有机分子作为从六边形化和米卡的可见范围单光子发射的来源
Michael Neumann1,2, Xu Wei1,3, Luis Morales-Inostroza4
1Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon 16419, Republic of Korea.
ACS nano
|June 5, 2023
概括
在2D六角化 (hBN) 中的室温单光子发射器 (SPEs) 不是晶体缺陷. 研究表明,这些SPE来自有机分子,特别是在hBN/基质接口.
科学领域:
- 材料科学 材料科学 材料科学
- 量子光学是一种量子光学.
- 固态物理 固态物理
背景情况:
- 二维六角化 (2D hBN) 容纳室温单光子发射器 (SPEs),引起了研究的重大兴趣.
- 尽管进行了广泛的研究,但这些SPE的微观起源,特别是接近2 eV的SPE,仍然未被确定.
- 之前的假设集中在hBN网格内的点缺陷上,但未能解释观察到的实验异质性.
研究的目的:
- 在2D hBN中确定异质单光子发射在2 eV的微观起源.
- 调查样品制备和加工残留物在这些SPE的形成中的作用.
- 为了确定在热处理过程中形成的发射器的确切位置.
主要方法:
- 使用2D hBN. 的标准样品准备协议.
- 在样本分析过程中仔细控制和解开混因素.
- 使用先进的表征技术研究了发射器的特性和位置.
主要成果:
- 证明hBN中~2 eV的异质单光子发射来自有机分子,可能是芳香光体.
- 确立了SPE外观在样本准备过程中对有机加工残留的关键依赖.
- 显示热处理的发射器位于hBN/基板接口,而不是在hBN晶体内.
- 在另一种二维绝缘体,光合金中观察到类似的SPEs.
结论:
- 在2D hBN中广泛研究的SPEs不是内在的晶体缺陷,而是与有机污染物有关.
- 了解有机残留物和接口的作用对于控制和利用2D材料中的SPEs至关重要.
- 这些发现开辟了通过利用有机分子和接口来设计单光子源的新途径.
相关概念视频
01:14Molecular Spectroscopy: Absorption and Emission
2.4K
Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
2.4K
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
1.6K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.6K
02:39Emission Spectra
55.7K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
55.7K
01:32UV–Vis Spectroscopy of Conjugated Systems
7.1K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent...
One of the factors influencing λmax is the extent...
7.1K
02:55Exceptions to the Octet Rule
28.5K
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
28.5K
03:24Hybridization of Atomic Orbitals I
47.4K
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...
47.4K