2021 Fiscal Year Final Research Report
Correlation between intrinsic luminescence from self-trapped excitons and two-dimensionality or modulation of structure in oxoanion crystals and fabrication of high-energy photon conversion crystals
| Project/Area Number |
19K05052
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26040:Structural materials and functional materials-related
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| Research Institution | Akita University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
河野 直樹 秋田大学, 理工学研究科, 講師 (60800886)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 自己束縛励起子 / 低次元性物質 / 構造変調 / 高エネルギー光 / 波長変換 / オキソアニオン化合物 / ホウ酸塩 / アルミン酸ケイ酸塩 |
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| Outline of Final Research Achievements |
(1)We observed material-dependent intrinsic luminescence from self-trapped excitons (STEs) in nine orthoborates with BO33－ groups : layered or pseudo-layered ScBO3, YSc(BO3)2, LuSc(BO3)2, (LaSc3(BO3)4, and Ba3Y(BO3)3 crystals and nonlayered Sr3Y2(BO3)4, Ca4LaO(BO3)3, Ca4YO(BO3)3, and Sr6YSc(BO3)6 crystals.The intrinsic luminescence intensity from STEs was found to be strongly correlated with the two-dimensionality of the crystal structure. In BaCaBe2(BO3)2F2and BaMgBe2(BO3)2F2 crystals the dependence of the STE intensity on Ca2+substitution can be also explained in terms of a two-dimensional effect.(2)We examined the correlation between the intrinsic luminescence intensity and the two-dimensionality and structure modulation in (Ca1-xSrx)2Al2SiO7,(Ca1-xSrx)2MgSi2O7, and(Ca1-xNax)2(Mg1-2xAl2x)Si2O7 melilite crystals. The intense luminescence is considered to be due mainly to an incomensurate or comensurate structural modulation effect, or a two-dimensional effect.
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| Free Research Field |
固体光物性
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の学術的意義は、オキソアニオン(BO33-, PO43-, AlO45-, SiO44-)から成る層状や超構造(構造変調)複合イオン化合物について、EUV-VUVの広帯域の高エネルギー光によるホスト励起で、結晶のオキソアニオン層の2次元効果と構造変調に起因するアニオン由来の分子性自己束縛励起子の生成と発光強度の増強させるという新しい提案である。
本研究では、自己束縛励起子という物質固有の性質と構造次元性や変調に関する基礎的知見が得られ、機能材料開発に次元や変調制御という指導原理となり得る。得た知見から高エネルギー光の波長変換結晶創製とこれを利用した高エネルギー光検出器の開発に応用できる。
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