Unique variable-gap polyheterocycles for high-contrast dual polymer electrochromic devices

被引:33
作者
Reynolds, JR
Kumar, A
Reddinger, JL
Sankaran, B
Sapp, SA
Sotzing, GA
机构
关键词
electrochemical polymerization; electrochemical doping; in situ electrochemical spectroscopy; polythiophene and derivatives; low-bandgap conjugated polymers;
D O I
10.1016/S0379-6779(97)80248-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have carried out studies on an extensive series of electron rich monomers which oxidatively polymerize at low potentials. Alkyl derivatized poly(3,4-ethylenedioxythiophenes) (PEDOT's) exhibit a high degree of visible light transparency in the oxidized state, while being an opaque blue in the reduced state. These polymers can be switched rapidly (sub-second) between states with high optical contrasts of up to 60% Delta T. Multi-ring monomers have been prepared using EDOT moieties as terminal polymerizable units, to yield the most easily oxidized thiophene based monomers reported to date, which efficiently electropolymerize. Polymers have been prepared with electronic band gaps that range from a relatively low 1.4 eV up to 2.5 eV. The inclusion of transition metal ions, electronically coupled to the conjugated backbone, allows further tuning of the polymer's redox properties. These polymers behave as complementary electrochromic materials and have been employed in dual polymer electrochromic devices. Judicious choice of proper cathodically and anodically coloring polymers yield devices which exhibit high optical contrasts (>50% T), multi-color capabilities, long term switching stability (>10(4) deep switches), and rapid switching characteristics with 25% optical contrast observed with 100 mS switches.
引用
收藏
页码:1295 / 1298
页数:4
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