2016 Fiscal Year Final Research Report
Formation of multiple self-trapped excitons in oxides with low dimensional photonic structures under extra UV excitation
| Project/Area Number |
26630301
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Inorganic materials/Physical properties
|
|---|
| Research Institution | Akita University |
|---|
Principal Investigator |
|
|---|
| Research Collaborator |
Takahashi Tomoko 秋田大学, 大学院理工学研究科技術部, 技術専門員
Kudo Mizuki 秋田大学, 大学院工学資源学研究科, 大学院生
Abe Akarii 秋田大学, 大学院工学資源学研究科, 大学院生
Sakashita Tomomi 秋田大学, 大学院工学資源学研究科, 大学院生
Kubota Hisanori 秋田大学, 大学院理工学研究科, 大学院生
|
|---|
| Project Period (FY) |
2014-04-01 – 2017-03-31
|
| Keywords | 真空紫外分光 / 自己束縛励起子 / 固有発光 / 量子カッティング / レーザーアブレーション |
|---|
| Outline of Final Research Achievements |
We found that there is a significant correlation between intrinsic emission bands from self-trapped excitons(STEs) upon extra UV excitation and the number of nonequivalent borate anion groups in some orthoborates.The number of emission bands coincides with the number of nonequivalent borate anion groups. Multiple STEs are produced from one absorbed photon when excited by photons with energies greater than or equal to twice the band gap energy.
We fabricated hole arrays in Li/Sr borate crystals and glasses with anion networks, and in a layered aluminosilicate by single-pulse femtosecond laser ablation toward realizing photonic crystals.We found morphological changes in borate crystals and glasses.The SEM images reveal the formation of circular holesin the borate glasses and aluminosilicate, whereas subwvelength tetragonal or polyhedral nanoholes were formed on the borate crystals.When using circular polarized pulse,the hole rotates about the beam axis upon linear polarized irradiation.
|
| Free Research Field |
光物性
|
