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Red afterglow and luminescence arising from defects in CaS:Eu2+, Tm3+
https://uec.repo.nii.ac.jp/records/10057
https://uec.repo.nii.ac.jp/records/100573415aa9a-1581-462e-9868-ba85675c6570
名前 / ファイル | ライセンス | アクション |
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20210710foruecripositori.pdf (3.0 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2022-10-15 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Red afterglow and luminescence arising from defects in CaS:Eu2+, Tm3+ | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題 | luminescence | |||||
キーワード | ||||||
言語 | en | |||||
主題 | afterglow | |||||
キーワード | ||||||
言語 | en | |||||
主題 | phosphor | |||||
キーワード | ||||||
言語 | en | |||||
主題 | sulfide | |||||
キーワード | ||||||
言語 | en | |||||
主題 | europium | |||||
キーワード | ||||||
言語 | en | |||||
主題 | time-resolved fluorescence | |||||
キーワード | ||||||
言語 | en | |||||
主題 | defect | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Suda, Yoriko
× Suda, Yoriko× Tamura, Yuki× Yamaguchi, Syota× Nanai, Yasushi× Okuno, Tsuyoshi |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | CaS:Eu^2+, Tm^3+ is a phosphor known to emit a long afterglow of red emission (650 nm) when excited by blue light (450 nm). It shows a long afterglow time of 700 s for Eu = 0.05% and Tm = 2%. The mechanism of this afterglow is investigated using time-resolved fluorescence (TR-F) spectroscopy from the nanosecond to millisecond region. At room temperature, it is not possible to investigate shallow levels because of the effects of thermal vibrations. The mechanism of the emission characteristics at room temperature would be affected by these levels that can be observed only at low temperatures. Therefore, the samples are cooled to 15 K for the TR-F measurements. The host material CaS emits blue light (420 nm) arising from sulfur defects, and the typical decay time is measured to be 6 ms. This blue emission becomes stronger when Tm^3+ is doped. Furthermore, the doped Eu ions emit a broad red spectrum at 650 nm originating from the Eu^2+ -specific 4f^6 5d^1 –4f^7 transition. When the excitation is ceased, the red emission decays with a fast time constant of 0.6 μs. This value is a typical decay time for Eu^2+. This red emission has multiple decay time constants, and a component with a decay time of 6 ms appears. This 6 ms decay time is the same as that of the blue emission from the sulfur defects, which have an important role on the red afterglow. | |||||
書誌情報 |
en : Journal of Physics D: Applied Physics 巻 54, 号 41, p. 415103, 発行日 2021-10-14 |
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出版者 | ||||||
出版者 | IOP Publishing | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00223727 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1088/1361-6463/ac13f6 | |||||
権利 | ||||||
権利情報 | (c) 2021 IOP Publishing | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1088/1361-6463/ac13f6 | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa |