阴极发光
超短脉冲
显微镜
量子点
钻石
电子显微镜
光电子学
电子
光学
发光
纳米技术
材料科学
物理
作者
Ye-Jin Kim,Oh-Hoon Kwon
出处
期刊:ACS Nano
[American Chemical Society]
日期:2021-12-13
标识
DOI:10.1021/acsnano.1c06260
摘要
Implementing the modern technologies of light-emitting devices, light harvesting, and quantum information processing requires the understanding of the structure-function relations at spatial scales below the optical diffraction limit and time scales of energy and information flows. Here, we distinctively combine cathodoluminescence (CL) with ultrafast electron microscopy (UEM), termed CL-UEM, because CL and UEM synergetically afford the required spectral and spatiotemporal sensitivities, respectively. For color centers in nanodiamonds, we demonstrate the measurement of CL lifetime with a local sensitivity of 50 nm and a time resolution of 100 ps. It is revealed that the emitting states of the color centers can be populated through charge transfer among the color centers across diamond lattices upon high-energy electron beam excitation. The technical advance achieved in this study will facilitate the specific control over energy conversion at nanoscales, relevant to quantum dots and single-photon sources.
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