Synthesis and luminescent characteristics of novel phosphorus containing light-emitting polymers

Organic light-emitting diodes (OLEDs) have been developed recently, however, the efficiency of electroluminescent devices needs to be further improved. In this study, the electron-transporting chromophores were introduced into an emission polymer to increase its electron affinity. Several phosphorus-containing emission chromophores were synthesized and incorporated with electron-transporting chromophores. The effect of different structures on the optoelectric properties was investigated in detail. s-(4-fluorophenyl)-1,3,4-oxadiazole and 9,10-dihydro-oxa-10-phosphaphenanthrene-10-oxide (DOPO) derivatives were used as electron transport and emission monomers, respectively. The DOPO derivatives that contain benzene, biphenyl or 1,4-naphthalene were synthesized. The emission chromophores emit blue light as expected. Aromatic polyethers were obtained by nucleophilic substitution reaction of oxadiazole-activated bis(halide) monomers with bis(phenol) monomers. All the resulting polymers were thermally stable below 450°C. The absorption peaks of these polymers varied from 325 to 350 nm, while the photoluminescent peaks varied from 377 to 464 nm.