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BaAl₂O₄:Eu²⁺的发光动力学

Manash Kalita¹, J M Kalita²

¹Department of Physics, Cotton University, Guwahati, 781001, India.

Journal of fluorescence

|May 11, 2024

概括

在BaAl2O4中用欧进行注,产生新的蓝色和红色排放. 发光寿命显著增加,但由于能量传递机制,高度的Eu会导致火.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
发光的光度是非常的低的.

背景情况:

氧化和 (BaAl2O4) 是一种具有内在缺陷的宿主材料,导致蓝光发射.
稀土元素的兴奋剂,特别是欧 (Eu),是修改特性的一种常见策略.

研究的目的:

为了研究用欧洲添加的BaAl2O4的光发光特性.
了解欧胺度对辐射光谱和发光寿命的影响.
阐明负责发光动态和灭的基本机制.

主要方法:

采用了稳定状态和时间分辨率的光发光谱学.
不同度的欧 (1-5%) 被添加到BaAl2O4宿主中.
测量和分析了发射光谱和发光衰变时间.

主要成果:

没有使用过的BaAl2O4从F中心呈现出蓝色辐射 (~428nm).
欧欧兴奋剂引入了归属于Eu2+ (~485,518 nm) 和Eu3+ (~657 nm) 的新排放频段.
一个2%欧化样本显示异常发射 (~494nm),而在428nm的发光寿命增加了10^2的数量级.
蓝色发射强度灭超过3%的Eu doping,归因于二极四极相互作用和从Eu2+到F中心的非辐射能量转移.

结论:

欧兴奋剂有效地改变了BaAl2O4的发光,引入了新的发射颜色.
发光动力学是复杂的,涉及内部缺陷和外部剂离子之间的能量转移.
在Eu-doped BaAl2O4 中的度火是由二极四极相互作用和非辐射能量转移解释的.

关键词:

在BaAl2O4:Eu2+能源转移能源转移能源转移在F-中心.发光中心的发光中心.光发光 (PL) 是指光发光 (PL) 的时间.时间分辨率光发光 (TRPL)

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