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. 2,5-Bis-(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 degreesC. The absorption peaks of these polymers varied from 325 to 350 nm, while the photoluminescent peaks varied from 377 to 464 nm. (C) 2000 Elsevier Science Ltd. All rights reserved.