Electrochromic display devices comprising substituted fluorene compounds
First Claim
1. In a reversible electrochromic display device comprising a reactive medium between two electrically conductive electrodes at least one of which is transparent, said medium comprising an anhydrous solvent and an oxidant/reductant pair in which the reductant is an electron acceptor, the improvement according to which the oxidant is a substituted fluorene compound having the formula ##STR2## wherein each of R and R°
- is hydrogen or an alkyl group having up to 20 carbon atoms and each of R1 through R8 is hydrogen or an alkoxy group containing up to 20 carbon atoms, with at least 2 of the groups R1 through R8 being alkoxy groups.
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Abstract
Electrochromic display devices having very desirable stability and reversibility are obtained using as the oxidant certain fluorene compounds substituted with at least two alkoxy groups per molecule. The display device comprises a reactive medium between two electrically conductive electrodes at least one of which is transparent. The reactive medium comprises an anhydrous solvent and an oxidant/reductant pair.
35 Citations
6 Claims
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1. In a reversible electrochromic display device comprising a reactive medium between two electrically conductive electrodes at least one of which is transparent, said medium comprising an anhydrous solvent and an oxidant/reductant pair in which the reductant is an electron acceptor, the improvement according to which the oxidant is a substituted fluorene compound having the formula ##STR2## wherein each of R and R°
- is hydrogen or an alkyl group having up to 20 carbon atoms and each of R1 through R8 is hydrogen or an alkoxy group containing up to 20 carbon atoms, with at least 2 of the groups R1 through R8 being alkoxy groups.
- View Dependent Claims (2, 3, 4, 5, 6)
Specification
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- Resources
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Current AssigneeInternational Business Machines Corporation
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Original AssigneeInternational Business Machines Corporation
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InventorsClecak, Nicholas J., Keller, Gary S., Grant, Barbara D., Jaffe, Annette B.
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Primary Examiner(s)Padgett, Benjamin R.
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Assistant Examiner(s)Gron, T. S.
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Application NumberUS05/890,170Time in Patent Office323 DaysField of Search350/357, 96/1 E, 96/90 R, 252/408US Class Current359/265CPC Class CodesC09K 9/02 Organic tenebrescent materialsG02F 1/1503 caused by oxidation-reducti...
