Unfiltered

Overview

In unfiltered mode, the intensity (magnitude) of the cathodoluminescence (CL) signal is measured. The measurement is integrated over all wavelengths, angles, and polarizations for a defined time interval.

Unfiltered cathodoluminescence image showing full emission across wavelengths

Sometimes referred to as panchromatic, polychromatic, or black-and-white imaging.

Data collection

Unfiltered signal

The magnitude of the total CL signal (count rate or intensity) is measured using a light-sensitive detector such as a photomultiplier tube (PMT) or solid-state diode. The electron beam of the electron microscope may be continuously positioned at a defined location on the specimen (spot mode) or scanned rapidly over a defined area, and the measured CL signal is integrated over all locations.

Unfiltered CL image showing count‑rate distribution across the sample area

Counts rate or intensity of unfiltered signal

Unfiltered map

The electron beam is scanned across the specimen surface, and the emitted light intensity is recorded at each location and displayed as a map.

Cathodoluminescence intensity map of a periodic nanostructure array plotted across x–y spatial coordinates

Displays emitted light intensity in a map

Uses

Reveal texture in mineralogy, zonation, overgrowths, and micro-cracks; and reveal extended defects in semiconductor materials and devices.

Unfiltered cathodoluminescence example image showing full emission distribution

Example of an unfiltered CL image showing the spatial variation in the integrated CL emission from an array of compound semiconductor micro rods.

Applications

Unlock the power of cathodoluminescence—explore cutting-edge applications, dive into expert-led webinars, and discover insights through detailed application notes that fuel scientific breakthroughs.

Reveal Insights

Image showing cathodoluminescence techniques used for analyzing geoscience samples.

Cathodoluminescence techniques for the geosciences