The DX centre
T.N. Morgan
Semiconductor Science and Technology
A general, convergent approach to the synthesis of a series of stilbene- and azo-based donor-acceptor, second-order nonlinear optical (NLO) chromophores is reported. The synthetic strategy enables preparation of both acid- and base-reactive structures, yielding protected, diamine-functionalized chromophores which can be liberated using either acidic or alkaline regents for incorporation into polyimide backbones. Three such chromophores, bis(4-aminophenyl)[4-(2-(4-nitrophenyl)vinyl)phenyl]amine, bis(4-aminophenyl)[4-(2-(6-nitrobenzothiazol-2-yl)vinyl)phenyl]amine, 2-[4-((4-(bis(4-aminophenyl)amino)phenyl)diazenyl)phenyl]-2-phenyl-1,1-dicyan oethylene, all having high thermal stabilites, were synthesized, characterized, and condensed with hexafluoroisopropylidene diphthalic anhydride or 2-(1,3-dioxoisobenzofuran-5-ylcarbonyloxy)ethyl 1,3-dioxoisobenzofuran-5-carboxylate to yield six high glass transition temperature polyimides (T(g) as high as 313 °C) for use as poled NLO materials. After casting as thin films, curing, and electric field corona poling, these materials exhibit χ((2)) (1064 nm) responses as high as 82.0 pm/V and negligible decay in response upon aging in air at 100 °C for over 1000 h.
T.N. Morgan
Semiconductor Science and Technology
J. Paraszczak, J.M. Shaw, et al.
Micro and Nano Engineering
Lawrence Suchow, Norman R. Stemple
JES
L.K. Wang, A. Acovic, et al.
MRS Spring Meeting 1993