Advanced Optical Materials

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Recently Published Articles

  1. Polarization Control in Terahertz Metasurfaces with the Lowest Order Rotational Symmetry

    Longqing Cong, Ningning Xu, Weili Zhang and Ranjan Singh

    Article first published online: 28 APR 2015 | DOI: 10.1002/adom.201500100

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    A planar metamolecule with twofold rotational symmetry that shows giant cross polarization transmission leads to strong optical activity and behaves as a perfect circular polarizer. Such planar meta­surfaces would be used to design active polarization control devices and high efficiency wave deflector by carefully engineering the phase discontinuities for real applications in optical and terahertz technologies.

  2. Enhanced Light Extraction from Mechanically Flexible, Nanostructured Organic Light-Emitting Diodes with Plasmonic Nanomesh Electrodes

    Sung-Min Lee, Yunil Cho, Dong-Young Kim, Joon-Sik Chae and Kyung Cheol Choi

    Article first published online: 28 APR 2015 | DOI: 10.1002/adom.201500103

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    Characteristics of light extraction from nanostructured organic light-emitting diodes (OLEDs) incorporating plasmonic metal nanomesh anodes are investigated for achieving high-performance, flexible OLEDs. A highly efficient OLED is available when an off-optimal metal nanomesh electrode for high transmittance is used as an anode because the surface plasmon loss is singnificantly reduced at a nanomesh period inconsistent with its optimal period.

  3. Hybrid Graphene–Perovskite Phototransistors with Ultrahigh Responsivity and Gain

    Yusheng Wang, Yupeng Zhang, Yao Lu, Weidong Xu, Haoran Mu, Caiyun Chen, Hong Qiao, Jingchao Song, Shaojuan Li, Baoquan Sun, Yi-Bing Cheng and Qiaoliang Bao

    Article first published online: 24 APR 2015 | DOI: 10.1002/adom.201500150

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    A photoconductive gain of109 electrons per photon and a responsivity of ≈6.0 × 105 A W−1 are demonstrated in a hybrid photodetector that consists of monolayer graphene covered with a thin layer of dispersive organolead halide perovskite (CH3NH3PbBr2I) islands with sizes up to micrometers. The s-scanning near-field optical microscopy and photo­current mapping results provide real-space evidence for the charge transfer and photogating effect.

  4. High-Performance Organic Solar Cells with Broadband Absorption Enhancement and Reliable Reproducibility Enabled by Collective Plasmonic Effects

    Xuanhua Li, Xingang Ren, Fengxian Xie, Yongxing Zhang, Tingting Xu, Bingqing Wei and Wallace C. H. Choy

    Article first published online: 22 APR 2015 | DOI: 10.1002/adom.201500107

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    A significant enhancement of organic solar cell (OSC) performance from a power conversion efficiency (PCE) = 7.7% up to a maximum of 9.62% is reported, which is one of the highest efficiencies for plasmonic OSCs reported thus far for a single junction OSC. Importantly, the as-proposed device shows an excellent reproducibility of these devices, which is more applicable for the practical application.

  5. Controlling Emitting Dipole Orientation with Methyl Substituents on Main Ligand of Iridium Complexes for Highly Efficient Phosphorescent Organic Light-Emitting Diodes

    Kwon-Hyeon Kim, Jae-Yeol Ma, Chang-Ki Moon, Jeong-Hwan Lee, Jang Yeol Baek, Yun-Hi Kim and Jang-Joo Kim

    Article first published online: 21 APR 2015 | DOI: 10.1002/adom.201500141

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    Orientation of emission dipoles of heteroleptic iridium complexes in an emitting layer is controlled toward the horizontal direction by substituting the hydrogen atoms of the cyclometalated ligand by methyl groups and demonstrates an organic light-emitting diode with an unprecedentedly high external quantum efficiency of 34.1% and power efficiency of 157.6 lm W−1 using a new green emitter.