Please use this identifier to cite or link to this item:
Title: New Developments in Cathodoluminescence Spectroscopy for the Study of Luminescent Materials
Authors: den Engelsen, D
Fern, GR
Harris, PG
Ireland, TG
Silver, J
Keywords: luminous efficacy;secondary electrons;backscattered electrons;charging;;shielding;electron microscopy;decay;STEM-image;panchromatic image
Issue Date: 2017
Citation: den Engelsen, D., Fern, G.R., Harris, P.G., Ireland, T.G. and Silver, J. (2017) ‘New Developments in Cathodoluminescence Spectroscopy for the Study of Luminescent Materials’, Materials. 10(3), 312, pp. 1-16. doi: 10.3390/ma10030312.
Abstract: Copyright © 2017 by the authors. Herein, we describe three advanced techniques for cathodoluminescence (CL) spectroscopy that have recently been developed in our laboratories. The first is a new method to accurately determine the CL-efficiency of thin layers of phosphor powders. When a wide band phosphor with a band gap (Eg > 5 eV) is bombarded with electrons, charging of the phosphor particles will occur, which eventually leads to erroneous results in the determination of the luminous efficacy. To overcome this problem of charging, a comparison method has been developed, which enables accurate measurement of the current density of the electron beam. The study of CL from phosphor specimens in a scanning electron microscope (SEM) is the second subject to be treated. A detailed description of a measuring method to determine the overall decay time of single phosphor crystals in a SEM without beam blanking is presented. The third technique is based on the unique combination of microscopy and spectrometry in the transmission electron microscope (TEM) of Brunel University London (UK). This combination enables the recording of CL-spectra of nanometre-sized specimens and determining spatial variations in CL emission across individual particles by superimposing the scanning TEM and CL-images.
Appears in Collections:Wolfson Centre for Sustainable Materials Development and Processing

Files in This Item:
File Description SizeFormat 
FullText.pdf2.35 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons