Red Light Emitting “Push−Pull” Disubstituted Poly(1,4-phenylenevinylenes)

The “push−pull” electronically substituted systems poly(2[5]-chloro-5[2]-( n -hexyloxy)-1,4-phenylenevinylene) and poly(2[5]-bromo-5[2]-( n -hexyloxy)-1,4-phenylenevinylene) 1 and 2, respectively were synthesized by a modified soluble precursor route. Thermal elimination of polyether precursors to 1 and 2 yields the final conjugated polymers as free-standing, flexible red films. The polyether precursors may be film-cast from methanol to make light emitting diode (LED) devices which have red light emission in the 620 nm region. The ease of synthesis and processibility of 1 and 2 make these promising candidates for red light emitting LEDs.