Advanced Materials

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Recently Published Articles

  1. Light-Fueled Microscopic Walkers

    Hao Zeng, Piotr Wasylczyk, Camilla Parmeggiani, Daniele Martella, Matteo Burresi and Diederik Sybolt Wiersma

    Article first published online: 28 MAY 2015 | DOI: 10.1002/adma.201501446

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    Artificial muscles have been investigated for a few decades, however, all attempts to build a micrometer-sized terrestrial robot have failed due to the huge natural adhesion. The first microscopic artificial walker equipped with liquid crystalline elastomer muscle is reported. The walker is fabricated by direct laser writing, smaller than any known living terrestrial creatures, and is capable of several autonomous locomotion on different surfaces.

  2. Imaging and Tailoring the Chirality of Domain Walls in Magnetic Films

    Gong Chen and Andreas K. Schmid

    Article first published online: 28 MAY 2015 | DOI: 10.1002/adma.201500160

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    Magnetic chirality is important because it enables highly efficient current-driven manipulation of magnetization. Recent progress in tailoring domain-wall chirality in magnetic multilayers is summarized and the use of magnetization-vector imaging by spin-polarized low-energy electron microscopy is highlighted.

  3. Gallium Nitride Nanowires and Heterostructures: Toward Color-Tunable and White-Light Sources

    Tevye R. Kuykendall, Adam M. Schwartzberg and Shaul Aloni

    Article first published online: 28 MAY 2015 | DOI: 10.1002/adma.201500522

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    The drive for ever more efficient light sources is at the base of fast growing industry, producing gallium nitride light-emitting diodes at cost and efficiencies that outperform most commercial solutions. GaN nanowires and heterostructures provide a new device architecture, promising to revolutionize white and color-tunable light emitters to be used in future lightening and display technologies.

  4. Understanding Small-Molecule Interactions in Metal–Organic Frameworks: Coupling Experiment with Theory

    Jason S. Lee, Bess Vlaisavljevich, David K. Britt, Craig M. Brown, Maciej Haranczyk, Jeffrey B. Neaton, Berend Smit, Jeffrey R. Long and Wendy L. Queen

    Article first published online: 28 MAY 2015 | DOI: 10.1002/adma.201500966

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    A combined experimental and theoretical approach proves essential for the elucidation of small-molecule interactions in a model metal–organic framework (MOF) system, M2(dobdc). The study of extensive families like this one can provide a platform to test the efficacy and accuracy of developing computational methodologies in slightly varying chemical environments, a task that is necessary for their evolution into viable, robust tools for screening large numbers of materials.

  5. Highly Efficient Orange and Red Phosphorescent Organic Light-Emitting Diodes with Low Roll-Off of Efficiency using a Novel Thermally Activated Delayed Fluorescence Material as Host

    Hui Wang, Lingqiang Meng, Xingxing Shen, Xiaofang Wei, Xiuli Zheng, Xiaopeng Lv, Yuanping Yi, Ying Wang and Pengfei Wang

    Article first published online: 28 MAY 2015 | DOI: 10.1002/adma.201501373

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    MTXSFCz with thermally activated delayed fluorescence is synthesized. Orange and red phosphorescent organic light-emitting diodes (PHOLEDs) with low efficiency roll-off exhibit external quantum efficiency (EQE) up to 11.8% and 15.6%. The efficient upconversion from triplet to singlet of host reduces the triplet density and thus affording a low efficiency roll-off of PHOLEDs.

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