Advanced Functional Materials

Cover image for Vol. 18 Issue 19

October 9, 2008

Volume 18, Issue 19

Pages 2843–3092

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
    1. Cover Picture: Highly Sensitive, Photocontrolled, Organic Thin-Film Transistors Using Soluble Star-shaped Conjugated Molecules (Adv. Funct. Mater. 19/2008)

      Mi Yeon Cho, Su Jin Kim, Yoon Deok Han, Dong Hyuk Park, Kyung Hwan Kim, Dong Hoon Choi and Jinsoo Joo

      Version of Record online: 6 OCT 2008 | DOI: 10.1002/adfm.200890076

      Thumbnail image of graphical abstract

      Highly photosensitive characteristics of organic thin film transistors (OTFTs) are reported for soluble star-shaped oligothiophenes with four π-conjugated arms. Organic phototransistors (OPTs) using 4(HPBT)-benzene exhibited high photosensitivity even at low optical powers. Using a high ratio of on-and-off current switching with low optical power, a reproducible memory operation for the OPTs is performed. The cover image shows photosensitive OTFTs using soluble star-shaped 4(HPBT)-benzene molecules, as reported on p. 2905 by Cho and co-workers.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
    1. Inside Front Cover: Hydrothermal Reaction Mechanism and Pathway for the Formation of K2Ti6O13 Nanowires (Adv. Funct. Mater. 19/2008)

      Ting Zhang, Qing Chen and Lian-Mao Peng

      Version of Record online: 6 OCT 2008 | DOI: 10.1002/adfm.200890077

      Thumbnail image of graphical abstract

      On p. 3018, Peng and co-workers propose an electrokinetic model to address the mechanism for the autonomous motion of metal nanoparticles (Ag and Au) in silicon during hydrofluoric acid etching. The electrochemical reaction at the catalytic metal particle surface is bipolar and the energy generated from the bipolar reaction drives the tunneling motion of the metal nanoparticle in Si that continuously catalyzes the oxidization and dissolution of silicon to form a pore. The motility of metal nanoparticles in silicon could be exploited to create desirable silicon nanostructures.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
  4. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
    1. A Novel Cross-linked Poly(vinyl alcohol) (PVA) for Vascular Grafts (pages 2855–2861)

      Marc Chaouat, Catherine Le Visage, Wilms E. Baille, Brigitte Escoubet, Frédéric Chaubet, Mircea Alexandru Mateescu and Didier Letourneur

      Version of Record online: 9 SEP 2008 | DOI: 10.1002/adfm.200701261

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      Small diameter vascular grafts can be prepared from crosslinked PVA films, and either glued or stitched. Their mechanical characteristics are close to those of human arteries. The grafts were tested successfully in vivo as a replacement for a rat abdominal aorta.

    2. Nanosized Glass Frit as an Adhesion Promoter for Ink-Jet Printed Conductive Patterns on Glass Substrates Annealed at High Temperatures (pages 2862–2868)

      Daehwan Jang, Dongjo Kim, Byoungyoon Lee, Sungsoo Kim, Minsoo Kang, Dongki Min and Jooho Moon

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800238

      Thumbnail image of graphical abstract

      Silver nanoparticle-based printable ink suitable for high-temperature annealing is described. Incorporation of well-controlled nanosized glass frit leads to crack-free, dense, yet highly conductive patterns annealed at above 500 °C. The liquid phase of the glass forms when annealed above its glass transition temperature, promoting adhesion of the film to the substrate and reducing the volume shrinkage by filling the interstices between Ag nanoparticles.

    3. Reversible Fluorescent On–Off Recording in a Highly Transparent Polymeric Material Utilizing Fluorescent Resonance Energy Transfer (FRET) Induced by Heat Treatment (pages 2869–2879)

      Shuzo Hirata, Kwang-Sup Lee and Toshiyuki Watanabe

      Version of Record online: 9 SEP 2008 | DOI: 10.1002/adfm.200700994

      Thumbnail image of graphical abstract

      Reversible recording of fluorescence by heat treatment is accomplished using a polymer matrix containing dispersed fluorescent dye, fluoran dye, and developer with a long alkyl chain. Nanoscale aggregation changes of the developer trigger uniform fluorescence changes, producing transparency in the emission and quenching states. This material can be applied to multilayer recording and near-field optical data storage at high resolution.

