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    Chirality and Nanophotonics

    Ventsislav K. Valev, Alexander O. Govorov and John Pendry

    Version of Record online: 16 AUG 2017 | DOI: 10.1002/adom.201700501

  2. Metal-Loaded Dielectric Resonator Metasurfaces for Radiative Cooling

    Chengjun Zou, Guanghui Ren, Md Muntasir Hossain, Shruti Nirantar, Withawat Withayachumnankul, Taimur Ahmed, Madhu Bhaskaran, Sharath Sriram, Min Gu and Christophe Fumeaux

    Version of Record online: 11 AUG 2017 | DOI: 10.1002/adom.201700460

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    A metal-loaded dielectric resonator metasurface is proposed and experimentally demonstrated. The structure achieves strong broadband selective thermal emission over a wide angle at mid-infrared frequencies. This concept results in passive cooling devices that can lower temperature by 10 °C below ambient temperature.

  3. Negative Polaron-Stabilizing Host for Improved Operational Lifetime in Blue Phosphorescent Organic Light-Emitting Diodes

    Sung Yong Byeon, Si Hyun Han and Jun Yeob Lee

    Version of Record online: 10 AUG 2017 | DOI: 10.1002/adom.201700387

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    The host materials for blue phosphorescent organic light-emitting diodes are designed to reinforce negative polaron stability. The synthesized blue host material, 9-(dibenzo[b,d]thiophen-2-yl)-9H-3,9′-bicarbazole exhibits a very high triplet energy of 2.97 eV and shows improved device operational lifetime due to improved intrinsic bond stability against negative polarons.

  4. Giant Enhancement of Luminescence from Phosphors through Oxygen-Vacancy-Mediated Chemical Pressure Relaxation

    Kai Zhang, Chong-Geng Ma, Jun-Ying Zhang, Bo-Mei Liu, Yang Zhou, Shao-Qiang Guo, Jia-Yue Xu, Jing-Shan Hou, Yong-Zheng Fang, Li-Rong Zheng and Hong-Tao Sun

    Version of Record online: 10 AUG 2017 | DOI: 10.1002/adom.201700448

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    Oxygen-vacancy-mediated chemical pressure relaxation is proposed and confirmed as a universal strategy to significantly enhance photoluminescence from phosphors with large-size-mismatched dopants. Experimental and theoretical results suggest that topotactic creation of oxygen vacancies favors the modification of local environment of dopant due to the expansion of coordination geometry, thus leading to the conversion of dark emitters into bright cousins.

  5. A Broadband Optical Diode for Linearly Polarized Light Using Symmetry-Breaking Metamaterials

    Minkyung Kim, Kan Yao, Gwanho Yoon, Inki Kim, Yongmin Liu and Junsuk Rho

    Version of Record online: 7 AUG 2017 | DOI: 10.1002/adom.201700600

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    Optical diodes that allow unidirectional light transportation as an optical analogy of electrical diodes are in high demand. A metamaterial supporting a broad range of asymmetric transmission and its physical background is demonstrated. The asymmetric light behavior will enable a variety of photonic applications such as on-chip optical computing and information communication.

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