The annealing effects of Lu_0.8Sc_0.2BO₃:Pr³⁺ scintillation crystal within different atmospheres

详细信息	查看全文 | 推荐本文 |

• 作者：Yuntao Wu ; ^{caswyt@hotmail.com} ; Guohao Ren ; ^{rgh@mail.sic.ac.cn} ; Dongzhou Ding ; Fan Yang ; Shangke Pan
• 关键词：Scintillation crystal ; Lutetium scandium orthoborate ; Annealing effects ; Oxygen vacancies
• 刊名：Solid State Sciences
• 出版年：2012
• 期刊代码：98_12932558
• 类别：ch
• 出版时间：May, 2012
• 卷：14
• 期：5
• 页码：635-638
• 文件大小：861 K

摘要

The air-annealing effects on Lu_0.8Sc_0.2BO₃:Pr³⁺ crystals grown by Czochralski method (Cz-method) were studied at different temperatures. Its scintillation efficiency reached optimum of about 500%of BGO after annealing at 1000聽掳C due to the removal of the oxygen vacancies. However, after annealing at a higher temperature, it was found that its scintillation efficiency was evidently reduced, because of oxidization of praseodymium ions. Through experiments, results show for Pr³⁺-doped Lu_0.8Sc_0.2BO₃ scintillator, air-annealing plays either positive or negative role, depending on annealing temperature: low temperature annealing is favorable for the removal of oxygen vacancies, but annealing at high temperature causes oxidation of Pr from trivalent to tetravalent state, which are demonstrated by H₂ annealing experiment.