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Phase transition and fluorescence regulation of BaAl2Si2O8:Eu using Ba source
Journal of Luminescence ( IF 3.6 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.jlumin.2020.117058
Lanlan Sun , Qingling Wang , Xinxin Zhang , Zhijie Yang , Jing Cheng , Aierken Sidike , Jiuyang He

Abstract In this investigation, BaAl2Si2O8 (BAS):Eu2+ (BaF2-derived BAS:Eu and BaCO3-derived BAS:Eu) series of blue phosphor samples were synthesized through high-temperature solid-phase method, and their structure and luminescence properties were examined. In the case of BaF2-derived BAS:Eu, hexagonal feldspar (BaAl2Si2O8) was obtained, which exhibited a UV region (λem = 372 nm) fluorescence at 300 nm excitation. In the case of BaCO3-derived BAS:Eu, a monoclinic feldspar (BaAl2Si2O8) was obtained, which exhibited a blue region (λem = 428 nm) fluorescence at 300 nm excitation. The luminescence mechanism was the f-d transition of Eu2+, and the Eu2+ underwent different degrees of 5 d energy level splitting in different crystal field environments. This accounted for the UV region and blue region fluorescence. Considering that the phase transition between the hexagonal and monocline phases is a slow process, fluorescence emissions in UV and blue regions were generated during the two-phase transition period. As a result, phosphor exhibited a controllable spectrum from UV region (λem = 372 nm) to blue region (λem = 428 nm). Furthermore, based on the crystal field splitting formula, the blue-shift phenomenon of the spectrum was shown to occur in the monoclinic phase. Finally, the crystal distortion index of the environment of Eu2+ was calculated.

中文翻译:

BaAl2Si2O8:Eu 使用 Ba 源的相变和荧光调控

摘要 本研究采用高温固相法合成了 BaAl2Si2O8 (BAS):Eu2+ (BaF2 衍生的 BAS:Eu 和 BaCO3 衍生的 BAS:Eu) 系列蓝色荧光粉样品,并考察了它们的结构和发光性能。 . 在 BaF2 衍生的 BAS:Eu 的情况下,获得了六方长石 (BaAl2Si2O8),其在 300 nm 激发下表现出紫外区 (λem = 372 nm) 荧光。在 BaCO3 衍生的 BAS:Eu 的情况下,获得了单斜长石 (BaAl2Si2O8),在 300 nm 激发下显示蓝色区域 (λem = 428 nm) 荧光。发光机制是Eu2+的fd跃迁,Eu2+在不同的晶场环境中经历了不同程度的5d能级分裂。这说明了紫外线区域和蓝色区域荧光。考虑到六方相和单斜相之间的相变是一个缓慢的过程,在两相变期间产生了紫外和蓝色区域的荧光发射。结果,荧光粉表现出从紫外区(λem = 372 nm)到蓝色区(λem = 428 nm)的可控光谱。此外,根据晶体场分裂公式,光谱的蓝移现象显示发生在单斜晶相中。最后计算了Eu2+环境的晶体畸变指数。根据晶体场分裂公式,光谱的蓝移现象出现在单斜晶相中。最后计算了Eu2+环境的晶体畸变指数。根据晶体场分裂公式,光谱的蓝移现象出现在单斜晶相中。最后计算了Eu2+环境的晶体畸变指数。
更新日期:2020-06-01
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