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Mi, Dongbo,Park, Jong Baek,Xu, Fei,Kim, Hee Un,Kim, Ji-Hoon,Hwang, Do-Hoon Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.6
9,10-Bis(bromomethyl)phenanthrene reacted with fullerenes via a Diels-Alder reaction to give phenanthrene-substituted fullerene mono-adducts (PCMA) and bis-adducts (PCBA) as electron acceptors for organic photovoltaic cells (OPVs). The syntheses of the fullerene derivatives were confirmed by $^1H$ $^{13}C$ NMR spectroscopy and MALDI-TOF mass spectrometry. PCMA and PCBA showed better light absorption in the UV-visible region than $PC_{61}BM$. Their electrochemical properties were measured using cyclic voltammetry. Accordingly, the lowest unoccupied molecular orbital (LUMO) energy levels of PCMA and PCBA were -3.66 and -3.57 eV, respectively. Photovoltaic cells were fabricated with a ITO/PEDOT:PSS/poly(3-hexylthiophene)(P3HT):acceptor/LiF/Al configuration, where P3HT and PCBA are the electron donors and acceptors, respectively. The polymer solar cell fabricated using the P3HT:PCBA active layer showed a maximum power conversion efficiency of 0.71%.
Mi, Dongbo,Hwang, Do-Hoon American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.5
<P>Currently, [60] fullerene derivatives are the focus of considerable research due to their important roles in many fields, especially material science. In this study, we synthesized the following two novel fulleropyrrolidine derivatives: C60-fused N-methyl-(4-hexyloxybenzen-2-yl) pyrrolidine, (p-HOPF) and C60-fused N-methyl-(2-hexyloxybenzen-2-yl) pyrrolidine, (o-HOPF). Structural assignments of the two fullerene derivatives were made through 1H NMR and FAB-MS. We also measured the optical and electrochemical properties of p-HOPF and o-HOPF through UV/Vis spectrophotometry and cyclic voltammetry. We found that the difference in the position of the alkoxyl substituent on the phenyl ring greatly affects the characteristics of the molecules. In particular, from the 1H NMR spectrum, we found that the hydrogen atoms on the carbons adjacent to the oxygens in p-HOPF and o-HOPF have completely different chemical environments. In order to study the effects of the substituent group positions on photovoltaic performance, photovoltaic devices were fabricated. The highest power conversion efficiency, 0.71%, was achieved when using o-HOPF as the electron acceptor.</P>
Dongbo Mi,Jinhaojie Cui,Siliang Kuang,Xiaofeng Dong,Haiyan Lu 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.3
Water radical cations, (H2O)n+?, have attracted considerable attention owing to their potential practical applications in analytical chemistry, structural chemistry, radiotherapy, and radiochemistry. Recently, atmospheric pressure chemical ionization has emerged as a versatile method for direct mass spectrometric analysis. Usually, H3O+ is the major proton donor during ionization and only the pseudo molecular ion peaks, instead of molecular ions are detected. In this work, (H2O)2+? ions with high oxidizability and reactivity were generated using hydrothermally grown TiO2 nanoneedle arrays in combination with a linear ion trap mass spectrometer under low operating voltage and applied to the direct mass spectrometric analysis of a mixture of volatile aromatic hydrocarbons. (H2O)2+? ions were generated with a high absolute ion current of up to 1.07???105?counts/s at atmospheric pressure. Using the generated (H2O)2+? as the primary ion permitted the tandem mass spectrometric analysis of a mixed vapor sample of aromatic hydrocarbons.
Fei Xu,Dongbo Mi,Hong Ryeol Bae,서민철,윤웅찬,황도훈 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
A series of fluorene-carbazole copolymers containing the pendant phosphor chromophore Ir(absn)2(acac) (absn: 2-(1-naphthyl)benzothiazole; acac: acetylacetone) were designed and synthesized via Yamamoto coupling. In the film state, these copolymers exhibited absorption and emission peaks at approximately 389 and 426 nm, respectively, which originated from the fluorene backbone. However, in electroluminescent (EL) devices, a significantly red-shifted emission at approximately 611 nm was observed, which was attributed to the pendant iridium(III) complex. Using these copolymers as a single emission layer, polymer light-emitting devices with ITO/PEDOT:PSS/polymer:DNTPD/TmPyPb/LiF/Al configurations exhibited a saturated red emission at 611 nm. The attached iridium(III) complex had a significant effect on the EL performance. A maximum luminous efficiency of 0.85 cd/A, maximum external quantum efficiency of 0.77, maximum power efficiency of 0.48 lm/W, and maximum luminance of 883 cd/m2 were achieved from a device fabricated with the copolymer containing the iridium(III) complex in a 2% molar ratio.
Xu, Fei,Mi, Dongbo,Bae, Hong Ryeol,Suh, Min Chul,Yoon, Ung Chan,Hwang, Do-Hoon Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
A series of fluorene-carbazole copolymers containing the pendant phosphor chromophore $Ir(absn)_2(acac)$ (absn: 2-(1-naphthyl)benzothiazole; acac: acetylacetone) were designed and synthesized via Yamamoto coupling. In the film state, these copolymers exhibited absorption and emission peaks at approximately 389 and 426 nm, respectively, which originated from the fluorene backbone. However, in electroluminescent (EL) devices, a significantly red-shifted emission at approximately 611 nm was observed, which was attributed to the pendant iridium(III) complex. Using these copolymers as a single emission layer, polymer light-emitting devices with ITO/PEDOT:PSS/polymer:DNTPD/TmPyPb/LiF/Al configurations exhibited a saturated red emission at 611 nm. The attached iridium(III) complex had a significant effect on the EL performance. A maximum luminous efficiency of 0.85 cd/A, maximum external quantum efficiency of 0.77, maximum power efficiency of 0.48 lm/W, and maximum luminance of 883 $cd/m^2$ were achieved from a device fabricated with the copolymer containing the iridium(III) complex in a 2% molar ratio.
