期刊
ACS PHOTONICS
卷 8, 期 6, 页码 1539-1547出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c00235
关键词
cathodoluminescence; nanophosphors; scanning transmission electron microscopy (STEM); single particle spectroscopy
类别
资金
- Photonics at Thermodynamic limits Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0019140]
- Arnold and Mabel Beckman Foundation
- Eastman Kodak fellowship
- NSF Alan T. Waterman Award
- National Science Foundation [ECCS-1542152]
Our study involved the development of a library of 11 unique lanthanide-doped nanophosphors for high-resolution, multicolor electron microscopy. Transmission electron microscopy revealed that these nanophosphors exhibit strong cathodoluminescence spectra under electron beam, with high spatial localization characteristics.
Lanthanide-doped nanophosphors have emerged as promising optical labels for high-resolution, multicolor electron microscopy. Here, we develop a library of 11 unique lanthanide-doped nanophosphors with average edge lengths of 15.2 +/- 2.0 nm (N = 4284). These nanophosphors consist of an electron-stable BaYF5 host lattice doped at 25% atomic concentration with the lanthanides Pr3+, Nd3+, Sm3+, Eu3+, Tb3+, Dy3+, Ce3+, Ho3+, Er3+, Tm3+, and Yb3+. Under similar to 100 pA/nm(2) beam current in a transmission electron microscope, each nanophosphor species exhibits strong cathodoluminescence spectra with sharp characteristic emission lines for each lanthanide. The bright emission and stability of these nanoparticles enable not only ensemble, but also single-particle cathodoluminescence spectroscopy, which we demonstrate with BaYF5:Ln(3+), where Ln(3+) = Tb3+, Ho3+, Er3+, Sm3+, Eu3+, or Pr3+. Single-particle cathodoluminescence corresponds directly with HAADF intensity across nanoparticles, confirming high spatial localization of the measured cathodoluminescence signal of lanthanide-doped nanophosphors. Our synthesis and characterization of sub-20 nm, electron-stable nanophosphors provides a robust material platform to achieve single-molecule labeled correlative cathodoluminescence electron microscopy, a critical foundation for high-resolution correlation of single molecules within the context of cellular ultrastructure.
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