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Articles 31 - 60 of 149
Full-Text Articles in Engineering
A Porphyrin--Fullerene Dyad With A Supramolecular Double-Cable Structure As A Novel Electron Acceptor For Bulk Heterojunction Polymer Solar Cells, Chien-Lung Wang, Wen-Bin Zhang, Ryan Van Horn, Yingfeng Tu, Xiong Gong, Stephen Cheng, Yanming Sun, Minghong Tong, Junghwa Seo, Ben Hsu, Alan Heeger
A Porphyrin--Fullerene Dyad With A Supramolecular Double-Cable Structure As A Novel Electron Acceptor For Bulk Heterojunction Polymer Solar Cells, Chien-Lung Wang, Wen-Bin Zhang, Ryan Van Horn, Yingfeng Tu, Xiong Gong, Stephen Cheng, Yanming Sun, Minghong Tong, Junghwa Seo, Ben Hsu, Alan Heeger
Xiong Gong
With a supramolecular “double-cable” structure in the solid state, a light harvesting porphyrin-fullerene dyad is demonstrated to be a promising candidate for new electron acceptors in high-performance bulk heterojunction (BHJ) polymer solar cells (PSCs). It has long-lived mobile carriers, a high short circuit current, and a large open circuit voltage.
Organic Photoresponse Materials And Devices, Huanli Dong, Hongfei Zhu, Qing Meng, Xiong Gong, Wenping Hu
Organic Photoresponse Materials And Devices, Huanli Dong, Hongfei Zhu, Qing Meng, Xiong Gong, Wenping Hu
Xiong Gong
Organic photoresponse materials and devices are critically important to organic optoelectronics and energy crises. The activities of photoresponse in organic materials can be summarized in three effects, photoconductive, photovoltaic and optical memory effects. Correspondingly, devices based on the three effects can be divided into (i) photoconductive devices such as photodetectors, photoreceptors, photoswitches and phototransistors, (ii) photovoltaic devices such as organic solar cells, and (iii) optical data storage devices. It is expected that this systematic analysis of photoresponse materials and devices could be a guide for the better understanding of structure–property relationships of organic materials and provide key clues for the …
Solution-Processed Zinc Oxide Thin Film As A Buffer Layer For Polymer Solar Cells With An Inverted Device Structure, Xiong Gong
Xiong Gong
A solution-processed zinc oxide (ZnO) thin film as a buffer layer for polymer solar cells (PSCs) with an inverted device structure has been demonstrated. A power conversion efficiency (PCE) of 3.8% was observed from an inverted device structure with the ZnO buffer layer. Without the ZnO layer, PSCs only show a PCE of 1.67%, which is less than half the value observed from PSCs with the ZnO buffer layer. When operated at room temperature, no obvious degradation was observed from the PSCs with the ZnO layer after continuously illuminating the devices for 4 h. However, a significant degradation was observed …
Polymer Solar Cells By Novel Electron Acceptor, Xiong Gong
Polymer Solar Cells By Novel Electron Acceptor, Xiong Gong
Xiong Gong
No abstract provided.
On The Binding Of Cationic, Water-Soluble Conjugated Polymers To Dna: Electrostatic And Hydrophobic Interactions, Xiong Gong
Xiong Gong
Water-soluble, cationic conjugated polymer binds single-stranded DNA with higher affinity than it binds double-stranded or otherwise “folded” DNA. This stronger binding results from the greater hydrophobicity of single-stranded DNA. Upon reducing the strength of the hydrophobic interactions, the electrostatic attraction becomes the important interaction that regulates the binding between the water-soluble conjugated polymer and DNA. The different affinities between the cationic conjugated polymer and various forms of DNA (molecular beacons and its open state; single-stranded DNA and double-stranded DNA and single-stranded DNA and complex DNA folds) can be used to design a variety of biosensors.
Electrophosphorescence From A Conjugated Copolymer Doped With An Iridium Complex: High Brightness And Improved Operational Stability, Xiong Gong
Xiong Gong
High efficiency electrophosphorescent light-emitting diodes (LEDs), with an emission peak at 600 nm, a luminance of 2200 cd m–2, and good operational stability were fabricated from a conjugated copolymer doped with an iridium complex. The devices exhibited an external quantum efficiency of 1.5 % and a luminous efficiency of 3 cd A–1. These results demonstrate that electrophosphorescent devices with high brightness and operational stability can be produced in the form of polymer LEDs fabricated by processing the active materials from solution.
