期刊
SCIENCE ADVANCES
卷 8, 期 40, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abq4947
关键词
-
资金
- National Agency for Research under the program of future investment TEMPOS-CHROMATEM [ANR-10-EQPX-50]
- JCJC grant SpinE [ANR-20-CE42-0020]
- BONASPES project [ANR-19-CE30-0007]
- JCJC IMPULSE [ANR-19-CE42-0001]
- European Union [823717, 101017720]
- Elemental Strategy Initiative by MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [19H05790, 20H00354, 21H05233]
Tracking the lifespan of optical excitations is crucial in understanding the photophysics of materials. In this study, electron spectroscopies were used to explore the creation and decay of excitations in two representative optical materials. The developed cathodoluminescence excitation spectroscopy method allows for imaging energy transfer pathways at the nanometer scale.
Following optical excitations' life span from creation to decay into photons is crucial in understanding materials photophysics. Macroscopically, this is studied using optical techniques, such as photoluminescence excitation spec-troscopy. However, excitation and emission pathways can vary at nanometer scales, preventing direct access, as no characterization technique has the relevant spatial, spectral, and time resolution. Here, using combined elec-tron spectroscopies, we explore excitations' creation and decay in two representative optical materials: plasmonic nanoparticles and luminescent two-dimensional layers. The analysis of the energy lost by an exciting electron that is coincident in time with a visible-ultraviolet photon unveils the decay pathways from excitation toward light emission. This is demonstrated for phase-locked (coherent) interactions (localized surface plasmons) and non- phase-locked ones (point defect excited states). The developed cathodoluminescence excitation spectroscopy images energy transfer pathways at the nanometer scale, widening the available toolset to explore nanoscale materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据