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Heterofulvalene Halide Organic Electrochromic Display with Memory

IP.com Disclosure Number: IPCOM000088970D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Green, DC: AUTHOR [+3]

Abstract

Electrochemical reactions of organic molecules to form colored solids on optically transparent electrodes have potential utility as electrochromic display devices with memory [1]. The most studied system to date has been the viologen dictation acceptor [1] Its use in any practical device may be precluded by problems due to toxicity, oxygen sensitivity and decomposition [2]. However, it had previously been shown that heterofulvalene donors can be electrooxidatively reacted to form colored solid halide salts [3].

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Heterofulvalene Halide Organic Electrochromic Display with Memory

Electrochemical reactions of organic molecules to form colored solids on optically transparent electrodes have potential utility as electrochromic display devices with memory [1]. The most studied system to date has been the viologen dictation acceptor [1] Its use in any practical device may be precluded by problems due to toxicity, oxygen sensitivity and decomposition [2]. However, it had previously been shown that heterofulvalene donors can be electrooxidatively reacted to form colored solid halide salts [3].

The immunity of this donor system to the above-mentioned problems encouraged the examination of the oxidation of TTF on an electrode surface. The TTF donor (10/-3/ m) was dissolved in CH(3)CN solvent with Et(4) NBr
(0.1N) present as electrolyte and reactive counter ion. Immediately after oxidation of the TTF molecule, a purple film was found to form on a Pt or SnO(2) electrode surface. Reversing the potential was found to immediately dissolve this precipitate by reducing it back to the neutral species. It is believed that these heterofulvalene donors may offer unique advantages in this type of device due to their stability, low toxicity, highly colored nature and conductivity [4] as solid state salts. REFERENCES [1] I. F. Chang in "Proceedings of International Symposium on Non-Emissive Electro-Optic Displays," A. F. Kmetz and F. K. Willisen (Ed.), Plenum, New York (1975). [2] K. Belinko, App...