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RISS 인기검색어
- 검색키워드
- 저자 : Dongbo Xu (검색결과 5 건)
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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.
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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.
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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.
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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%.
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Chunyun Hou,Jiangwei Yu,Jin-Rui Ding,Weiqiang Fan,Hongye Bai,Dongbo Xu,Wei-dong Shi 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
The unsatisfactory solar light absorption of WO3 and poor charge separation of BiVO4 are main limits fortheir use in photoelectrochemical (PEC) water oxidation. Coupling WO3 with BiVO4 has been consideredas a feasible way to improve PEC performance by taking complementary advantages of them. In thiswork, we obtained nanoflake-structured WO3 by hydrothermal growth with post-annealing. The effectof process variables on morphology and resultant performance were investigated. Electrodepositiongrowth was utilized to deposit BiVO4 onto WO3 forming WO3/BiVO4 heterojunction thin films. PorousBiVO4 with wormlike morphology was tightly coupled and well-distributed onto WO3 nanoflakes. Theoptimized best-performing WO3/BiVO4 photoanode exhibits higher photocurrent density than that summationof bare WO3 and BiVO4 over entire range of applied potential. This enhancement is mainly attributedto the effective charge separation at WO3/BiVO4 interface, which is confirmed throughelectrochemical impedance spectra (EIS) measurements, respectively. Our work provides a referableapproach for the growth of WO3/BiVO4 heterojunction photoanode with enhanced PEC performance.
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