2022 Fiscal Year Final Research Report
Study of chemical states of Eu luminescent centers of thiosilicate under photoirradiation
| Project/Area Number |
19K05492
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 34010:Inorganic/coordination chemistry-related
|
|---|
| Research Institution | The University of Electro-Communications |
|---|
Principal Investigator |
Kobayashi Yoshio 電気通信大学, 大学院情報理工学研究科, 教授 (30221245)
|
|---|
| Project Period (FY) |
2019-04-01 – 2023-03-31
|
| Keywords | フォトルミネセンス / バリウムチオシリケート / イメージングプレート / メスバウアー分光 / ユーロピウム / 光励起 |
|---|
| Outline of Final Research Achievements |
Fluorescent materials doped with rare earth elements such as europium (Eu), which are used in various light sources and liquid crystal displays, exhibit highly efficient visible light luminescence and have long-life emissions. In the fluorescent materials, it is considered that Eu(2+) replaces Ba(2+) to emit light through electronic transition between energy levels generated by impurities of Eu. 151Eu Mossbauer absorption spectra and quantum yield measurements revealed that Eu(2+) decreased and Eu(3+) increased due to charge transfer. In order to elucidate the electronic state of Eu before and after photo-irradiation, Mossbauer spectra used by CEMS and CXMS for internal conversion electrons and internal X-rays were measured.
|
| Free Research Field |
無機物理化学
|
| Academic Significance and Societal Importance of the Research Achievements |
EuやSm, Dy, Er, Ybなどの希土類元素をドープした数多くの蛍光材料は、光学遷移を利用した波長変換レーザや通信光増幅用ガラス、医療X線画像診断のイメージングなど広範に応用されている。発光中心にある元素ならびに周囲の化学状態や配位環境を調べることは、高い発光効率や残光現象の発現を解明する上で重要である。メスバウアー効果で放出する内部転換電子や内部転換X線を測定することで、原子スケールで発光現象の発現メカニズムを観察することができ、新しい蛍光発光材料の設計と開発に寄与する研究である。
|
