Bulk Growth, Thermal, and Polarized Spectral Characters of Nd3+-Doped Ca3(BO3)2 Single Crystals

IF 1.5 4区 材料科学 Q3 Chemistry
Pingzhang Yu, Hongwei Qi, Yanqing Liu, Fapeng Yu, Zhengping Wang, Yangyang Dang
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Abstract

The growth, ion concentrations, powder X-ray diffraction, thermal properties, and optical spectroscopy of Nd3⁺-doped Ca₃(BO₃)₂ single crystals are investigated. The Nd3+-doped Ca₃(BO₃)₂ single crystals with 1.97 at.% Nd3⁺ are successfully grown using the Czochralski (Cz) technique. To address the chemical valence imbalance between Nd3⁺ and Ca2⁺ in the Ca₃(BO₃)₂ crystals, the Na⁺ ions are introduced. The concentrations of Nd3⁺ and Na⁺ ions in the as-grown crystals are measured using inductively coupled plasma atomic emission spectroscopy (ICP-AES), yielding concentrations of 1.97 at% (N0 = 1.55 × 1020 cm−3), 1.94 at% (N0 = 1.52 × 1020 cm−3), respectively. The thermal behavior of the Nd3⁺-doped Ca3(BO3)2 crystals, including thermal expansion coefficients, specific heat, and thermogravimetric and differential thermal analysis (TG-DTA), is systematically investigated. At room temperature, the polarized absorption spectra, polarized fluorescence spectra, and fluorescence decay lifetimes are measured. Spectral parameters, including polarized absorption and stimulated emission cross-sections, intensity parameters, transition probabilities, radiative lifetime, and branching ratios are determined using the Judd-Ofelt (J-O) theory. The results indicate that Nd3+-doped Ca3(BO3)2 crystals are promising materials for near-infrared lasers, offering advantages such as rapid growth, large size, high specific heat, strong emission, and environmental stability.

Abstract Image

掺Nd3+ Ca3(BO3)2单晶的体生长、热及偏振光谱特性
研究了Nd3⁺掺杂Ca₃(BO₃)2单晶的生长、离子浓度、粉末x射线衍射、热性质和光谱学。Nd3+掺杂的Ca₃(BO₃)2单晶,1.97 at。使用Czochralski (Cz)技术成功地生长了% Nd3 +。为了解决Ca₃(BO₃)2晶体中Nd3 +和Ca2 +的化学价态失衡问题,我们引入了Na +。利用电感耦合等离子体原子发射光谱(ICP-AES)测量了生长晶体中Nd3 +和Na +离子的浓度,得到的浓度分别为1.97 at% (N0 = 1.55 × 1020 cm−3)和1.94 at% (N0 = 1.52 × 1020 cm−3)。系统地研究了Nd3 +掺杂Ca3(BO3)2晶体的热行为,包括热膨胀系数、比热、热重和差热分析(TG-DTA)。在室温下,测量了极化吸收光谱、极化荧光光谱和荧光衰减寿命。光谱参数,包括偏振吸收和受激发射截面、强度参数、跃迁概率、辐射寿命和分支比,使用Judd-Ofelt (J-O)理论确定。结果表明,掺Nd3+的Ca3(BO3)2晶体具有生长快、尺寸大、比热高、发射强、环境稳定性好等优点,是制备近红外激光器的理想材料。
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来源期刊
CiteScore
2.50
自引率
6.70%
发文量
121
审稿时长
1.9 months
期刊介绍: The journal Crystal Research and Technology is a pure online Journal (since 2012). Crystal Research and Technology is an international journal examining all aspects of research within experimental, industrial, and theoretical crystallography. The journal covers the relevant aspects of -crystal growth techniques and phenomena (including bulk growth, thin films) -modern crystalline materials (e.g. smart materials, nanocrystals, quasicrystals, liquid crystals) -industrial crystallisation -application of crystals in materials science, electronics, data storage, and optics -experimental, simulation and theoretical studies of the structural properties of crystals -crystallographic computing
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