Electroluminescent arrangements
View Patent ↗3,4-Polyalkylenedioxythiophene dispersions comprising polyanions and cationic 3,4-polyalkylenedioxythiophenes, in particular those of the formula (I) in which n is an integer from 3 to 100, preferably from 4 to 15, and X is —(CH 2 ) x —CR 1 R 2 —(CH 2 ) y —, where R 1 and R 2 , independently of one another, are H, an optionally substituted alkyl radical having from 1 to 20 carbon atoms, an aryl radical having from 6 to 14 carbon atoms or —CH 2 —OR 3 , where R 3 =H, alkyl or —CH 2 —CH 2 —CH 2 —SO 3 H, and x and y are each, independently of one another, an integer from 0 to 9, in which at least 90% of the particles are <50 nm, can be employed in electroluminescent arrangements having a long service life and high luminosity.
1. A dispersion comprising:
polyanions;
cationic 3,4-polyalkylenedioxythiophenes; and
a solvent comprising water and optionally alcohol,
wherein said dispersion has a weight ratio of cationic 3,4-polyalkylene-dioxythiophene to polyanion of from 1:8 to 1:25, and 90% by weight of the particles of the dispersion being less than 40 nm.
2. The dispersion according to claim 1 , wherein the 3,4-polyalkylenedioxythiophenes are represented by formula (I),
wherein,
n is an integer from 3 to 100, and
X is —(CH 2 ) x —CR 1 R 2 —(CH 2 ) y —, wherein
R 1 and R 2 , independently of one another, are selected from the group consisting of H, an optionally substituted alkyl radical having from 1 to 20 carbon atoms, an aryl radical having from 6 to 14 carbon atoms, and
—CH 2 -0R 3 ,
wherein R 3 is selected from the group consisting of H, alkyl and
—CH 2 —CH 2 —CH 2 —SO 3 H,
and
x and y are each, independently of one another, an integer from 0 to 9.
3. The dispersion according to claim 2 , wherein n is an integer from 4 to 15.
4. The dispersion according to claim 1 , wherein the dispersion is a 3,4-polyethylenedioxythiophene/polystyrene sulfonate dispersion.