Modern Science And Technological English-Chinese Dictionary, Xiong Gong
Modern Science And Technological English-Chinese Dictionary, Xiong Gong
Xiong Gong
No abstract provided.
Temperature Dependence Of Electronic Energy Transfer From A Polymer Host To A Triplet Emitter In Light Emitting Diode Materials, Xiong Gong
Xiong Gong
We investigate the temperature dependence of electronic energy transfer between a polymer host, poly(N-vinylcarbazole) blended with 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole, and the triplet emitter tris[9,9-dihexyl-2-(phenyl-4′-(pyridin-2′′-yl))fluorene] iridium(III) (Ir(DPPF)3). The photophysics of the blend are similar to those of neat poly(N-vinylcarbazole), with two emitting species corresponding to shallow and deep excimer traps. When the blend is doped with Ir(DPPF)3, the deep trap emission is preferentially quenched. This quenching cannot be explained by simple Förster energy transfer to the dopant. Instead, the data are consistent with a rapid, temperature-dependent partitioning of the energy between the two host species and the Ir(DPPF)3, each of which decays independently.
Label-Free, Dual-Analyte Electrochemical Biosensors: A New Class Of Molecular-Electronic Logic Gates, Xiong Gong
Label-Free, Dual-Analyte Electrochemical Biosensors: A New Class Of Molecular-Electronic Logic Gates, Xiong Gong
Xiong Gong
An “XOR” gate built using label-free, dual-analyte electrochemical sensors and the activation of this logic gate via changing concentrations of cocaine and the relevant cDNA as inputs are described.
High-Performance Polymer Light-Emitting Diodes Fabricated With A Polymer Hole Injection Layer, Xiong Gong
High-Performance Polymer Light-Emitting Diodes Fabricated With A Polymer Hole Injection Layer, Xiong Gong
Xiong Gong
Enhanced luminance (L) and luminous efficiency (LE) of polymer light-emitting diodes(PLEDs) is demonstrated using poly(bis(tetraphenyldiamino)biphenyl-perfluorocyclobutane), poly(BTPD-Si-PFCB), as the hole injection layer. The monomer is cast directly onto the indium-tin-oxide anode and thermally polymerized in situ. Hole injection from poly(BTPD-Si-PFCB) into the “super yellow” derivative of poly(phenylene vinylene) and into several blue-emitting polymers is comparable to or better than that from poly(ethylenedioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSSA). With poly(BTPD-Si-PFCB) as the hole injecting layer into “super yellow,” the performance is identical to that obtained with PEDOT:PSSA (LE≈8 cd/A with little fall-off, even at L>104 cd/m2)
High Performance Polymer Electrophosphorescent Leds, Xiong Gong
High Performance Polymer Electrophosphorescent Leds, Xiong Gong
Xiong Gong
No abstract provided.
Photocurrent And Charge Mobility In Ppv Polymers, Xiong Gong
Photocurrent And Charge Mobility In Ppv Polymers, Xiong Gong
Xiong Gong
No abstract provided.
Polymer Solar Cells With An Inverted Device Configuration Using Polyhedral Oligomeric Silsesquioxane-[60] Fullerene Dyad As A Novel Electron Acceptor, Wen-Bin Zhang, Yingfeng Tu, Hao-Jan Sun, Kan Yue, Xiong Gong, Stephen Cheng
Polymer Solar Cells With An Inverted Device Configuration Using Polyhedral Oligomeric Silsesquioxane-[60] Fullerene Dyad As A Novel Electron Acceptor, Wen-Bin Zhang, Yingfeng Tu, Hao-Jan Sun, Kan Yue, Xiong Gong, Stephen Cheng
Xiong Gong
A polyhedral oligomeric silsesquioxane-[60]fullerene (POSS-C60) dyad was designed and used as a novel electron acceptor for bulk heterojunction (BHJ) polymer solar cells (PSCs) with an inverted device configuration. The studies of time-resolved photoinduced absorption of the pristine thin film of poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-(4,7-bis (2-thienyl)-2,1,3-benzothiadiazole)-5,5′-diyl] (SiPCPDTBT) and the composite thin film of SiPCPDTBT:POSS-C60 indicated efficient electron transfer from SiPCPDTBT to POSS-C60 with inhibited back-transfer. BHJ PSCs made by SiPCPDTBT mixed with POSS-C60 yielded the power conversion efficiencies (PCEs) of 1.50%. Under the same operational conditions, PCEs observed from BHJ PSCs made by SiPCPDTBT mixed with [6,6]-phenyl-C61-butyric acid methyl ester were 0.92%. These results …
Colorimetric Detection Of Dna, Small Molecules, Proteins, And Ions Using Unmodified Gold Nanoparticles And Conjugated Polyelectrolytes , Xiong Gong
Xiong Gong
No abstract provided.
