Tunable electrofluorochromic device from electrochemically controlled complementary fluorescent conjugated polymer films.

The fluorescent behavior of the electrofluorochromic devices (Type I) of greenish-yellow emitting P1 and blue emitting P2 can be reversibly switched between the nonfluorescent (oxidized) state and the fluorescent (neutral) state with a superb on/off ratio of 23.8 and 21.9, respectively.

Electrofluorescence switching from a multilayer thin film by spin-assisted layer-by-layer assembly of an anionic fluorescent conjugated polyelectrolyte with poly(diallyldimethylammonium chloride).

An electrofluorochromic conjugated polyelectrolyte, PFTSO3Na as a polyanion, was synthesized and used in the fabrication of layer-by-layer (LbL) assembled multilayer film with poly(diallyldimethylammonium chloride) (PDDA) as a polycation. The electrofluorescent device (EFD) fabricated from the multilayer thin film of PFTSO3Na /PDDA emits blue light under UV excitation. The fluorescence intensity can be switched off upon electrochemical oxidation.