    4. Evaluation of Half-Heusler Compounds as Thermoelectric Materials Based on the Calculated Electrical Transport Properties (pages 2880–2888)

      Jiong Yang, Huanming Li, Ting Wu, Wenqing Zhang, Lidong Chen and Jihui Yang

      Version of Record online: 16 SEP 2008 | DOI: 10.1002/adfm.200701369

      Thumbnail image of graphical abstract

      The electronic structures and electrical transport properties of 36 well-selected half-Heusler (HH) compounds are studied using ab initio calculations and the Boltzmann transport equation under the constant relaxation time approximation. The estimated optimal doping levels and Seebeck coefficients show reasonable agreement with the measured results for some HH systems. A few HHs are recommended to be potentially good p-type (see figure) and n-type thermoelectric materials based on our calculations.

    5. Hydrogel Scaffolds of Amphiphilic and Acidic β-Sheet Peptides (pages 2889–2896)

      Hanna Rapaport, Haviv Grisaru and Tova Silberstein

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800117

      Thumbnail image of graphical abstract

      Acidic and amphiphilic β-sheet forming peptides comprising the sequence Pro-Y-(Z-Y)n-Pro, with Y = Asp or Glu, Z = Leu or Phe, can assemble into fibrils and hydrogel structures that are stabilized at near neutral pH values, both by van der Waals forces and by hydrogen bonds between the acidic amino acids side chains. These hydrogels support cell growth in 2D and 3D cultures.

    6. Surface-Directed Phase Separation of Conjugated Polymer Blends for Efficient Light-Emitting Diodes (pages 2897–2904)

      Keng-Hoong Yim, Zijian Zheng, Richard H. Friend, Wilhelm T. S. Huck and Ji-Seon Kim

      Version of Record online: 9 SEP 2008 | DOI: 10.1002/adfm.200800287

      Thumbnail image of graphical abstract

      A surface-directed phase separation in conjugated-polymer blend thin films is used to fabricate efficient light-emitting diodes and detailed structure analysis of phase-separated blend thin films is performed to explain the improved device performance.

    7. Highly Sensitive, Photocontrolled, Organic Thin-Film Transistors Using Soluble Star-shaped Conjugated Molecules (pages 2905–2912)

      Mi Yeon Cho, Su Jin Kim, Yoon Deok Han, Dong Hyuk Park, Kyung Hwan Kim, Dong Hoon Choi and Jinsoo Joo

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800358

      Thumbnail image of graphical abstract

      The use of 4(HPBT)-benzene and 4(HP3T)-benzene, which are soluble, star-shaped, p-conjugated molecules, to fabricate highly photosensitive organic thin-film transistors is shown. Organic phototransistors based on 4(HPBT)-benzene have a high photosensitivity even with low optical powersat zero gate bias. They show a high on-off current switching ratio of ∼4 × 104 with low optical power and low gate bias.

    8. Synthesis and Optical Properties of KYF4/Yb, Er Nanocrystals, and their Surface Modification with Undoped KYF4 (pages 2913–2918)

      Helmut Schäfer, Pavel Ptacek, Otmane Zerzouf and Markus Haase

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800368

      Thumbnail image of graphical abstract

      IR-to-vis upconversion fluorescent nanocrystals of cubic phase Yb, Er doped KYF4, and surface-modified KYF4 nanocrystals are synthesized in a high-boiling solvent. The enormous improvement of the upconversion efficiency by modifying the surface can be seen by the naked eye.

