sub>8</sub> resided at 716 nm, while Cr<sup>3+</sup> in ALFO showed a rather broad doublet peak with the tops at 708 nm and 716 nm when prepared at 1200 °C. The broad emission peak indicated that the local environment around Cr<sup>3+</sup> in ALFO was distorted, which was also supported by electron spin resonance spectra, suggesting that the local environment around Cr<sup>3+</sup> in ALFO was more inhomogeneous than expected from the diffraction-based structural analysis. It was demonstrated that even a small amount of dopant (in this case fluorine) could affect the local environment around luminescent centers, and thus the luminescence properties. |
| first_indexed | 2024-03-08T10:42:58Z |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T10:42:58Z |
| publishDate | 2024-01-01 |
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| spelling | doaj.art-1bcf57f6bc104820b88788094b448c962024-01-26T17:26:46ZengMDPI AGMaterials1996-19442024-01-0117233810.3390/ma17020338Deep Red Photoluminescence from Cr<sup>3+</sup> in Fluorine-Doped Lithium Aluminate Host MaterialYuki Kamada0Ryusei Hayasaka1Kento Uchida2Taisei Suzuki3Takahiro Takei4Mamoru Kitaura5Hiroko Kominami6Kazuhiko Hara7Yuta Matsushima8Applied Chemistry, Chemical Engineering, and Biochemical Engineering, Yamagata University, Yonezawa 992-8510, JapanApplied Chemistry, Chemical Engineering, and Biochemical Engineering, Yamagata University, Yonezawa 992-8510, JapanApplied Chemistry, Chemical Engineering, and Biochemical Engineering, Yamagata University, Yonezawa 992-8510, JapanApplied Chemistry, Chemical Engineering, and Biochemical Engineering, Yamagata University, Yonezawa 992-8510, JapanCenter for Crystal Science and Technology, University of Yamanashi, Kofu 400-0021, JapanFaculty of Science, Yamagata University, Yamagata 990-8560, JapanFaculty of Engineering, Shizuoka University, Hamamatsu 432-8561, JapanResearch Institute of Electronics, Shizuoka University, Hamamatsu 432-8011, JapanApplied Chemistry, Chemical Engineering, and Biochemical Engineering, Yamagata University, Yonezawa 992-8510, JapanDeep red phosphors have attracted much attention for their applications in lighting, medical diagnosis, health monitoring, agriculture, etc. A new phosphor host material based on fluorine-doped lithium aluminate (ALFO) was proposed and deep red emission from Cr<sup>3+</sup> in this host material was demonstrated. Cr<sup>3+</sup> in ALFO was excited by blue (~410 nm) and green (~570 nm) rays and covered the deep red to near-infrared region from 650 nm to 900 nm with peaks around 700 nm. ALFO was a fluorine-doped form of the spinel-type compound LiAl<sub>5</sub>O<sub>8</sub> with slightly Li-richer compositions. The composition depended on the preparation conditions, and the contents of Li and F tended to decrease with preparation temperature, such as Al<sub>4.69</sub>Li<sub>1.31</sub>F<sub>0.28</sub>O<sub>7.55</sub> at 1100 °C, Al<sub>4.73</sub>Li<sub>1.27</sub>F<sub>0.17</sub>O<sub>7.65</sub> at 1200 °C, and Al<sub>4.83</sub>Li<sub>1.17</sub>F<sub>0.10</sub>O<sub>7.78</sub> at 1300 °C. The Rietveld analysis revealed that ALFO and LiAl<sub>5</sub>O<sub>8</sub> were isostructural with respect to the spinel-type lattice and in a disorder–order relationship in the arrangement of Li<sup>+</sup> and Al<sup>3+</sup>. The emission peak of Cr<sup>3+</sup> in LiAl<sub>5</sub>O<sub>8</sub> resided at 716 nm, while Cr<sup>3+</sup> in ALFO showed a rather broad doublet peak with the tops at 708 nm and 716 nm when prepared at 1200 °C. The broad emission peak indicated that the local environment around Cr<sup>3+</sup> in ALFO was distorted, which was also supported by electron spin resonance spectra, suggesting that the local environment around Cr<sup>3+</sup> in ALFO was more inhomogeneous than expected from the diffraction-based structural analysis. It was demonstrated that even a small amount of dopant (in this case fluorine) could affect the local environment around luminescent centers, and thus the luminescence properties.https://www.mdpi.com/1996-1944/17/2/338deep red phosphorfluorine-doped lithium aluminatespinel compounddisordered spinel3d transition metal ion |
| spellingShingle | Yuki Kamada Ryusei Hayasaka Kento Uchida Taisei Suzuki Takahiro Takei Mamoru Kitaura Hiroko Kominami Kazuhiko Hara Yuta Matsushima Deep Red Photoluminescence from Cr<sup>3+</sup> in Fluorine-Doped Lithium Aluminate Host Material Materials deep red phosphor fluorine-doped lithium aluminate spinel compound disordered spinel 3d transition metal ion |
| title | Deep Red Photoluminescence from Cr<sup>3+</sup> in Fluorine-Doped Lithium Aluminate Host Material |
| title_full | Deep Red Photoluminescence from Cr<sup>3+</sup> in Fluorine-Doped Lithium Aluminate Host Material |
| title_fullStr | Deep Red Photoluminescence from Cr<sup>3+</sup> in Fluorine-Doped Lithium Aluminate Host Material |
| title_full_unstemmed | Deep Red Photoluminescence from Cr<sup>3+</sup> in Fluorine-Doped Lithium Aluminate Host Material |
| title_short | Deep Red Photoluminescence from Cr<sup>3+</sup> in Fluorine-Doped Lithium Aluminate Host Material |
| title_sort | deep red photoluminescence from cr sup 3 sup in fluorine doped lithium aluminate host material |
| topic | deep red phosphor fluorine-doped lithium aluminate spinel compound disordered spinel 3d transition metal ion |
| url | https://www.mdpi.com/1996-1944/17/2/338 |
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