ELECTROCHROMIC DISPLAY ELEMENT AND FULL-COLOR ELECTROCHROMIC DISPLAY ELEMENT
申请人:KONICA MINOLTA HOLDINGS, INC.
公开号:EP1887416A1
公开(公告)日:2008-02-13
This invention provides an electrochromic display element having a significantly improved memory effect, and a full-color electrochromic display element that can easily realize full colorization and has a significantly improved memory effect. The electrochromic display element and the full-color electrochromic display element are characterized by comprising an electrochromic compound represented by general formula (1) between opposed electrodes, the opposed electrodes being driven and operated so that the electrochromic compound is color developed upon oxidation and is rendered colorless upon reduction.
The objective of the invention is to provide a thin film having a long light-emitting life span, and an organic electroluminescence element. The above problem is solved by the thin film containing a light-emitting metallic complex and a host, the light-emitting metallic complex being represented by general formula (1) and satisfying formula (1), and the host being: a nonmetallic organic compound demonstrating phosphorescent light-emission at room temperature; a compound demonstrating heat activated-type delayed fluorescence; or a compound exhibiting an inverse intersystem crossing phenomenon between a singlet excitation state demonstrating a level higher than the lowest singlet excitation state, and a triplet excitation state demonstrating a level higher than the lowest triplet excitation state.