Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2006-05-02
2006-05-02
Mack, Ricky (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S265000, C359S267000
Reexamination Certificate
active
07038828
ABSTRACT:
Large contrast ratio and rapid switching laminated electrochromic (EC) polymer device includes transparent electrode, cathodic EC polymer, gel electrolyte, and counter-electrode. Preferably the cathodic EC polymer is a poly(3,4-propylenedioxythiophene) derivative, PProDOT-Me2. Counter-electrode is a conductive coating deposited on transparent substrate, with preferred coatings including gold and highly conductive carbon. Lithography and sputtering can be employed to pattern a gold layer, while screen printing can be employed to similarly pattern graphite. Empirical studies of preferred device indicate a color change of high contrast ratio of transmittance (>50% T) is rapidly (0.5–1 s) obtained upon applied 2.5V, repeatable to at least 10,000 times, as estimated by electrochemistry. Dual layer EC devices including PProDOT-Me2are also disclosed, as are methods for synthesizing preferred EC polymers. Preferred synthesis method for obtaining PProDOT-Me2involves refluxing reagents in toluene in the presence of catalyst, while continually removing methanol byproduct from refluxing solution.
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Taya Minoru
Xu Chunye
Anderson Ronald M.
Mack Ricky
Stultz Jessica
University of Washington
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