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🏛️國立陽明交通大學機構典藏

Access type: Open accessAuthor: search.filters.author.Wang, Yu

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Now showing 1 - 8 of 8
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    Bis(diphenylamino)-9,9 '-spirobifluorene functionalized Ir(III) complex: a conceptual design en route to a three-in-one system possessing emitting core and electron and hole transport peripherals
    (2011)
    Chen, Hsiao-Fan
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    Wong, Ken-Tsung
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    Liu, Yi-Hung
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    Wang, Yu
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    Cheng, Yi-Ming
    Conceptual design of a three-in-one (luminescence chromophore with electron and hole transports) system was demonstrated by a functionalized Ir(III) complex 3, in which 4,5-diazafluorene and bis(diphenylamino) serve as electron and hole transporting sites, respectively. The poor emission quantum yield of 3 was systematically examined via a series of photophysical studies in combination with theoretical approaches. The far lifting of the pi-electron from -NPh(2) renders virtually no (3)MLCT contribution to the lowest transition in the triplet manifold as compared with that of the parent model 2 without amino substituents. With an empirical approach, we conclude that an energy gap law may account for the major deactivation process. A light-emitting electrochemical cell (LEC) device based on 3 shows peak EQE, peak current efficiency and peak power efficiency at 2.4 V of 0.020%, 0.013 cd A(-1) and 0.017 lm/W, respectively. The low device efficiencies are in accordance with the low PL quantum yield, stemming from the ligand-centered radiationless deactivation. The conceptual design presented here should provide valuable information for future progress en route to an ideal three-in-one system suited for OLEDs.
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    Theory-Guided Experiments on the Mechanistic Elucidation of the Reduction of Dinuclear Zinc, Manganese, and Cadmium Complexes
    (2011)
    Lu, Duan-Yen
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    Yu, Jen-Shiang K.
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    Kuo, Ting-Shen
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    Lee, Gene-Hsiang
    ;
    Wang, Yu
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    Three-dimensional greedy routing in large-scale random wireless sensor networks
    (2013-06-01)
    Wang, Yu
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    Yi, Chih-Wei
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    Huang, Minsu
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    Li, Fan
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    資訊工程學系
    In this paper, we investigate how to design greedy routing to achieve sustainable and scalable in a large-scale three-dimensional (3D) sensor network. Several 3D position-based routing protocols were proposed to seek either delivery guarantee or energy-efficiency in 3D wireless networks. However, recent results [1,2] showed that there is no deterministic localized routing algorithm that guarantees either delivery of packets or energy-efficiency of its routes in 3D networks. In this paper, we focus on design of 3D greedy routing protocols which can guarantee delivery of packets and/or energy-efficiency of their paths with high probability in a randomly deployed 3D sensor network. In particular, we first study the asymptotic critical transmission radius for 3D greedy routing to ensure the packet delivery in large-scale random 3D sensor networks, then propose a refined 3D greedy routing protocol to achieve energy-efficiency of its paths with high probability. We also conduct extensive simulations to confirm our theoretical results. (c) 2010 Elsevier B.V. All rights reserved.
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    Stepwise Construction of the Cr-Cr Quintuple Bond and Its Destruction upon Axial Coordination
    (2012)
    Huang, Yu-Lun
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    Lu, Duan-Yen
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    Yu, Hsien-Cheng
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    Yu, Jen-Shiang K.
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    Hsu, Chia-Wei
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    Quintuply-Bonded Dichromium(I) Complexes Featuring Metal-Metal Bond Lengths of 1.74 angstrom
    (2008)
    Hsu, Chia-Wei
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    Yu, Jen-Shiang K.
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    Yen, Chun-Hsu
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    Lee, Gene-Hsiang
    ;
    Wang, Yu
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    Remarkably short metal-metal bonds: A lantern-type quintuply bonded Dichromium(I) complex
    (2008)
    Tsai, Yi-Chou
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    Hsu, Chia-Wei
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    Yu, Jen-Shiang K.
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    Lee, Gene-Hsiang
    ;
    Wang, Yu
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    Resonant X-Ray Scattering and Absorption for the Global and Local Structures of Cu-modified Metallothioneins in Solution
    (2009-07-22)
    Li, Meiyi
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    Huang, Yu-Shan
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    Jeng, U-Ser
    ;
    Hsu, I-Jui
    ;
    Wu, YewChung Sermon
    With Cd and Zn metal ions removed from the native rabbit-liver metallothionein upon unfolding, Cu-modified metallothioneins (Cu-MTs) were obtained during refolding in solutions containing Cu(I) or Cu(II) ions. X-ray absorption near-edge spectroscopic results confirm the respectively assigned oxidation states of the copper ions in Cu(I)-MT and Cu(II)-MT. Global and local structures of the Cu-MTs were subsequently characterized by anomalous small-angle x-ray scattering (ASAXS) and extended x-ray absorption fine structure. Energy-dependent ASAXS results indicate that the morphology of Cu(II)-MT resembles that of the native MT, whereas Cu(I)-MT forms oligomers with a higher copper content. Both dummy-residue simulation and model-shape fitting of the ASAXS data reveal consistently rodlike morphology for Cu(II)-MT. Clearly identified Cu-S, Cu-O, and Cu-Cu contributions in the extended x-ray absorption fine structure analysis indicate that both Cu(I) and Cu(II) ions are bonded with O and S atoms of nearby amino acids in a four-coordination environment, forming metal clusters smaller than metal thiolate clusters in the native MT. It is demonstrated that a combination of resonant x-ray scattering and x-ray absorption can be particularly useful in revealing complementary global and local structures of metalloproteins due to the atom specific characteristics of the two techniques.
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    Journey from Mo-Mo Quadruple Bonds to Quintuple Bonds
    (2009-09-09)
    Tsai, Yi-Chou
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    Chen, Hong-Zhang
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    Chang, Chie-Chieh
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    Yu, Jen-Shiang K.
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    Lee, Gene-Hsiang
    Heating K(4)Mo(2)Cl(8) and 2 equiv of Li[RC(NDipp)(2)] (R = H, Ph; Dipp = 2,6-i-Pr(2)C(6)H(3)) in tetrahydrofuran (THF) at 60 degrees C gives two paddlewheel type quadruply bonded dimolybdenum complexes, Mo(2)(mu-Cl)[Cl(2)Li(OEt(2))][mu-eta(2)-RC(N-2,6-i-Pr(2)C(6)H(3))(2)](2) (R = H (1), Ph (2)). The Mo-Mo bond lengths of 1 and 2 are 2.0875(4) and 2.0756(8) angstrom, respectively, indicating typical Mo-Mo quadruple bonds. Reduction of 1 and 2 by two electrons results in the isolation of their corresponding Mo-Mo quintuple bonded complexes, Mo(2)[mu-eta(2)-RC(N-2,6-i-Pr(2)C(6)H(3))(2)](2) (R = H (3), Ph (4)), and the Mo-Mo bond lengths dramatically decrease to 2.0187(9) angstrom (3) and 2.0157(4) angstrom (4), a consequence of the formation of the second delta bond and representing the shortest metal-metal bonds beyond the first row elements. The Mo-Mo quintuple bonding characters are corroborated by DFT calculations at the level of BP86/def2-TZVP and BP86/def2-TZVPP.