    9. Connective-Tissue Fibroblasts Established on Micropillar Interfaces are Pivotal for Epithelial-Tissue Morphogenesis (pages 2919–2929)

      Eva Mussig, Thorsten Steinberg, Simon Schulz, Joachim P. Spatz, Jens Ulmer, Niels Grabe, Annette Kohl, Gerda Komposch and Pascal Tomakidi

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800381

      Thumbnail image of graphical abstract

      Gingival connective tissue fibroblasts (GCTFs) on polydimethylsiloxane micropillar interfaces are applied as a microenvironment to analyze their pivotal role for epithelial-tissue morphogenesis. The high-power magnification image reveals successful adhesion and growth of GCTFs on fibronectin-coated pillar heads, forming a nearly confluent layer on the micropillar interfaces.

      Corrected by:

      Correction: Connective-Tissue Fibroblasts Established on Micropillar Interfaces are Pivotal for Epithelial-Tissue Morphogenesis

      Vol. 18, Issue 21, Version of Record online: 4 NOV 2008

    10. Diffusion Controlled and Temperature Stable Microcapsule Reaction Compartments for High-Throughput Microcapsule-PCR (pages 2930–2937)

      Wing Cheung Mak, Kwan Yee Cheung and Dieter Trau

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800388

      Thumbnail image of graphical abstract

      A novel microcapsule-based approach to perform a high number of individual polymerase chain reactions (PCR) is demonstrated. Temperature-stable microcapsules with a permeable capsule wall are constructed by matrix-assisted layer-by-layer encapsulation. During the PCR, low molecular dNTPs are supplied externally and diffuse through the permeable capsule wall into the interior, while high molecular weight PCR product are accumulated within the microcapsule. Microcapsules do not exchange templates or primers during PCR cycles and represent individual reaction compartments.

    11. An Air-Supported Liquid Crystal System for Real-Time and Label-Free Characterization of Phospholipases and Their Inhibitors (pages 2938–2945)

      Deny Hartono, Xinyan Bi, Kun-Lin Yang and Lin-Yue Lanry Yung

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800424

      Thumbnail image of graphical abstract

      Cross-polarized optical images of the air-supported liquid crystal 5CB laden with L-DLPC phospholipid monolayer when exposed to various concentrations of phospholipase PLA2, PLC, and PLD. In the case of PLA2, the enzymatic detection is less than 1 pg, making this system suitable for characterizing the activities of precious enzyme samples.

    12. Surfactant-Free, Self-Assembled PVA-Iron Oxide/Silica Core–Shell Nanocarriers for Highly Sensitive, Magnetically Controlled Drug Release and Ultrahigh Cancer Cell Uptake Efficiency (pages 2946–2955)

      Shang-Hsiu Hu, Dean-Mo Liu, Wei-Lin Tung, Chen-Fu Liao and San-Yuan Chen

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800428

      Thumbnail image of graphical abstract

      Self-assembled iron oxide/silica core–shell (SAIO@SiO2) nanocarriers are utilized as bifunctional magnetic vectors, which can be triggered for control release of therapeutic agentby an external magnetic field. Drug-release profiles of the nanocarriers can be well regulated through an ultrathin layer of silica shell.

    13. Multifunctional Mesostructured Silica Microspheres from an Ultrasonic Aerosol Spray (pages 2956–2962)

      Li Li, Chia-Kuang Tsung, Tian Ming, Zhenhua Sun, Weihai Ni, Qihui Shi, Galen D. Stucky and Jianfang Wang

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800453

      Thumbnail image of graphical abstract

      Multifunctional mesostructured silica microspheres that exhibit luminescent, magnetic or photosensitive properties are prepared using an ultrasonic aerosol spray in conjunction with solvent evaporation-induced assembly. Rare-earth complexes, magnetite particles, photoacid generators, and pH-sensitive dyes are chosen as functional components, and can be readily incorporated into microspheres by dispersing them in the precursor solution of the aerosol spray process.

