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Photovoltaic Switching of Electrochromic Materials

IP.com Disclosure Number: IPCOM000082893D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Shattuck, MD: AUTHOR [+3]

Abstract

When certain organic electron donors are combined with a suitable binder, e.g., AROCLOR* 5442 (a chlorinated polyphenyl resin) with chloroform as a solvent, they exhibit a significant photovoltage when illuminated with UV radiation.

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Photovoltaic Switching of Electrochromic Materials

When certain organic electron donors are combined with a suitable binder, e.g., AROCLOR* 5442 (a chlorinated polyphenyl resin) with chloroform as a solvent, they exhibit a significant photovoltage when illuminated with UV radiation.

It has also been observed that a charge-transfer complex is formed when a good donor and viologens are combined. As a result of this complex the viologen becomes electrochromic at much lower voltages (Approximately 0.2v). As a further consequence, the viologen/donor complex becomes colored without the application of external field and in image form without structural electrodes,
i.e., the donor photovoltage is created in image form and is sufficient to switch the viologen/donor complex to the blue color characteristics of viologen. In this way the necessity of a structural electrode array is eliminated and no external potential required for image formation.

Image erasure or bleaching requires the application of Approximately 2 volts. However, it can be speculated that a flooding illumination from the opposite direction should achieve the same effect with applied potential. That is, the photovoltage polarity in the donor reverses as the direction of illumination is reversed. * Trademark of Monsanto Chemical Co.

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