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Materials 2017, 10(3), 312; doi:10.3390/ma10030312

New Developments in Cathodoluminescence Spectroscopy for the Study of Luminescent Materials

Centre for Phosphor and Display Materials, Wolfson Centre for Materials Processing, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK
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Academic Editors: Hubertus T. Hintzen and Benjamin Dierre
Received: 22 January 2017 / Revised: 7 March 2017 / Accepted: 15 March 2017 / Published: 17 March 2017
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Abstract

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. View Full-Text
Keywords: luminous efficacy; secondary electrons; backscattered electrons; charging; shielding; electron microscopy; decay; STEM-image; panchromatic image luminous efficacy; secondary electrons; backscattered electrons; charging; shielding; electron microscopy; decay; STEM-image; panchromatic image
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Engelsen, D.; Fern, G.R.; Harris, P.G.; Ireland, T.G.; Silver, J. New Developments in Cathodoluminescence Spectroscopy for the Study of Luminescent Materials. Materials 2017, 10, 312.

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