Synthesis and light-emitting properties of poly[9-(4¢-tert-butylphenylenemethene)- fluoroene-co-9,9-dioctylfluorene]

A novel copolymer, poly[9-(4¢-tert-butylphenylenemethene)- fluoroene-co-9,9-dioctylfluorene], has been synthesized through the Yamamoto coupling method. The copolymer has good solubility and thermal stability with a glass transition temperature at 85 C. The PL spectrum of the copolymer shows a maximum emission peak at 530 nm. A polymer lightemitting diode (PLED) with the configuration ITO/ PEDOT/copolymer/Ca/Al has been fabricated. The device emits green light with an emission peak at 540 nm. A maximum brightness of 603 cd/m2 was achieved at a drive voltage of 24.3 V.