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<P>Image mosaicking is essential for monitoring a wide target area using unmanned aircraft vehicle (UAV) images. An image mosaicking process requires accurate and robust geometric correction of individual images with respect to the reference plane. Tiepoint-based geometric correction methods developed so far usually assume wide overlaps between adjacent images. This article focuses on fast monitoring applications where UAVs fly very fast and image mosaics are to be generated immediately. In this case, wide overlaps might not be ensured. For this reason, we investigate a fast and robust geometric correction method for mosaicking UAV images with narrow overlaps. To ensure quickness in geometric correction, an image resampling approach using a resampling grid is presented. To ensure accuracy and robustness in geometric correction, existing transformation models are analysed in depth, and optimal models are proposed. Our proposed method shows the potential for fast monitoring applications. We also show that while existing transformation models work for images with a large overlap, perspective transformation models with full orientation parameters may suffer in images with a narrow overlap. We hope that our results can be useful when implementing an optimal solution that can simultaneously handle UAV images with different overlaps.</P>
<P>2,6-pyridinedimethanol (Py-diOH) is applied to the cathode interlayer in inverted polymer solar cells (PSCs) based on the blend of PTB7:PC71BM. A layer of Py-diOH generates a favorable interface dipole at the cathode interface. The power conversion efficiency of the devices with the interlayer reaches up to 7.44% with a J(sc) of 14.65 mA/cm(2), a V-oc of 0.71V, and a FF of 67.9%, respectively The PCE of the device with Py-2OH is very similar to that of the device with ZnO as the electron collection layer. It is possible to obtain high efficiency PSCs without any high temperature heat treatment.</P>
<P>The utilization of cationic iridium complexes in light-emitting electrochemical cells (LECs) have drawn remarkable attention over other metal complexes, because of their large ligand-field splitting energies (LFSEs). Herein, we report two new cationic iridium complexes using phenanthroimidazole derivatives as ancillary ligand, namely, [Ir(ppy)(2)(ptpphim)]PF6 (complex 1) and [Ir(meppy) 2 (ptpphim)] PF6 (complex 2). The photoluminescence (PL) emission spectra in acetonitrile solution show yellow emission for complex 1 (540 nm) and complex 2 (561 nm). LECs were fabricated and emitted yellow light with the CIE coordinates of (0.46, 0.52) and (0.49, 0.50) for complex 1 and 2, respectively. Complex 1 shows the higher current efficiency of 0.56 cd A(-1) than complex 1 (0.26 cd A(-1)) due to the lower current current density of the former. The use of phenanthroimidazole with a bulky tetraphenyl methane group reduce the intermolecular interactions between the iridium complexes, thereby enhancing device performances.</P>
<P>Two double branched organic dyes (T1I and T2I) were synthesized, characterized, and employed as photosensitizers in p-type dye-sensitized solar cells (p-DSSC); we have compared with corresponding single branched dye (TC1) and reference dye P1. The absorbance of the dyes in solution was red shifted and the oxidation potential gradually decreased with increasing the donating ability. It was found that modification from single branched (TC1) to double branched (T1I and T2I) system resulted in increased photocurrent density leading to the higher photovoltaic performances. The charge transporting ability is increased with the introduction of double branching, as evidenced from electrochemical impedance analysis.</P>
<P>Photovoltaic organic light-emitting diodes (PVOLEDs) that generate both light and electricity were fabricated using a tandem structure consisting of an organic light-emitting diode (OLED) part and an organic solar cell (OSC) part. A semitransparent Al/Ag double-layer intermediate electrode was used to connect the OSC part and the OLED part in the tandem structure. The performance of the PVOLED was comparable with the light- and electricity-generating functions of the single OLED and OSC. As an electricity-generating device, the PVOLED had a 4.5-mA/cm(2) short-circuit current density, 64% fill factor, 2.3% power conversion efficiency, and 0.85-V open-circuit voltage. As a light-generating device, the PVOLED produced 4700-cd/m(2) luminescence at 13.5V, and had a current efficiency of 1.4 cd/A.</P>
<P>To develop efficient blue emitters, we synthesized a series of 9,9-diethyl-N,N-diphenyl-9H-fluoren-2-amine derivatives end-capped with various aromatics using Suzuki coupling reaction and Buchwald-Hartwig amination. To investigate their electroluminescent properties, multilayer devices were fabricated in following structures: Indium-tin-oxide (ITO) (180 nm)/N, N'-diphenyl-N,N'-(1-napthyl)-(1,1'-phenyl)-4,4' -diamine (NPB) (50 nm)/blue emitters (30 nm)/bathophenanthroline (Bphen) (30 nm)/8-hydroxyquinolatolithium (Liq) (2 nm)/Al (100 nm). All devices showed the blue emissions. Particularly, a device using 9,9-diethyl-7-(10-(10-(naphthalen-2-yl) anthracen-9-yl) anthracen-9-yl)N, N-diphenyl-9H-fluoren-2-amine showed the efficient blue emission with 5.12 cd/A, 2.33 lm/W, and 3.94% of a luminous, power, and external quantum efficiency at 20 mA/cm(2), respectively and CIE (x,y) coordinates of (0.15, 0.15) at 6.0 V.</P>