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Structure, valence change, and optical properties of BaMgSiO4:Eu phosphor
Journal of Luminescence ( IF 3.6 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.jlumin.2020.117137
W.B. Dai , K. Huang , Y.M. Fan , H. Li , M. Xu

Abstract Optical properties of stuffed tridymite green color phosphor BaMgSiO4:Eu (BMSO:Eu) are systematic investigated in view of the structure, different synthetic atmosphere and ultraviolet (UV) stimulation. Three different Ba2+ sites are existed in equal amounts within the lattice, and considering the different ion radius between Ba2+, Mg2+, Si4+ and Eu2+/3+, dopants would be only replaced Ba2+ sites due to other sites are too small to accommodate the large Eu2+/3+. The assignments of emission bands to different Ba2+ sites are carried out according to the values of bond valence. BMSO:EuR synthesized under reducing atmosphere shows long-lasting phosphorescence (~1.2 h) while BMSO:EuA exhibits short phosphorescence (~5 min) calcined in air condition due to different concentrations of oxygen vacancies located in the vicinity of photogenerated Eu3+ cations. Photoionization of Eu2+ to Eu3+ in BMSO:EuR after UV irradiation is confirmed, and the photogenerated Eu3+ cannot change back spontaneously to Eu2+ at room temperature. The self-reduction of Eu3+ to Eu2+ is also observed for BMSO:EuA via a substitution defect model. Altogether, the green emission of BMSO:EuA and long afterglow of BMSO:EuR indicates that this kind of phosphors have numerous potential applications, such as in white light emitting diodes (wLEDs), bioimaging and other related fields.

中文翻译:

BaMgSiO4:Eu荧光粉的结构、价态变化和光学性质

摘要 针对填充鳞石英绿色荧光粉BaMgSiO4:Eu (BMSO:Eu) 的结构、不同合成气氛和紫外光刺激的光学性质进行了系统研究。晶格内等量存在三个不同的 Ba2+ 位点,考虑到 Ba2+、Mg2+、Si4+ 和 Eu2+/3+ 之间的离子半径不同,由于其他位点太小而无法容纳大的 Eu2+,掺杂剂只能替换 Ba2+ 位点/3+。不同Ba2+位点的发射带分配是根据键价的值进行的。在还原气氛下合成的 BMSO:EuR 显示出持久的磷光(~1.2 小时),而 BMSO:由于位于光生 Eu3+ 阳离子附近的氧空位浓度不同,EuA 在空气条件下显示出短磷光(~5 分钟)。确认紫外线照射后 BMSO:EuR 中 Eu2+ 光电离为 Eu3+,并且光生的 Eu3+ 在室温下不能自发变回 Eu2+。BMSO:EuA 通过替代缺陷模型也观察到 Eu3+ 自我还原为 Eu2+。总之,BMSO:EuA 的绿色发射和 BMSO:EuR 的长余辉表明这种荧光粉具有许多潜在的应用,例如在白光发光二极管 (wLED)、生物成像和其他相关领域。BMSO:EuA 通过替代缺陷模型也观察到 Eu3+ 自我还原为 Eu2+。总之,BMSO:EuA 的绿色发射和 BMSO:EuR 的长余辉表明这种荧光粉具有许多潜在的应用,例如在白光发光二极管 (wLED)、生物成像和其他相关领域。BMSO:EuA 通过替代缺陷模型也观察到 Eu3+ 自我还原为 Eu2+。总之,BMSO:EuA 的绿色发射和 BMSO:EuR 的长余辉表明这种荧光粉具有许多潜在的应用,例如在白光发光二极管 (wLED)、生物成像和其他相关领域。
更新日期:2020-06-01
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