Photochromic coloration of WO3 with visible light

Type of Publication: Journal article
Publication status: Published
URI (citable link): http://nbn-resolving.de/urn:nbn:de:bsz:352-0-413533
Author: Bechinger, Clemens; Wirth, E.; Leiderer, Paul
Year of publication: 1996
Published in: Applied Physics Letters ; 68 (1996), 20. - pp. 2834-2836. - ISSN 0003-6951. - eISSN 1077-3118
DOI (citable link): https://dx.doi.org/10.1063/1.116340
Summary:
Thin amorphous films of tungsten oxide (WO3) are well known to change their optical absorption behavior upon light exposure, usually referred to as photochromic effect. Since the formation of color centers is closely related to the optical creation of electron‐hole pairs the sensitivity of the photochromic effect in WO3 is limited to energies above its band‐gap energy of 3.25 eV, corresponding to the near‐ultraviolet range. We will demonstrate that in case of a thin cadmium sulfide (CdS) layer underneath the tungsten oxide film the sensitivity of photochromism is shifted into the visible range. This result is interpreted in terms of charge carrier injection from the CdS into the WO3. Apart from a more detailed understanding of the photochromic effect this may have also relevance for technical applications.
Subject (DDC): 530 Physics
Link to License: In Copyright

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BECHINGER, Clemens, E. WIRTH, Paul LEIDERER, 1996. Photochromic coloration of WO3 with visible light. In: Applied Physics Letters. 68(20), pp. 2834-2836. ISSN 0003-6951. eISSN 1077-3118. Available under: doi: 10.1063/1.116340

@article{Bechinger1996Photo-39455, title={Photochromic coloration of WO3 with visible light}, year={1996}, doi={10.1063/1.116340}, number={20}, volume={68}, issn={0003-6951}, journal={Applied Physics Letters}, pages={2834--2836}, author={Bechinger, Clemens and Wirth, E. and Leiderer, Paul} }

Wirth, E. Bechinger, Clemens 1996 terms-of-use Leiderer, Paul Wirth, E. 2017-06-29T08:23:39Z Bechinger, Clemens Thin amorphous films of tungsten oxide (WO3) are well known to change their optical absorption behavior upon light exposure, usually referred to as photochromic effect. Since the formation of color centers is closely related to the optical creation of electron‐hole pairs the sensitivity of the photochromic effect in WO3 is limited to energies above its band‐gap energy of 3.25 eV, corresponding to the near‐ultraviolet range. We will demonstrate that in case of a thin cadmium sulfide (CdS) layer underneath the tungsten oxide film the sensitivity of photochromism is shifted into the visible range. This result is interpreted in terms of charge carrier injection from the CdS into the WO3. Apart from a more detailed understanding of the photochromic effect this may have also relevance for technical applications. Photochromic coloration of WO<sub>3</sub> with visible light 2017-06-29T08:23:39Z Leiderer, Paul eng

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