Electrochromic device

摘要

An electrochromic device comprising a pair of glass, plastic plates or plastic films At least one plate or film, is provided with an electrically conductive coating. At least one plate or film and its conductive coating are transparent and the other may be mirrored. The plates or films are joined together and form a volume filled with an electrochromic medium which comprises at least one reducible electrochromic substance OX₂ and at least one oxidizable electrochromic substance RED₁. The OX₂ corresponds to the formula in which R²⁰¹ and R²⁰², each are alkyl, cycloalkyl, alkenyl, aralkyl, aryl, -[C(PQ)]^- or a bivalent bridge B, Z²⁰¹ is a bivalent radical of the formulae CR²¹⁰R²¹¹, O, C-O or o-phenylene, R²¹⁰ and R²¹¹, each are hydrogen, methyl or ethyl, or CR²¹⁰R²¹¹ is C₃- to C₇-cycloalkane-1,1-diyl. The rings C, D, E and F, each may be substituted by up to 4 alkyl and/or alkoxy radicals, or respectively, may be linked via a -(CH₂)₄- or -CH-CH-CH-CH- bridge. P and Q, each are -CN or -COO-alkyl. X- is an anion.