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Recently Published Articles

  1. Exploring the Mechanisms in STED-Enhanced Direct Laser Writing

    Joachim Fischer, Jonathan B. Mueller, Alexander S. Quick, Johannes Kaschke, Christopher Barner-Kowollik and Martin Wegener

    Article first published online: 25 NOV 2014 | DOI: 10.1002/adom.201400413

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    Lithography beyond the diffraction limit inspired by stimulated-emission-depletion microscopy holds promise for nanometer-scale resolution in three dimensions. The mechanisms of photo­initiation and photoinhibition of the polymerization are investigated in a model photoresist by tuning the repetition rate of excitation and depletion laser nearly five orders of magnitude. An adapted model for the effective exposure dose is presented.

  2. Ultrathin Resonant-Cavity-Enhanced Solar Cells with Amorphous Germanium Absorbers

    Volker Steenhoff, Martin Theuring, Martin Vehse, Karsten von Maydell and Carsten Agert

    Article first published online: 25 NOV 2014 | DOI: 10.1002/adom.201400386

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    Ultrathin 1D optical cavities enable strong and spectrally broad absorption in solar cells. This approach requires highly absorptive materials as well as tailoring of the phase shifts induced by the resonator interfaces. A current density of 20 mA cm–2 is obtained using an amorphous germanium absorber with a thickness of only 13 nm.

  3. Capture and Concentration of Light to a Spot in Plastic Lightguides by Circular Luminophore Arrangements

    Bardo J. Bruijnaers, Albertus P. H. J. Schenning and Michael G. Debije

    Article first published online: 21 NOV 2014 | DOI: 10.1002/adom.201400414

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    By aligning dichroic fluorescent dyes in semi- and circular patterns using liquid crystals, emitted light can be focused towards small regions or to the center of a lightguide. This enhanced light focusing could find use in a great number of applications, including LEDs and luminescent solar concentrators.

  4. Light-Emitting Liquid Crystal Displays Based on an Aggregation-Induced Emission Luminogen

    Dongyu Zhao, Fan Fan, Juan Cheng, Yilin Zhang, Kam Sing Wong, Vladimir G. Chigrinov, Hoi Sing Kwok, Lin Guo and Ben Zhong Tang

    Article first published online: 20 NOV 2014 | DOI: 10.1002/adom.201400428

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    A liquid crystalline molecule tetraphenyle­thylene-PPE with aggregation-induced emissive characteristics is synthesized. Anisotropic emission is obtained through the dissolution of tetraphenylethylene-PPE into nematic liquid crystals. Two types of photoluminescent display devices are fabricated with the mixture. This approach provides a path for building energy-saving light-emitting liquid crystal display devices that avoid the aggregation-caused quenching problem.

  5. Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

    Gongxun Bai, Ming-Kiu Tsang and Jianhua Hao

    Article first published online: 20 NOV 2014 | DOI: 10.1002/adom.201400375

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    Physical methods such as electric-field, magnetic-field, mechanical stress, temperature, photons, and ionizing radiation can tune the luminescence of phosphors, which should be beneficial for our understanding the fundamentals of luminescence and widespread applications. Recent advances in tuning the luminescence in a wide range of phosphors, including metal-ion-doped compounds, semiconductors, 2D layered nanomaterials, and organic phosphors, have been reviewed.