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Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
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Transition radiation in EELS and cathodoluminescence.
Michael Stöger-Pollach1, Lukáš Kachtík1, Bernhard Miesenberger1
1University Service Center for Transmission Electron Microscopy, Technische Universität Wien, Wiedner Hauptstraße 8-10, 1040 Wien, Austria.
Ultramicroscopy
|December 2, 2016
Summary
The study measured transition radiation excitation probability using optical and electron energy loss spectrometry. Results show transition radiation is minor for aluminum, suggesting it
Area of Science:
- Condensed matter physics
- Materials science
- Spectroscopy
Background:
- Transition radiation occurs when charged particles cross an interface between media with different dielectric properties.
- Understanding transition radiation is crucial for interpreting spectroscopic data in electron microscopy.
Purpose of the Study:
- To measure the excitation probability of transition radiation.
- To compare experimental results with theoretical predictions.
- To assess the impact of transition radiation on electron energy loss spectrometry (EELS) and cathodoluminescence (CL) data.
Main Methods:
- Optical spectrometry of emitted light.
- Electron energy loss spectrometry (EELS).
- Measurements performed in a transmission electron microscope with varying beam energies.
Main Results:
- Experimental results for transition radiation excitation probability agree well with theoretical models.
- Transition radiation is emitted only at the vacuum/sample interface.
- The influence of transition radiation on the low-loss EELS spectrum of aluminum is minor.
Conclusions:
- The study provides a method to evaluate the significance of transition radiation in EELS and CL data.
- Transition radiation's impact is minimal for aluminum and potentially negligible for many other materials.
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