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  1. Large-Area Wide-Incident-Angle Metasurface Perfect Absorber in Total Visible Band Based on Coupled Mie Resonances

    Qinyu Qian, Ti Sun, Ying Yan and Chinhua Wang

    Version of Record online: 26 MAY 2017 | DOI: 10.1002/adom.201700064

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    A large-area ultrathin metasurface perfect absorber based on coupled Mie resonances of integrated arrays of dielectric and metallic nanopillars is proposed and demonstrated both theoretically and experimentally. In contrast to previous mechanisms, coupled Mie resonances are generated from two types of materials such that different Mie resonances occur complementarily at different wavelengths to realize high absorption over the entire visible band.

  2. Wavelength-Tunability and Multiband Emission from Single-Site Mn2+ Doped CaO Through Antiferromagnetic Coupling and Tailored Superexchange Reactions

    Enhai Song, Jinliang Wang, Shi Ye, Xiao-Bao Yang, Mingying Peng, Qinyuan Zhang and Lothar Wondraczek

    Version of Record online: 26 MAY 2017 | DOI: 10.1002/adom.201700070

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    Wavelength-tunable single-to-dual band photoluminescence and long persistent luminescence from Mn2+ ions located at a single type of crystallographic sites are demonstrated in Ca1-xO:xMn2+ by changing Mn2+-concentration at low overall doping level. The emission bands from isolated Mn2+ ions and from manganese dimers exhibit different dynamic and thermal behavior but similar excitation spectra, what enables tunability and lifetime-multiplexing.

  3. Optically Transparent Broadband Microwave Absorption Metamaterial By Standing-Up Closed-Ring Resonators

    Dawei Hu, Jie Cao, Wei Li, Cheng Zhang, Tianlong Wu, Qifan Li, Zhihong Chen, Yilong Wang and Jianguo Guan

    Version of Record online: 26 MAY 2017 | DOI: 10.1002/adom.201700109

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    An optically transparent metamaterial absorber, obtained by standing closed-ring resonators in an indium tin oxide backed Plexiglas board, demonstrates both a bandwidth for 90% microwave absorption exceeding 14 GHz and an average optical transmittance of 82% due to the simultaneous excitement of electric and magnetic resonances, as well as the multiple reflections.

  4. A Red Fluorescent Emitter with a Simultaneous Hybrid Local and Charge Transfer Excited State and Aggregation-Induced Emission for High-Efficiency, Low Efficiency Roll-Off OLEDs

    Tengxiao Liu, Liping Zhu, Shaolong Gong, Cheng Zhong, Guohua Xie, Erqian Mao, Junfeng Fang, Dongge Ma and Chuluo Yang

    Version of Record online: 26 MAY 2017 | DOI: 10.1002/adom.201700145

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    Benefitting from simultaneous hybrid local and charge transfer and aggregation-induced emission features, a new red fluorescent emitter enables high-efficiency, low efficiency roll-off organic light-emitting diodes (OLEDs). Their external quantum efficiencies remained high at values of 3.0% and 2.3% at the high luminance of 5000 cd m−2, which are among the highest efficiencies at such high luminance for red/deep-red OLEDs.

  5. Optical Properties of Plasmonic Ultrathin TiN Films

    Deesha Shah, Harsha Reddy, Nathaniel Kinsey, Vladimir M. Shalaev and Alexandra Boltasseva

    Version of Record online: 26 MAY 2017 | DOI: 10.1002/adom.201700065

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    The optical properties of epitaxial, ultrathin films (<10 nm) of TiN are characterized by ellipsometry and Hall measurements. The decreasing metallicity and lower losses in thinner films is attributed to the increase in their defect concentration. However, even at 2 nm, the films exhibit a high carrier concentration, indicating that they remain plasmonic.