Spectroscopic study and visible luminescence of Tb3+ ions in CaF2 crystal co-activated with Yb3+

IF 3.8 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Anastasiya V. Nekhoroshikh, Vasily A. Konyushkin, Petr G. Zverev
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引用次数: 0

Abstract

High quality crystals with composition of Ca0.95Tb0.05F2.05 and Ca0.85Tb0.05Yb0.1F2.15 were grown by Bridgman-Stockbarger technique. Yb3+ ions were used as a sensitizer for Tb3+ ions. Optical properties were measured, including the absorption spectrum, emission spectrum, and fluorescence decay curves. Judd-Ofelt theory was used to analyze the spectroscopic parameters. Fluorescence branch ratio, transition probability, radiative and fluorescence lifetimes, and quantum efficiency were determined. The emission cross section of Tb3+ ions in Tb:CaF2 and Tb/Yb:CaF2 crystals for the green emission at 544 nm, corresponding to the transitions of 5D47F5 were calculated to be 4.61 × 10−22 cm2 and 4.60 × 10−22 cm2, respectively. Our experiments have shown that doping with Yb3+ ions does not significantly affect the spectral properties of Tb3+ ions in CaF2 crystal. Quadratic dependence of the emission intensity of Tb3+ ion in Tb/Yb:CaF2 crystal on the intensity of a diode laser at 955 nm proved that the excitation of Tb3+ ion occurs due to the cooperative process of transferring the excitation from two Yb3+ ions to one neighboring Tb3+ ion. The Tb/Yb:CaF2 crystal can be considered as a promising up-converting medium for creating diode-pumped visible phosphorus and active laser media.
与Yb3+共活化的CaF2晶体中Tb3+离子的光谱研究及可见发光
采用Bridgman-Stockbarger技术生长出Ca0.95Tb0.05F2.05和Ca0.85Tb0.05Yb0.1F2.15组成的高质量晶体。用Yb3+离子作为Tb3+离子的增敏剂。测量了其光学性能,包括吸收光谱、发射光谱和荧光衰减曲线。采用Judd-Ofelt理论对光谱参数进行了分析。测定了荧光分支比、跃迁概率、辐射寿命和荧光寿命以及量子效率。计算出Tb:CaF2和Tb/Yb:CaF2晶体中Tb3+离子在544 nm处的绿色发射截面,对应5D4→7F5的跃迁分别为4.61 × 10−22 cm2和4.60 × 10−22 cm2。我们的实验表明,掺杂Yb3+离子对CaF2晶体中Tb3+离子的光谱性质没有显著影响。Tb3+离子在Tb/Yb:CaF2晶体中的发射强度与955 nm二极管激光强度的二次依赖关系证明了Tb3+离子的激发是由两个Yb3+离子向相邻的Tb3+离子转移的协同过程引起的。Tb/Yb:CaF2晶体可以被认为是一种有前途的上转换介质,用于制造二极管泵浦可见磷和主动激光介质。
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来源期刊
Optical Materials
Optical Materials 工程技术-材料科学:综合
CiteScore
6.60
自引率
12.80%
发文量
1265
审稿时长
38 days
期刊介绍: Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.
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