The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2009
Filed:
Dec. 20, 2004
Won Jong Kwon, Daejeon, KR;
Ki Seok Jang, Daegu, KR;
Sang Ho Kim, Daejeon, KR;
Shin Jung Choi, Busan, KR;
Jin Young Park, Gwangju, KR;
Young Hee Lim, Daejeon, KR;
Won Jong Kwon, Daejeon, KR;
Ki Seok Jang, Daegu, KR;
Sang Ho Kim, Daejeon, KR;
Shin Jung Choi, Busan, KR;
Jin Young Park, Gwangju, KR;
Young Hee Lim, Daejeon, KR;
LG Chem, Ltd., Seoul, KR;
Abstract
Disclosed are viologen derivatives as an electrochromic material having improved stability and lifetime, a metal oxide electrode including the same, and an electrochromic device using the viologen derivative as an electrochromic material. The viologen derivative includes a suitable regulator group capable of increasing ΔE that is a potential difference between E(potential at the first redox reaction) and E(potential at the second redox reaction). When ΔE increases, the mole fraction of viologen molecules present in the second reduction state decreases. Therefore, it is possible to lower the mole fraction of viologen molecules present in an irreversibly reduced state at an applied potential, thereby increasing the lifetime of an electrochromic material and an electrochromic device.