在TbF3-化CaF2晶体中的Tb3+离子的光谱特性
Irinuca Bodea1, Marius Stef1, Carla Schornig1
1Department of Physics, West University of Timisoara, Bd. Vasile Parvan 4, 200223 Timisoara, Romania.
Materials (Basel, Switzerland)
|February 27, 2026
概括
用添加化 (CaF2:Tb3+) 单晶显示了光子设备有前途的绿色光辐射. 它们的光学特性,包括发光和量子效率,受到度的影响.
科学领域:
- 材料科学 材料科学 材料科学
- 光子学 是一个光子学.
- 发光的光度是非常的低.
背景情况:
- 基化 (CaF:Tb3+) 单晶是绿色光子应用的吸引力,因为它们的低声子能量,高光学透明度和高效的Tb3+发射.
- 了解化宿主中的Tb3+离子的度依赖的光谱行为对于优化材料性能至关重要.
研究的目的:
- 为了研究CaF2单晶的光谱特性,用不同度的TbF3 (1,5,和10mol%) 进行了注.
- 为了澄清Tb3+离子的度依赖性行为及其适用于光子应用的适用性.
主要方法:
- 单晶CaF2的生长与不同的TbF3度合.
- 光学吸收光谱学,贾德-奥菲尔特分析,静态和时间分辨率光发光度测量.
- 颜值测量评估,排放截面和增强参数计算.
主要成果:
- 获得了Judd-Ofelt参数,允许计算辐射过渡概率和寿命.
- 从5D4 → 7F5过渡观察到强烈的绿色发光,5D3发射被交叉放松抑制.
- 量子效率随着度的增加而增加,而光寿命仍然在毫秒范围内.
- 通过CIE 1931色系坐标确认了稳定的绿色辐射,最高的色辐射截面为10 mol% TbF.
结论:
- 单晶的CaF2:Tb3+表现出度依赖的光谱特性.
- 这些材料显示出绿色光子应用的潜力,因为它们的高效发光和可调节的发射特性.
相关概念视频
02:58Crystal Field Theory - Octahedral Complexes
31.3K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.3K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
49.0K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
49.0K
02:42Valence Bond Theory
11.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.4K
01:29UV–Vis Spectroscopy: Woodward–Fieser Rules
28.8K
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...
28.8K
03:02Colors and Magnetism
14.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.3K
01:29Atomic Fluorescence Spectroscopy
1.0K
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
1.0K