Application of di-ureasil ormolytes based on lithium tetrafluoroborate in solid-state electrochromic displays

摘要: In this study the sol–gel synthetic strategy was used to prepare organic–inorganic hybrid electrolyte systems composed of a di-urea cross-linked poly(ethylene oxide) (PEO)/siloxane (di-ureasil) matrix with wide concentration range lithium tetrafluoroborate (LiBF4). The assembly and preliminary characterization prototype solid-state electrochromic device based on four-layer sandwich structure incorporating these electrolytes doped controlled quantities LiBF4 are reported. composition xerogels indicated using notation d-U(900)nLiBF4 d-U(600)nLiBF4. representation average molecular weight host di-ureasil framework is identified as d-U(900) or d-U(600) subscript n expresses salt content in terms number ether oxygen atoms per Li+ cation. most conducting d-U(900)35LiBF4 (1.70 × 10−4 S cm−1 at about 95 °C). lowest decomposition temperature observed = 2.5 both d-U(600)nLiBF4 (250 °C 243 °C, respectively). Electrochromic devices assembled compositions 20 ≤ 35 presented good color contrast, maximum optical density 0.23 an encouraging performance coloring/bleaching process. transmittance visible region spectrum above 74% for all bleached samples analyzed.