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Deep Red Photoluminescence from Cr 3+ in Fluorine-Doped Lithium Aluminate Host Material.

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Title: Deep Red Photoluminescence from Cr 3+ in Fluorine-Doped Lithium Aluminate Host Material.
Authors: Kamada, Yuki1 (AUTHOR), Hayasaka, Ryusei1 (AUTHOR), Uchida, Kento1 (AUTHOR), Suzuki, Taisei1 (AUTHOR), Takei, Takahiro2 (AUTHOR) takei@yamanashi.ac.jp, Kitaura, Mamoru3 (AUTHOR) kitaura@sci.kj.yamagata-u.ac.jp, Kominami, Hiroko4 (AUTHOR) kominami.hiroko@shizuoka.ac.jp, Hara, Kazuhiko5 (AUTHOR) hara.kazuhiko@shizuoka.ac.jp, Matsushima, Yuta1 (AUTHOR) ymatsush@yz.yamagata-u.ac.jp
Source: Materials (1996-1944). Jan2024, Vol. 17 Issue 2, p338. 15p.
Subjects: Electron paramagnetic resonance, Aluminates, Photoluminescence, Rietveld refinement, Lithium, Terbium
Abstract: 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 Cr3+ in this host material was demonstrated. Cr3+ 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 LiAl5O8 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 Al4.69Li1.31F0.28O7.55 at 1100 °C, Al4.73Li1.27F0.17O7.65 at 1200 °C, and Al4.83Li1.17F0.10O7.78 at 1300 °C. The Rietveld analysis revealed that ALFO and LiAl5O8 were isostructural with respect to the spinel-type lattice and in a disorder–order relationship in the arrangement of Li+ and Al3+. The emission peak of Cr3+ in LiAl5O8 resided at 716 nm, while Cr3+ 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 Cr3+ in ALFO was distorted, which was also supported by electron spin resonance spectra, suggesting that the local environment around Cr3+ 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. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Deep Red Photoluminescence from Cr 3+ in Fluorine-Doped Lithium Aluminate Host Material.
– Name: Author
  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Kamada%2C+Yuki%22">Kamada, Yuki</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hayasaka%2C+Ryusei%22">Hayasaka, Ryusei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Uchida%2C+Kento%22">Uchida, Kento</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Suzuki%2C+Taisei%22">Suzuki, Taisei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Takei%2C+Takahiro%22">Takei, Takahiro</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> takei@yamanashi.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Kitaura%2C+Mamoru%22">Kitaura, Mamoru</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> kitaura@sci.kj.yamagata-u.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Kominami%2C+Hiroko%22">Kominami, Hiroko</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> kominami.hiroko@shizuoka.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Hara%2C+Kazuhiko%22">Hara, Kazuhiko</searchLink><relatesTo>5</relatesTo> (AUTHOR)<i> hara.kazuhiko@shizuoka.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Matsushima%2C+Yuta%22">Matsushima, Yuta</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ymatsush@yz.yamagata-u.ac.jp</i>
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Jan2024, Vol. 17 Issue 2, p338. 15p.
– Name: Subject
  Label: Subjects
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  Data: <searchLink fieldCode="DE" term="%22Electron+paramagnetic+resonance%22">Electron paramagnetic resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminates%22">Aluminates</searchLink><br /><searchLink fieldCode="DE" term="%22Photoluminescence%22">Photoluminescence</searchLink><br /><searchLink fieldCode="DE" term="%22Rietveld+refinement%22">Rietveld refinement</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium%22">Lithium</searchLink><br /><searchLink fieldCode="DE" term="%22Terbium%22">Terbium</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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 Cr3+ in this host material was demonstrated. Cr3+ 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 LiAl5O8 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 Al4.69Li1.31F0.28O7.55 at 1100 °C, Al4.73Li1.27F0.17O7.65 at 1200 °C, and Al4.83Li1.17F0.10O7.78 at 1300 °C. The Rietveld analysis revealed that ALFO and LiAl5O8 were isostructural with respect to the spinel-type lattice and in a disorder–order relationship in the arrangement of Li+ and Al3+. The emission peak of Cr3+ in LiAl5O8 resided at 716 nm, while Cr3+ 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 Cr3+ in ALFO was distorted, which was also supported by electron spin resonance spectra, suggesting that the local environment around Cr3+ 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.3390/ma17020338
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 338
    Subjects:
      – SubjectFull: Electron paramagnetic resonance
        Type: general
      – SubjectFull: Aluminates
        Type: general
      – SubjectFull: Photoluminescence
        Type: general
      – SubjectFull: Rietveld refinement
        Type: general
      – SubjectFull: Lithium
        Type: general
      – SubjectFull: Terbium
        Type: general
    Titles:
      – TitleFull: Deep Red Photoluminescence from Cr 3+ in Fluorine-Doped Lithium Aluminate Host Material.
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              M: 01
              Text: Jan2024
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