Novel phosphorus-containing polymers with high-electron-affinity oxadiazole were synthesized and characterized by thermal analysis and spectroscopy (infrared, ultraviolet-visible, photoluminescence, cyclic voltammetry) measurements. These new polymers can be used as blue electroluminescent materials and as electron-transport layers in polymer light-emitting diodes. In this study, aromatic polyethers containing electron-transporting chromophores and emission chromophores were synthesized from 2,5-bis-(4-fluoroaryl)-1,3,4-oxadiazole and 2-(6-oxido-6H-dibenz<c,e><1,2> oxaphosphorin-6-yl)-1,4-naphthalenediol (DOPO-NBQ). The effects of reaction temperature and time on the formation of polyethers were investigated to obtain optimum conditions for polyether manufacturing. All the resulting polymers were thermally stable at <460 °C. The absorption peaks of these polymers were at 350–365 nm, whereas the photoluminescent peaks were at 460–481 nm. But, the intensity of polymer absorption decreased and a blue shift was observed in the photoluminescent spectra as the temperature increased. In addition, these polymers containing the electron-transporting oxadiazole indeed showed extra reduction potentials in cyclic voltammetry measurements.
Relation:
JOURNAL OF APPLIED POLYMER SCIENCE, 85(11):2367-2376.
