Spatially resolved cathodoluminescence of luminescent materials using an EDX detector

Abstract

SummaryPanchromatic cathodoluminescence (CL) maps were collected in a scanning electron microscope equipped with an EDX (energy dispersive x-ray analysis) detector. These CL maps can readily be correlated with elemental maps obtained by EDX. Although EDX detectors are designed to be insensitive to light and therefore not optimized for high sensitivity CL measurements, high-resolution images can be obtained from luminescent materials without the need for additional hardor software. The method was tested on highly luminescent BaAl 2 S 4 : Eu 2+ thin films that have a potential use in flat panel displays. The spectral response and linearity of the overall system was determined by means of monochromatic light sources, illuminating the sample through an optical fibre. We studied the response of the EDX detector to the intensity of the incoming light as well as the influence of the detector settings. The observations were explained by numerical simulations.

Persistent luminescence in rare-earth codoped

“…Scanning electron microscopy (SEM) was performed using a FEI Quanta 200, equiped with EDX (energy dispersive x-ray analysis, EDAX Genesys 4000). The cathodoluminescence was monitored using the low energy channels of the EDX detector [12].…”

Study on the Use of Silicon Drift Detector to Get Information on Light Emitted by Luminescent Materials

“…For a sample which is insensitive to the electron beam, the size of the acquisition area should not have any effect on the low energy peak count rate. It is the case for the Gadox sample and for the CsI:Tl sample A, down to 10 µm (figures 11,12,13). For sample A at 2.5 µm and for sample B, it is clearly observed that the slope of the count rate curve is lower for smaller acquisition areas and that the maximum occurs at a higher probe current.…”

“…In their article, P. F. Smet et al studied the behavior of a Si-Li detector exposed to the light of luminescent BaAl2S4: Eu+ films [11]. They found that the effect of light on the EDX detector is a peak at very low energy.…”