A novel poly(azomethine) (PAM) thin film deposited by vapor deposition polymerization (VDP) process was used in the emissive layer of polymer light-emitting diodes (PLEDs). 1,4-Bis(4-formylstyryl)benzene (BFSB) and 4,4 00 -diamino-(1,1 0 ,4 0 ,1 00 )-terphenyl (DAT) were co-deposited to form PAM thin films at various substrate temperatures. Fluorescent quantum yield of novel PAM synthesized by using BFSB monomer increased one order of magnitude compared with the previous report. PLEDs with the device structure of indium-tin oxide (ITO)/poly(3,4-ethylene dioxythiophene) doped with poly(styrene sulfonic acid) (PEDOT:PSS) (100 nm)/PAM (140 nm)/LiF (0.5 nm)/Al (80 nm) exhibited of electroluminescence from the PAM layer for the first time. The characteristics of PLEDs suggest the electron mobility of PAM is higher than hole mobility.
The adsorption of 4,4′′-diamino-p-terphenyl (DAT) on Si(111)-7 × 7 at room temperature (RT) is examined using X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). At low coverages of DAT, the XPS peak from N(1s) in two amino groups of a DAT is decomposed into two peaks with almost the same intensity, corresponding to the binding state of a N atom in Si-NH-terphenyl and to that in NH2-terphenyl, respectively. This indicates that the DAT is chemically bonded to the Si surface even at RT through one amino group at one end of the DAT, and the other amino group at the other end is intact. In empty-state STM images, round protrusions of ∼0.3 nm high are found over center Si adatom sites, possibly attributed to the binding site of DAT. The positions of some protrusions in the empty-state STM images slightly shift in the filled-state images. To compare the empty and the filled-state STM images, we propose a model for the DAT aslant bound to the Si surface through an amino group at the one end of DAT with a preferential orientation within the half cell of 7 × 7.
SUMMARYWe have fabricated an optical polymer waveguide using plasm-enhanced polymerization. C 6 H 6 and C 6 H 10 are used as monomer materials for depositing core and cladding layer, respectively, because the refractive index of polymerized layers is known to dominantly depend on the ratio of sp 2 and sp 3 bond in those. By decreasing RF power below 0.04 W/cm 2 , dangling bonds formed in a polymer film will be suppressed, so that a relatively low-loss waveguide has been fabricated. We measured propagation loss of those waveguides using the end-fire method employing laser light at a wavelength of 787 nm. The losses are 3.2 cm -1 for the samples plasma-polymerized in Ar.
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