“…However, a dual peak and large red-shift for a long-wavelength peak were observed for BLD1 and BLD3 when the dielectric constant of the solvent exceeds that of chloroform in those chromophores suggesting the transition from the neutral polyene limit to a molecule with partial zwitterionic (cyanine) character. 15,17,33 The absorption maxima (l max ) of chromophores BLD1-BLD4 in film were (l max ) 1105 nm, 733 nm, 1099 nm and 748 nm, respectively, which were different from the absorption in solution which may be due to the polar environment in the solid-state. 33,34…”