Electrochromic display based on Langmuir-Blodgett films of praseodymium bisphthalocyanine
Abstract
The design of a new electrochromic display based on Langmuir-Blodgett (LB) films of the praseodymium bisphthalocyanine complex is reported. In situ UV-VIS spectra of the display show four colour changes, blue→green→yellowish→red, when a potential ranging from –2 to +2 V is applied. The device retains its colouration under open-circuit conditions. After 105 cycles no significative changes are observed in the spectra. The device remains in the red form at open circuit for six months, and can be cycled again 103 times without significative modification of its behaviour.