Solution-Processed Cross-Linkable Hole Selective Layer For Polymer Solar Cells In The Inverted Structure, Xiong Gong
Solution-Processed Cross-Linkable Hole Selective Layer For Polymer Solar Cells In The Inverted Structure, Xiong Gong
Xiong Gong
Solution-processed cross-linkable tetraphenyldiamine-containing material (TPD-BVB) as a highly efficient hole selective transport layer was demonstrated. Polymersolar cells (PSCs) with an inverted structure fabricated with a thin cross-linked TPD-BVB film show comparable efficiency and superior long-term air stability when compared to devices fabricated with poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). Thus, solution-processed TPD-BVB is an attractive alternative to PEDOT:PSS as a hole extraction layer in inverted structure PSCs.
High-Detectivity Near-Infrared Photodetectors Based On Low Band Gap Polymer Adv. Func. Mater., Xiong Gong
High-Detectivity Near-Infrared Photodetectors Based On Low Band Gap Polymer Adv. Func. Mater., Xiong Gong
Xiong Gong
No abstract provided.
Semiconducting Polymers And Polymer Optoelectronic Devices, Xiong Gong
Semiconducting Polymers And Polymer Optoelectronic Devices, Xiong Gong
Xiong Gong
No abstract provided.
Single Layer White Pleds, Xiong Gong
Polymer Electrophosphorescent Leds, Xiong Gong
Organic Light-Emitting Materials And Devices Viii (Proceedings Volume), Xiong Gong
Organic Light-Emitting Materials And Devices Viii (Proceedings Volume), Xiong Gong
Xiong Gong
No abstract provided.
The Nature Of Excited States In Pvk: Pbd Polymeric Host For Organic Light-Emitting Diodes, Xiong Gong
The Nature Of Excited States In Pvk: Pbd Polymeric Host For Organic Light-Emitting Diodes, Xiong Gong
Xiong Gong
No abstract provided.
Light-Emitting Devices Based On Ruthenium (Ii) Bipyridine Complexes Coupled With Cadmium Sulfide Nanoparticles, Xiong Gong
Xiong Gong
The fabrication of a light-emitting device based on a composite consisting of cadmium sulfide nanoparticle, poly(vinylalcohol), and ruthenium 2,2'-bipyridyl complex is reported. The electroluminescence spectrum of this composite is similar to the combination of the emission from ruthenium complexes and cadmium sulfide. A stable electroluminescence at low threshold voltage (4 V), with a brightness of 680 cd/m2 and an external quantum efficiency of approximately 0.2% was achieved. it was demonstrated that the cadmium sulfide nanoparticles were able to improve the performance of the device and enhance the electron carrier mobility as compared to the device based on pure ruthenium complex.
Conference Paper: Photosensitivity And Light Emitting Properties Of Some Ruthenium Cntaining Poly (Phenylene Vinylene) With Enhanced Electron Drift Mobility, Xiong Gong
Xiong Gong
No abstract provided.
Polymer-Based Light-Emitting Diodes (Pleds) And Displays Fabricated From Arrays Of Pleds, Xiong Gong
Polymer-Based Light-Emitting Diodes (Pleds) And Displays Fabricated From Arrays Of Pleds, Xiong Gong
Xiong Gong
No abstract provided.
