A new p-type conjugated copolymer, poly(9,10-diethynylanthracene-alt-9,9-didodecylfluorene) (PDADF), which is composed of ethynyl-linked alternating anthracene/fluorene, is synthesized via a palladium(II)-catalyzed Sonogashira coupling reaction with 9,10-diethynylanthracene and 2,7-diiodo-9,9-didodecyl-fluorene. The obtained polymer is confirmed by FTIR, 1 H-NMR, 13 C-NMR and elemental analysis. The PDADF had very good solubility in organic solvents such as chloroform and had a weight average molecular weight of 29,300 with a polydispersity index of 1.29. The PL maximum of the polymer was found at 533 and 568 nm for a solution and 608 nm for film, respectively. The highest occupied molecular orbital (HOMO) energy of the polymer is À5.62 eV as measured via cyclic voltammetry (CV). A solutionprocessed thin film transistor device showed a carrier mobility value of 6.0 Â 10 À4 cm 2 /Vs with a threshold voltage of À17 V and a capacitance (C i ) of 10 nF/cm 2 . The out-of-plane and in-plane GIXD pattern of spin-coated polymer on SiO 2 dielectric surfaces showed an amorphous halo near 2h ¼ 20 . V

A new orange emitters consisting of 2-naphthalene-1-yl-benzo[de]isoquinoline-1, 3-dione (NBID) as core, and bulky diphenylamine or naphthylphenylamine substituted as a side units were synthesized and characterized. These compounds have a non-planar molecule conformation, donor-acceptor structure, and high thermal stability. Using these materials as dopant, we fabricated electroluminescence device with a structure of ITO=DNTPD=NPD=NBID-1, 2 (3 wt% in Alq 3 )=Alq 3 = LiF=Al. The luminance-efficiency of NBID derivatives (1 and 2) were showed 6.6 cd=A and 5.9 cd=A, respectively. The orange emissions were observed with Commission International de I'Eclairage (CIE) coordinates of (0.46, 0.52) for NBID-1 and (0.48, 0.52) for NBID-2, respectively.

New efficient red emitter having short π-conjugation length and asymmetric bulky structure, 2-(7-diphenylamino-benzo[1,2,5]thiadiazole-4-ylmethylene)-malononitrile, was synthesized and characterized. Using this material as a dopant, we fabricated electroluminescence device with a structure of ITO/DNTPD/ NPD/BTZA (5 wt% in Alq 3 )/Alq 3 /LiF/Al. The device exhibited a high brightness of 761 cd/m 2 at a driving voltage of 4.8 V, and current efficiency is 0.75 cd/A. The Commission International de I'Eclairage (CIE) coordinates of the EL device were found to be (0.62, 0.37) at 10 mA/cm 2 .