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Hwang, Jun Yeon,Shim, Sangdeok,Hwang, Gil Tae Wiley (John WileySons) 2018 ASIAN JOURNAL OF ORGANIC CHEMISTRY Vol.7 No.1
<P>4',5'-Diaminofluoresein (DAF) and 4',5'-bis(dimethylamino)fluorescein (BDMAF) have been synthesized and their pH-dependent photophysical properties and protolytic equilibria investigated. Although the parent fluorescein exhibits decreased emission upon decreasing pH, DAF displayed quenched emission at all pH values; surprisingly, BDMAF exhibited strong fluorescence only at pH 3-6, with its emission almost completely quenched under strongly acidic, neutral, and basic conditions.</P>
Kim, Youngmin,Lee, Seungjae,Lee, Kyungjun,Shim, Sangdeok,Kim, Jin Young,Lee, Hyung Woo,Choi, Dukhyun American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.22
<P>This study details the development of a large-area, three-dimensional (3D), plasmonic integrated electrode (PIE) system. Vertically aligned multiwalled carbon nanotube (VA-MWNT) electrodes are grown and populated with self-assembling silver nanoparticles via thermal evaporation. Due to the geometric and surface characteristics of VA-MWNTs, evaporated silver atoms form nanoparticles approximately 15–20 nm in diameter. The nanoparticles are well distributed on VA-MWNTs, with a 5–10 nm gap between particles. The size and gap of the self-assembled plasmonic nanoparticles is dependent upon both the length of the MWNT and the thickness of the evaporated silver. The wetting properties of water of the VA-MWNT electrodes change from hydrophilic (∼70°) to hydrophobic (∼120°) as a result of the evaporated silver. This effect is particularly pronounced on the VA-MWNT electrodes with a length of 1 μm, where the contact angle is altered from an initial 8° to 124°. Based on UV–visible spectroscopic analysis, plasmonic resonance of the PIE systems occurs at a wavelength of approximately 400 nm. The optical behavior was found to vary as a function of MWNT length, with the exception of MWNT with a length of 1 μm. Using our PIE systems, we were able to obtain clear surface-enhanced Raman scattering (SERS) spectra with a detection limit of ∼10 nM and an enhancement factor of ∼10<SUP>6</SUP>. This PIE system shows promise for use as a novel electrode system in next-generation optoelectronics such as photovoltaics, light-emitting diodes, and solar water splitting.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-22/am505999e/production/images/medium/am-2014-05999e_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am505999e'>ACS Electronic Supporting Info</A></P>
Controlled transparency and wettability of large-area nanoporous anodized alumina on glass
Lee, Seungwoo,Kim, Wook,Lee, Sangmin,Shim, Sangdeok,Choi, Dukhyun Elsevier 2015 Scripta materialia Vol.104 No.-
<P>Here, we investigate the morphological and optical properties of nanoporous anodized alumina (NAA) on a glass wafer for anodizing times from 60 to 120s and widening times from 0 to 80min. Furthermore, we explore the corresponding wetting properties. Finally, we demonstrate a highly transparent superhydrophobic surface by using organic molecule-treated NAA on glass. Successful development of large-area NAA with tunable transparency and wettability opens up opportunities for self-cleaning and anti-frost glass for use on skyscrapers or in vehicles.</P>
Prabakar, S. J. Richard,Hwang, Yun‐,Hwa,Bae, Eun‐,Gyoung,Shim, Sangdeok,Kim, Dongwook,Lah, Myoung Soo,Sohn, Kee‐,Sun,Pyo, Myoungho WILEY‐VCH Verlag 2013 Advanced Materials Vol.25 No.24
<P><B>An alternating stack (SG/GN) consisting of SnO<SUB>2</SUB>‐functionalized graphene oxide (SG) and amine‐functionalized GO (GN) is prepared in solution</B>. The thermally reduced SG/GN (r(SG/GN)) with decreased micro‐mesopores and completely eliminated macropores, results in a high reversible capacity and excellent capacity retention (872 mA h g<SUP>−1</SUP> after 200 cycles at 100 mA g<SUP>−1</SUP>) when compared to a composite without GN.</P>
Manandhar, Prakash,Vokatá,, Tereza,Lee, Sunyoung,Lee, Yejin,Jung, Hyun Min,Shim, Sangdeok,Moon, Joong Ho John Wiley Sons, Ltd 2018 Polymer international Vol.67 No.12
<P><B>Abstract</B></P><P>Understanding the role of the polymer backbone structure on the aggregation of conjugated polymers in an aqueous environment is of prime interest as the physical, photophysical and biophysical properties required for many applications are closely related to the nature of aggregation structures. We report unique and ordered aggregation behaviours of four positively charged conjugated polymers, which differ in backbone chemical structure and connectivity, upon complexation with a linear polyanion hyaluronic acid. Opposite signals of induced circular dichroism were observed from achiral poly(phenyleneethynylene) (PPE) and flexible linker containing poly(phenylenebutadiynylene) (PPB) with the same side chain structure, implying the formation of highly ordered ionic complexes. The intrinsic difference in the interpolymer interaction between PPE and PPB is probably the contributing factor for different aggregation structures upon complexation with hyaluronic acid. The structure–property relationship can be useful to design and fabricate highly ordered macromolecular materials exhibiting unique electrical, photophysical or biophysical properties. © 2018 Society of Chemical Industry</P>
Effective thermally activated delayed fluorescence emitter and its performance in OLED device
Park, Woo Jae,Lee, Yosup,Kim, Jun Yun,Yoon, Dae Wi,Kim, Jinook,Chae, Seung Hyun,Kim, Hyojeong,Lee, Gahyeon,Shim, Sangdeok,Yang, Joong Hwan,Lee, Suk Joong Elsevier 2015 Synthetic metals Vol.209 No.-
<P><B>Abstract</B></P> <P>Dicyanophenyl derivatives, <B>DCN1</B>–<B>3</B>, were rationally synthesized and their thermally activated delayed fluorescence properties were investigated. OLED devices were further fabricated using <B>DCN1</B>–<B>3</B>. Particularly <B>DCN3</B> (5-{3,6-di(9<I>H</I>-carbazole-9-yl)-9<I>H-</I>carbazol-9-yl}isophthalonitrile) showed excellent device performances employing TADF mechanism with power efficiency of 15.26Cd/A, luminous efficiency of 8.14lm/W, the maximum external quantum efficiency of 13.33%, and brightness of 1526Cd/m<SUP>2</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A series of carbazole containing DCN were synthesized as potential OLED dopants. </LI> <LI> <B>DCN3</B> displayed a clear delayed fluorescence component with a lifetime of 3.26μs. </LI> <LI> A twisted structure between donor and acceptor may facilitate a long lifetime. </LI> <LI> OLED device of <B>DCN3</B> showed excellent device performances with PE of 15.26Cd/A. </LI> <LI> It shows the maximum EQE of 13.33%, and brightness of 1526Cd/m<SUP>2</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>