间层杂的Cs3Bi2Br9空位排序的矿中绑定间层激发的动态行为
Kyeongdeuk Moon1, Yang Ding2, Halyna Okrepka2
1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States.
ACS nano
|October 16, 2025
概括
在二维矿Cs3Bi2Br9中对银进行注,会产生结合层间激子 (BIE). 取决于温度的研究揭示了不同的排放模式和超快的动态,突出的是银.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 固态化学 固态化学
背景情况:
- 2D矿Cs3Bi2Br9 (CBB) 呈现出独特的电荷转移激发状态,称为绑定层间激发子 (BIE).
- 在CBB中使用银 (Ag+) 剂会在室温下产生明亮,长寿命的光发光 (PL),这表明在光电子和光催化学中的应用.
- 了解Ag-doped CBB (Ag-CBB) 中的激发载体动力学和辐射过程至关重要,但由组合测量所限制.
研究的目的:
- 使用先进的光谱技术研究Ag-CBB的温度依赖动态.
- 阐明银剂在控制BIEs和自我陷入刺激子 (STEs) 的形成和行为的作用.
- 了解控制光发射和载体放松的基本激发状态过程,在这个二维材料中.
主要方法:
- 单粒子时间解析光发光 (PL) 光谱在一系列温度范围内.
- 超快速的短暂吸收成像使用并行快速成像与光谱绘图 (PRISM).
- 在单个粒子水平上分析排放模式和载体动态.
主要成果:
- 确定了三种不同的排放模式:在高温下BIE主导,在中间温度下BIE和STE混合,以及在100K以下的STE主导.
- 在原始CBB中,PRISM揭示了亚皮秒级的STE形成,以及Ag-CBB中的BIEs的长寿命光诱导吸收.
- 信号的空间统一性证实了同质的Ag兴奋剂,表明受控的BIE形成.
结论:
- 银介层剂在控制Cs3Bi2Br9.9中结合的介层激子的动态方面发挥着至关重要的作用.
- 这项研究提供了前所未有的洞察力,了解BIEs和STEs在单个粒子水平上的温度依赖相互作用.
- 这些发现为设计基于2D矿中的定制激子动态的先进光电子设备铺平了道路.
相关概念视频
02:42Valence Bond Theory
11.2K
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...
11.2K
03:24Hybridization of Atomic Orbitals I
65.5K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
65.5K
02:35Band Theory
17.0K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
17.0K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
48.1K
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,...
48.1K
01:01Energy Bands in Solids
1.8K
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
1.8K
02:42Ionic Crystal Structures
16.8K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.8K