    14. Perfluorooctyl Bromide Polymeric Capsules as Dual Contrast Agents for Ultrasonography and Magnetic Resonance Imaging (pages 2963–2971)

      Emilia Pisani, Nicolas Tsapis, Belfor Galaz, Mathieu Santin, Romain Berti, Nicolas Taulier, Erol Kurtisovski, Olivier Lucidarme, Michèle Ourevitch, Bich Thuy Doan, Jean Claude Beloeil, Brigitte Gillet, Wladimir Urbach, S. Lori Bridal and Elias Fattal

      Version of Record online: 1 SEP 2008 | DOI: 10.1002/adfm.200800454

      Thumbnail image of graphical abstract

      Nanocapsules with a liquid core of perfluorooctyl bromide and a polymeric shell of poly(lactide-co-glycolide) are easily observed in the vascularization with ultrasonography after intravenous injection to mice.

    15. Single Component Self-Assembled Monolayers of Aromatic Azo-Biphenyl: Influence of the Packing Tightness on the SAM Structure and Light-Induced Molecular Movements (pages 2972–2983)

      Mark Elbing, Alfred Błaszczyk, Carsten von Hänisch, Marcel Mayor, Violetta Ferri, Christian Grave, Maria Anita Rampi, Giuseppina Pace, Paolo Samorì, Andrei Shaporenko and Michael Zharnikov

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800652

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      The photoswitching behavior and structure of two self-assembled monolayer systems with two sterically different aromatic azo-biphenyls is studied in detail. Differences in photoswitching are observed depending on the packing density of the SAM, which can be correlated with the nature of the molecular isomerization in the two SAM systems.

    16. Enhancement and Concurrence of Emissions from Multiple Fluorophores in a Single Emitting Layer of Micellar Nanostructures (pages 2984–2989)

      Seong Il Yoo, Jae-Hyun Lee, Byeong-Hyeok Sohn, Intae Eom, Taiha Joo, Sung Jin An and Gyu-Chul Yi

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800702

      Thumbnail image of graphical abstract

      Concurrent emission of multiple fluorophores from a single emitting layer with enhanced intensities by fluorescence resonance energy transfer (FRET) is achieved by fully utilizing a micellar nanostructure consisting of a core and a corona, that is, the core acts as a place for FRET between light-collecting donors and light-emitting fluorophores, and the corona as an effective blockade for FRET between light-emitting fluorophores.

    17. Insight into the Role of Oxygen Diffusion in the Sensing Mechanisms of SnO2 Nanowires (pages 2990–2994)

      Francisco Hernandez-Ramirez, Joan Daniel Prades, Albert Tarancon, Sven Barth, Olga Casals, Roman Jimenez-Diaz, Eva Pellicer, Jordi Rodriguez, Joan Ramon Morante, Miguel Angel Juli, Sanjay Mathur and Albert Romano-Rodriguez

      Version of Record online: 9 SEP 2008 | DOI: 10.1002/adfm.200701191

      Thumbnail image of graphical abstract

      Oxygen diffusion causes strong changes to the electrical properties of SnO2 nanowires, leading to long-term resistance transients when gas-sensing measurements are performed. Accurate modeling of this phenomenon is necessary to develop real nanodevices and to avoid undesired drift effects. A model that describes the dependence of nanowire resistance on oxygen partial pressure has been developed and applied for the characterization of other oxides (see figure).

    18. Ordered Mesoporous Carbon/Fused Silica Composites (pages 2995–3002)

      Jiacheng Wang, Changshu Xiang, Qian Liu, Yubai Pan and Jingkun Guo

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200701406

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      Ordered mesoporous carbon (OMC)/fused silica composites are prepared via the combination of a controllable but simple sol-gel-process with a hot-pressing technique. As-synthesized composites may be applied as highly efficient electromagnetic interference (EMI) shielding or electromagnetic (EM) wave absorbing materials in the X band of the electromagnetic spectrum.

    19. Fuel Cell Membrane Electrode Assemblies Fabricated by Layer-by-Layer Electrostatic Self-Assembly Techniques (pages 3003–3009)

      André D. Taylor, Marc Michel, Ryan C. Sekol, Jeremy M. Kizuka, Nicholas A. Kotov and Levi T. Thompson

      Version of Record online: 24 SEP 2008 | DOI: 10.1002/adfm.200701516

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      Fuel cell membrane electrode assemblies (MEAs) are fabricated using layer-by-layer assembly (LBL). The MEAs contain high activity, carbon-supported Pt electrocatalysts synthesized via supercritical fluid and selective heterogeneous nucleation methods. Due to the ultrathin nature and excellent homogeneity characteristics of LBL materials, higher Pt utilizations are observed using these nanocomposite assemblies as catalyst and gas diffusion layers.

