Patent ID: 7718096

Claim:
An electroactive device which device comprises a medium in the electroactive device, which medium composition comprises i) one or more solvents suitable as a medium in the electroactive device, ii) an effective amount of one or more additive compounds selected from the group consisting of ultraviolet light absorbers, and iii) an effective amount of one or more additive compounds selected from the group consisting of nitroxyls, hydroxyl amines and hydroxyl amine salts, wherein at least one of the one or more nitroxyls, hydroxyl amines and hydroxyl amine salts of component (iii) is a compound of formula I, II or III where G 1 and G 2 are independently alkyl of 1 to 4 carbon atoms or are together pentamethylene, Z 1 and Z 2 are each methyl, or Z 1 and Z 2 together form a linking moiety which may additionally be substituted by an ester, ether, hydroxy, oxo, cyanohydrin, amide, amino, carboxy or urethane group, X is an inorganic or organic anion, and where the total charge of cations h is equal to the total charge of anions j, wherein the electroactive device further contains a pair of electrodes and at least one compound or material that changes transmittance upon or after application of an electric stimulus.