ELECTROCHROMIC ELEMENT, OPTICAL DENSITY VARYING ELEMENT, OPTICAL ELEMENT, AND PHOTOGRAPHING UNIT

摘要

PROBLEM TO BE SOLVED: To provide an electrochromic element whose response speed is high to light of a variety of wavelengths. SOLUTION: An electrochromic element has a semiconductor material and an electrochromic material. The semiconductor material is a nano-porous semiconductor material whose roughness coefficient is 20 or larger, and it has at least one kind of electrochromic materials shown in formulas (1), (2) or (3) on the surface of the semiconductor material. In these formulas, V1through V24are a hydrogen atom or a monohydric substituent respectively; R1through R6are a hydrogen atom, an alkyl group, an aryl group or a heterocyclic ring group respectively; L1through L6are a methine group or a nitrogen atom respectively; n1through n3are 0, 1, 2 or 3 respectively; M1through M3are electric charge balance pair ions; m1through m1are figures each of which is 0 or larger and is needed to neutralize electric charges of molecules. When n1through n3are 0, R1through R6show an aryl group respectively, and the compounds in the formulas (1) through (3) have at least one from a sulfo group, a phosphono group or a phosphato group respectively. COPYRIGHT: (C)2006,JPO&NCIPI