      Corrected by:

      Correction: Fuel Cell Membrane Electrode Assemblies Fabricated by Layer-by-Layer Electrostatic Self-Assembly Techniques

      Vol. 18, Issue 21, Version of Record online: 4 NOV 2008

    20. Thermo-electrochemical Activation of an In–Cu Intermetallic Electrode for the Anode in Lithium Secondary Batteries (pages 3010–3017)

      Yoon S. Jung, Kyu T. Lee, Jun H. Kim, Ji Y. Kwon and Seung M. Oh

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200701526

      Thumbnail image of graphical abstract

      A Cu7In3 electrode that is inactive for lithiation at room temperature as a result of the activation energy required for Cu[BOND]In bond cleavage, is activated by a discharge–charge cycling at elevated temperatures. The underlying activation mechanism is the formation of a new In-rich phase (CuIn) by an alloying reaction between nanosized metallic Cu and In at the final stage of de-lithiation.

    21. Hydrothermal Reaction Mechanism and Pathway for the Formation of K2Ti6O13 Nanowires (pages 3018–3025)

      Ting Zhang, Qing Chen and Lian-Mao Peng

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800360

      Thumbnail image of graphical abstract

      The K2Ti6O13 nanowires can be synthesized by a hydrothermal reaction between Na2Ti3O7 and a KOH solution. Splitting of the Na2Ti3O7 crystal is observed as the reason for nanowire formation, and density functional theory is used to find a possible reaction pathway. The energy relationship among the intermediate states is shown, and the possible reaction pathway is used to explain the experimental phenomenon.

    22. Motility of Metal Nanoparticles in Silicon and Induced Anisotropic Silicon Etching (pages 3026–3035)

      Kuiqing Peng, Aijiang Lu, Ruiqin Zhang and Shuit-Tong Lee

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800371

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      An electrokinetic model is proposed to explain the microscopic dynamic origin of mobility of metal particles in Si. According to this model, the power generated in the in-situ bipolar electrochemical reaction at the metal particle surface can be directly converted into mechanical work to propel the motion of the metal particle inside the silicon with the assistance of hydrofluoric acid.

    23. Organic-Oxide Cathode Buffer Layer in Fabricating High-Performance Polymer Light-Emitting Diodes (pages 3036–3042)

      Tsung-Hsun Lee, Jung-Chun-Andrew Huang, Georgi L'vovich Pakhomov, Tzung-Fang Guo, Ten-Chin Wen, Yi-Shun Huang, Chuan-Cheng Tsou, Chia-Tin Chung, Ying-Chang Lin and Yao-Jane Hsu

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800403

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      The origin of ethylene-oxide functionalized cathode buffer layer in fabricating high-performance PLEDs is discussed. The reaction of PEGDE layer with thermally evaporated Al suppresses the diffusion of Al into the light-emissive polymer layer, potentially inhibiting oxidization and generation of metal-induced EL quenching sites near the recombination zone. The salt-free, neutral PEGDE interfacial layer can be easily integrated with manufacturing procedures.

    24. Selective Patterned Growth of Single-Crystal Ag–TCNQ Nanowires for Devices by Vapor–Solid Chemical Reaction (pages 3043–3048)

      Kai Xiao, Jing Tao, Alex A. Puretzky, Ilia N. Ivanov, Scott T. Retterer, Stephen J. Pennycook and David B. Geohegan

      Version of Record online: 24 SEP 2008 | DOI: 10.1002/adfm.200800430

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      Single-crystal organic semiconductor nanowires of silver-tetracyanoquinodimethane (Ag–TCNQ) are synthesized and patterned by a vapor–solid chemical reaction process. This process permits the self-assembled growth of the nanowires to be integrated with device fabrication. The nanowires are shown to act as memory switches, making them potentially useful in optical storage, ultra-high-density nanoscale memory, and logic devices.

