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13 November 2000 Optical properties of crystalline tungsten oxide
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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.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael G. Hutchins, A. John Topping, N. S. Butt, Dawn Jeffrey, Ian D. Brotherston, Paul E. Y. Milne, Jose M. Gallego, and John R. Owen "Optical properties of crystalline tungsten oxide", Proc. SPIE 4104, Organic Photorefractives, Photoreceptors, and Nanocomposites, (13 November 2000);

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