Electrochromic formulation, method for the production thereof, and organic electrochromic component
OwnerAndreas Kanitz, Marek Maleika +1inventors
InventorsAndreas Kanitz, Marek Maleika, Wolfgang Roth
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Abstract
Formulations can be used in organically based electrochromic components, such as for the production of state indicators, the activated state of which is maintained for as long as possible without an electric current. Organically based electrochromic formulations contain one or more optionally cathodically (coloring) activatable electrochromic coloring systems, as well as an anodically activatable antagonist formed of an amine which dimerizes to a hydrazinium salt by releasing an electron. Titanium dioxide is introduced as an image background (maximum opacity), and additionally a dispersant is introduced which can be crosslinked or partly crosslinked.
Claims16
1-7. (canceled)
A bistable switchable electrochromic formulation comprising:
- a cathodically switchable electrochromic color system;
- an anodically switchable antagonist having the following structure I
- where
- “Spacer” stands for an alkene grouping with up to 18 carbon atoms,
- R is selected from the group consisting of alkyl residues with 2 to 10 carbon atoms, hydroxyalkyl residues with 2 to 10 carbon atoms, phenyl, p-tolyl, m-tolyl and mesityl residues, residues suitable for forming dimers and polymers and have a free valence, and residues suitable for crosslinking the two R groups, such that the two R groups bind in a bidentate manner to the nitrogen,
- A− is an anion, and
- K+ is a cation;
- a white pigment;
- and
- a dispersing agent which can be at least partly crosslinked.
A method for producing a bistable switchable electrochromic formulation, comprising:
- providing an anodically switchable antagonist having the following structure I
- where
- “Spacer” stands for an alkene grouping with up to 18 carbon atoms,
- R is selected from the group consisting of alkyl residues with 2 to 10 carbon atoms, hydroxyalkyl residues with 2 to 10 carbon atoms, phenyl, p-tolyl, m-tolyl and mesityl residues, residues suitable for forming dimers and polymers and have a free valence, and residues suitable for crosslinking the two R groups, such that the two R groups bind in a bidentate manner to the nitrogen,
- A− is an anion, and
- K+ is a cation;
- using a speed mixer to mix the anodically switchable antagonist, a white pigment and a cathodically switchable electrochromic color system in a dispersing agent, such that a paste is produced having a viscosity suitable for doctor blade processing.
An organic electrochromic component comprising:
- at least first and second electrodes;
- and
- a bistable switchable electrochromic formulation sandwiched between the first and second electrodes, the electrochromic formulation comprising:
- a cathodically switchable electrochromic color system;
- an anodically switchable antagonist having the following structure I
- where
- “Spacer” stands for an alkene grouping with up to 18 carbon atoms,
- R is selected from the group consisting of alkyl residues with 2 to 10 carbon atoms, hydroxyalkyl residues with 2 to 10 carbon atoms, phenyl, p-tolyl, m-tolyl and mesityl residues, residues suitable for forming dimers and polymers and have a free valence, and residues suitable for crosslinking the two R groups, such that the two R groups bind in a bidentate manner to the nitrogen,
- A− is an anion, and
- K+ is a cation;
- a white pigment;
- and
- a dispersing agent which can be at least partly crosslinked.
Dependencies are inferred from the claim text.