    25. Liquid Manipulation Lithography to Fabricate a Multifunctional Microarray of Organosilanes on an Oxide Surface under Ambient Conditions (pages 3049–3055)

      Naoto Shirahata, Jun Nakanishi, Yoshitaka Echikawa, Atsushi Hozumi, Yoshitake Masuda, Shigeru Ito and Yoshio Sakka

      Version of Record online: 25 SEP 2008 | DOI: 10.1002/adfm.200800438

      Thumbnail image of graphical abstract

      Multifunctional microarrays, in which different types of self-assembled monolayers (SAMs) are positioned on predefined surface sites, are successfully created on oxide-covered silicon substrates by liquid manipulation lithography. The use of the SAM microarrays allows the parallel detection of varieties of biomolecular interactions on one platform surface under the same experimental conditions.

    26. Optimization of Orange-Emitting Electrophosphorescent Copolymers for Organic Light-Emitting Diodes (pages 3056–3062)

      Andreas Haldi, Alpay Kimyonok, Benoit Domercq, Lauren E. Hayden, Simon C. Jones, Seth R. Marder, Marcus Weck and Bernard Kippelen

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800446

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      Orange-emitting phosphorescent copolymers containing iridium complexes and bis(carbazolyl)fluorene groups in their side chains are employed as the emissive layer in multilayer organic light-emitting diodes. By varying the molecular weight and the iridium loading level of the copolymers, and by changing the linker between the side chains and the polymer backbone, an optimized efficiency of 4.9 ± 0.4% at 100 cd m2 is achieved.

    27. Growth, Cathodoluminescence and Field Emission of ZnS Tetrapod Tree-like Heterostructures (pages 3063–3069)

      Zhi-Gang Chen, Jin Zou, Gang Liu, Xiangdong Yao, Feng Li, Xiao-Li Yuan, Takashi Sekiguchi, Gao Qing Lu and Hui-Ming Cheng

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800447

      Thumbnail image of graphical abstract

      Dual phase ZnS tetrapod tree-like heterostructure with a zinc blende phase for the trunk and hexagonal wurtzite for the branches are synthesized (see figure). Superior field emission with a low turn-on field, high field-enhancement factor, large current density, and small fluctuation are observed.

    28. A Ligand Exchange Route to Highly Luminescent Surface-Functionalized ZnS Nanoparticles and Their Transparent Polymer Nanocomposites (pages 3070–3079)

      Changli Lü, Junfang Gao, Yuqin Fu, Yaying Du, Yongli Shi and Zhongmin Su

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800452

      Thumbnail image of graphical abstract

      Functionalized ZnS nanoparticles with strong fluorescence emission are prepared via ligand exchange and introduced into a polymer matrix to obtain the transparent polymer nanocomposites by in situ bulk polymerization. The resultant bulk nanocomposites exhibit a tunable fluorescent emission and outstanding thermal stability as well as processability.

    29. Solution-Processible Phosphorescent Blue Dendrimers Based on Biphenyl-Dendrons and Fac-tris(phenyltriazolyl)iridium(III) Cores (pages 3080–3090)

      Shih-Chun Lo, Raghu N. Bera, Ruth E. Harding, Paul L. Burn and Ifor D. W. Samuel

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/adfm.200800658

      Thumbnail image of graphical abstract

      Solution-processible saturated blue phosphorescence is an important goal for organic light-emitting diodes (OLEDs). Dendrimers with fac-tris (5-aryltriazolyl)iridium(III) cores with three or six dendrons can emit blue phosphorescence at room temperature in the solid-state. A dendrimer with six dendrons (see figure) had a film photoluminescence quantum yield of 67%, and bilayer OLEDs containing a neat dendrimer film achieved a brightness of 142 cd m−2 at 3.8 V with an external quantum efficiency of 7.9%.

  5. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index

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