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タイトル: | Band-gap variation and a self-redox effect induced by compositional deviation in ZnxGa2O3+x:Cr3+ persistent phosphors |
著者: | Zhuang, Yixi Ueda, Jumpei Tanabe, Setsuhisa https://orcid.org/0000-0002-7620-0119 (unconfirmed) Dorenbos, Pieter |
著者名の別形: | 庄, 逸熙 |
発行日: | 29-Apr-2014 |
誌名: | Journal of Materials Chemistry C |
巻: | 2 |
号: | 28 |
開始ページ: | 5502 |
終了ページ: | 5509 |
抄録: | We made a systematic investigation on the optical properties of non-doped and Cr-doped ZnxGa2O3+x (0.98 ≤ x ≤ 1.02) spinel crystals. Absorption, photoluminescence excitation, and persistent luminescence excitation spectra indicated that the bottom of conduction band (CB) was affected (i) by compositional deviation from stoichiometry or (ii) by atmosphere control in a similar way. By constructing an energy level diagram, a broad distribution of trap depth in a Cr3+-doped ZnxGa2O3+x sample with composition of Zn excess or in one prepared in O2 atmosphere was attributed to lowering of the CB bottom, which resulted in faster decay of persistent luminescence in these two samples. Defect chemical reactions revealed that the anti-sites species of Zn′Ga may be the reason for lowering of the CB bottom. A self-redox effect of Cr ions induced by the compositional deviation was found and explained by the defect reactions. The investigation indicated that the composition with slight Zn deficiency is important to obtain a narrow distribution of trap depths and longer persistent luminescence, however the self-reduction effect of Cr ions in the composition of Zn deficiency also need to be considered. |
記述: | Accepted 27 Apr 2014 |
著作権等: | This journal is © The Royal Society of Chemistry 2014. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/198760 |
DOI(出版社版): | 10.1039/c4tc00369a |
出現コレクション: | 学術雑誌掲載論文等 |
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