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1. 江西理工大学 材料与化学工程学院
2. 中国科学院 福建物质结构研究所
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Received:25 August 2008,
Revised:02 January 1900,
Published Online:30 April 2009,
Published:30 April 2009
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Influence of Yb<sup>3+</sup> Mole Fraction on Radiative Trapping of Yb∶GdAl<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub> Crystals[J]. Chinese journal of luminescence, 2009, 30(2): 167-173.
测量了一系列Yb
3+
摩尔分数(0.125…1)在Yb
3+
∶ GdAl
3
(BO
3
)
4
晶体(Yb ∶ GAB)的室温偏振吸收光谱、发射光谱。为了揭示和消除辐射陷阱对Yb
3+
光谱性质的影响
分别测量了块状、粉末和稀释粉末样品的发射光谱。为了比较不同摩尔分数和不同方式辐射陷阱的影响
采用倒易法(RM)和Fuchtbauer-Ladenburg公式(FL)来计算发射截面。实验结果表明:随着Yb
3+
离子摩尔分数的增加
辐射陷阱效应对发射光谱的影响越来越严重。在发射光谱中
随着Yb
3+
离子摩尔分数的增加
短波段发射变弱
长波段发射变强
因此
提出了Yb ∶ GAB 晶体中发射光谱的重心波长移动 Δ
λ
与 Yb
3+
离子摩尔分数之间的经验关系来定量分析Yb
3+
离子摩尔分数变化对辐射陷阱的影响;采用稀释法能够很好消除辐射陷阱对发射光谱的影响
而粉末法对于低Yb
3+
浓度的样品能够比较好地消除辐射陷阱的影响
块状样品直接测量很难消除辐射陷阱的影响。
paper
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