Electronic And Light-Emitting Properties Of Some Polyimides Based On Bis (2, 2': 6', 2''-Terpyridine) Ruthenium (Ii) Complex, Xiong Gong
Xiong Gong
A series of novel aromatic polyimides that contain bis(2,2′:6′,2″-terpyridine) ruthenium(II) complex was synthesized, and their optoelectronic properties were studied. The absorption of the polymers at 500 nm was strongly enhanced by the ruthenium complex. As a result, the photosensitivity of the polymers in the visible region is increased, as can be seen from the increase in photoconductivity. The glass transition temperature of the polymers is approximately 220°C and they also exhibit modest thermal stabilities. The electron and hole carrier mobilities of polyimides are on the order of 10 -4 cm 2 V -1 s -1, which suggests that the electron-withdrawing …
Synthesis And Photophysical Properties Of Some Conjugated Polymers Functionalized With Ruthenium Polypyridine Complexes, Xiong Gong
Xiong Gong
A series of conjugated polymers functionalized with different ruthenium polypyridine metal complexes were synthesized by the palladium catalyzed reaction. Two conjugated polymer systems have been studied: 1. poly(phenylenevinylene) with bis(2,2':6',2”-terpyridine) ruthenium (II) on the mainchain and 2. quinoxaline based polymers with tris(2,2'-bipyridine) ruthenium (II). The ruthenium polypyridine complexes exhibit a long-lived metal to ligand charge transfer excited state which can enhance the photosensitivity of the resulting polymers. Different physical properties such as the photoconductivity and charge mobility in these polymers are also studied.
Long-Lifetime Polymer Light-Emitting Electrochemical Cells Fabricated With Crosslinked Hole-Transport Layers, Xiong Gong
Long-Lifetime Polymer Light-Emitting Electrochemical Cells Fabricated With Crosslinked Hole-Transport Layers, Xiong Gong
Xiong Gong
By inserting a crosslinkable hole-transport layer as the buffer layer between the single-phase polymer active layer and the anode of this new type of polymer light-emitting electrochemical cells (PLECs), the interface properties are improved and the PLECs can be operated with enhanced stability.
High-Detectivity Polymer Photodetectors With Spectral Response From 300 Nm To 1450 Nm, Xiong Gong
High-Detectivity Polymer Photodetectors With Spectral Response From 300 Nm To 1450 Nm, Xiong Gong
Xiong Gong
Sensing from the ultraviolet-visible to the infrared is critical for a variety of industrial and scientific applications. Today, gallium nitride–, silicon-, and indium gallium arsenide–-based detectors are used for different sub-bands within the ultraviolet to near-infrared wavelength range. We demonstrate polymer photodetectors with broad spectral response (300 to 1450 nanometers) fabricated by using a small-band-gap semiconducting polymer blended with a fullerene derivative. Operating at room temperature, the polymer photodetectors exhibit detectivities greater than 1012 cm Hz1/2/W and a linear dynamic range over 100 decibels. The self-assembled nanomorphology and device architecture result in high photodetectivity over this wide spectral range and …
Nanowire Crystals Of A Rigid Rod Conjugated Polymer, Xiong Gong
Nanowire Crystals Of A Rigid Rod Conjugated Polymer, Xiong Gong
Xiong Gong
In this paper, we show that well-defined, highly crystalline nanowires of a rigid rod conjugated polymer, a poly(para-phenylene ethynylene)s derivative with thioacetate end groups (TA-PPE), can be obtained by self-assembling from a dilute solution. Structural analyses demonstrate the nanowires with an orthorhombic crystal unit cell wherein the lattice parameters are a ≈ 13.63 Å, b ≈ 7.62 Å, and c ≈ 5.12 Å; in the nanowires the backbones of TA-PPE chains are parallel to the nanowire long axis with their side chains standing on the substrate. The transport properties of the nanowires examined by organic field-effect transistors (OFETs) suggest the …
Conference Paper: Quinoxaline-Based Conjugated Polymers Containing Ruthenium (Ii) Bipyridine Metal Complex, Xiong Gong
Conference Paper: Quinoxaline-Based Conjugated Polymers Containing Ruthenium (Ii) Bipyridine Metal Complex, Xiong Gong
Xiong Gong
No abstract provided.