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Proceedings Paper

Optical properties of crystalline tungsten oxide
Author(s): Michael G. Hutchins; A. John Topping; N. S. Butt; Dawn Jeffrey; Ian D. Brotherston; Paul E. Y. Milne; Jose M. Gallego; John R. Owen
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Paper Abstract

While designing a thermal control device based upon crystalline tungsten oxide it is vital to have knowledge of both n, the real part of the refractive index and k, the complex part. With this knowledge it is possible to predict the performance of an electrochromic device at different wavelengths of radiation. We performed a series of experiments on crystalline samples of tungsten oxide where both n and k were carefully determined from spectral reflectance and transmittance measurements after set amounts of charge were inserted electrochemically, thus reducing the tungsten oxide. The trends for n and k are different, which has implementations for device performance and design. We also investigated the effect of deposition temperature on the optical properties of crystalline tungsten oxied. This has implications for both the substrate that may be u sed in a device and the construction of the device. The final data we shall present are some electromechanical studies of insertion into crystalline tungsten oxide flake samples and powder samples. The flakes and powder are deposited in a similar way to a graphite paste electrodes used in Li ion battery studies. This is a possible route to a flexible eleectrochromic device based upon crystalline tungsten oxide.

Paper Details

Date Published: 13 November 2000
PDF: 8 pages
Proc. SPIE 4104, Organic Photorefractives, Photoreceptors, and Nanocomposites, (13 November 2000); doi: 10.1117/12.406483
Show Author Affiliations
Michael G. Hutchins, Oxford Brookes Univ. (United Kingdom)
A. John Topping, Oxford Brookes Univ. (United Kingdom)
N. S. Butt, Oxford Brookes Univ. (United Kingdom)
Dawn Jeffrey, Defence Evaluation and Research Agency Malvern (United Kingdom)
Ian D. Brotherston, Defence Evaluation and Research Agency Malvern (United Kingdom)
Paul E. Y. Milne, Defence Evaluation and Research Agency Malvern (United Kingdom)
Jose M. Gallego, Pilkington Group Research (United Kingdom)
John R. Owen, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 4104:
Organic Photorefractives, Photoreceptors, and Nanocomposites
Keith L. Lewis; Klaus Meerholz; Klaus Meerholz, Editor(s)

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