Colour change of co-doped yttrium aluminium borate crystals under illumination with different white light sources

Elmar Fuchs 1  and Karl Gatterer 1
  • 1 Institute of Physical and Theoretical Chemistry, Graz University of Technology, Rechbauerstrasse 12, 8010, Graz, Austria

Abstract

A colour change of doped YAB crystals and microcrystalline powders takes place upon illumination with different white light sources. This paper presents extensive experimental data on the new materials Ho,Nd:YAB; Ho,Cr:YAB, Nd,Cr:YAB and Ho,Nd,Cr:YAB, resulting in a chart providing the observed crystal colours and chromaticity differences of the materials under illumination with seven different types of white light sources. The microcrystalline powders could be used as coatings in order to produce a special colour changing effect. Furthermore, the colour table presented enables the observer to discriminate the investigated light sources at one glance.

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