Eom, Jae-Hoon,Mi, Dongbo,Park, Moo-Jin,Cho, Hoon-Je,Lee, Jonghee,Lee, Jeong-Ik,Chu, Hye Yong,Shim, Hong-Ku,Hwang, Do-Hoon American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.12
<P>A polyhedral oligomeric silsesquioxane (POSS)-based electroluminescent nanoparticle, POSS-NPA, which contains anthracenenaphthyl chromophores on each of its eight arms, was easily prepared via the hydrosilylation reaction between octakis(dimethylsiloxy)silsesquioxane and allyl-functionalized 9-naphthalene-2-yl-10-phenyl anthracene chromophores. POSS-NPA was completely soluble in common organic solvents such as chloroform, THF, toluene, p-xylene, and chlorobenzene, and showed good film-forming properties on a quartz plate or an indium tin oxide (ITO) plate, i.e., it has good solution processing properties. The UV-visible absorption and the photoluminescence (PL) emission maxima of POSS-NPA in chlorobenzene solution were found to be 378 nm and 433 nm while those of POSS-NPA in the solid state were 379 and 464 nm, respectively. An electroluminescent (EL) device with the configuration of ITO/PEDOT:PSS/POSS-NPA (50 nm)/BAIq (40 nm)/LiF (1 nm)/Al (120 nm) was also fabricated and the blue light emission was successfully obtained.</P>
Synthesis and Characterization of Iridium-Containing Green Phosphorescent Polymers for PLEDs
Xu, Fei,Kim, Hee Un,Mi, Dongbo,Lim, Jong Min,Hwang, Ju Hyun,Cho, Nam Sung,Lee, Jeong-Ik,Hwang, Do-Hoon Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.2
Two series of new green phosphorescent polymers bearing a bis(2-phenyl-pyridine)iridium(III)(dibenzoylmethane) [$(ppy)_2Irdbm$] complex were designed and synthesized. Poly-carbazole (PCbz) derivative or polyfluorene with pendant carbazole groups (PFCbz) were employed as host polymers for the iridium complex. The iridium complex monomer was copolymerized with the host monomers using varying monomer ratios via a Yamamoto coupling reaction. Efficient energy transfer from host to dopant unit was observed by increasing the ratio of the iridium guest in the copolymers. Electroluminescent devices with the configuration ITO/PEDOT:PSS/polymer/BmPyPB/LiF/Al were fabricated and characterized. The phosphorescent polymers composed of the iridium complex guest and polyfluorene with carbazole pendants as a host performed better than the polymers composed of the same guest and the main chain polycarbazole host. A maximum external quantum efficiency of 0.73%, a luminous efficiency of 1.21 cd/A, and a maximum luminance of 372 $cd/m^2$ were obtained from a device fabricated using one of the synthesized copolymers.
Kim, Ji-Hoon,Kim, Hee Un,Mi, Dongbo,Jin, Sung-Ho,Shin, Won Suk,Yoon, Sung Cheol,Kang, In-Nam,Hwang, Do-Hoon American ChemicalSociety 2012 Macromolecules Vol.45 No.5
<P>A series of semiconducting copolymers, poly[2,7-(9,9′-dioctylfluorene)-<I>alt</I>-5,5′-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)](PFDTBT), poly[2,2′-(9,9-dioctyl-9<I>H</I>-fluorene-2,7-diyl)dithiophene-<I>alt</I>-5,5′-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)](PFD2TBT), and their <I>ter</I>-polymers containing peryleneunits were synthesized using Suzuki coupling polymerization. The peryleneunits were introduced to improve the charge-transport ability by enhancingthe π–π interaction between polymer chains. Theresulting polymers were characterized by <SUP>1</SUP>H NMR, elementalanalysis, DSC, and TGA. The synthesized polymers were soluble in commonorganic solvents, and formed smooth and uniform spin-coated thin films.All of the polymers studied were found to exhibit good thermal stability,losing less than 5% of their weight upon heating to approximately350 °C. Perylene- containing polymers showed higher field-effectmobilities than the corresponding PFDTBT or PFD2TBT polymers becauseof the enhanced π–π interaction between polymerchains upon the introduction of perylene units. Bulk heterojunctionsolar cells were fabricated with configuration of ITO/PEDOT:PSS/polymer:PC<SUB>71</SUB>BM/TiO<SUB><I>x</I></SUB>/Al. The devices usingthe perylene-containing polymers showed higher short-circuit currents,and fill factors than the corresponding PFDTBT or PFD2TBT devices.One of the fabricated devices using a perylene-containing copolymershowed a maximum power conversion efficiency of 3.16%, with a shortcircuit current density of 9.61 mA/cm<SUP>2</SUP>, open circuit voltageof 0.81 V, and fill factor of 41%.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2012/mamobx.2012.45.issue-5/ma202712r/production/images/medium/ma-2011-02712r_0013.gif'></P>