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  1. Ultrafast Multipolar Plasmon for Unidirectional Optical Switching in a Hemisphere-Nanoshell Array

    Yuanhai Lin and Xinping Zhang

    Version of Record online: 23 MAY 2017 | DOI: 10.1002/adom.201601088

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    Ultrafast multipolar plasmons are observed in a periodic array of hemisphere gold nanoshells. A dipolar and a hexapolar plasmon is observed to resonate at longer and shorter wavelengths, respectively. Free electrons are driven to oscillate through the nanoshells for the dipolar and in the inner shell and surrounding gold film for the hexapolar plasmons, which have different lifetimes in dynamics.

  2. Isomeric N-Linked Benzoimidazole Containing New Electron Acceptors for Exciplex Forming Hosts in Highly Efficient Blue Phosphorescent OLEDs

    Jia Hu, Chenyang Zhao, Tianmu Zhang, Xianping Zhang, Xudong Cao, Qingjing Wu, Yonghua Chen, Di Zhang, Youtian Tao and Wei Huang

    Version of Record online: 23 MAY 2017 | DOI: 10.1002/adom.201700036

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    Through an isomeric N-linkage, a new electron acceptor of 1,1′,1″-(pyridine-2,4,6-triyl)tris(2-phenyl-1H-benzo[d]imidazole) (iTPBIPy) exhibits simplified synthesis, comparable energy levels, but poorer electron-transport compared to commercial C-linked 2,2,2-(1,3,5-phenylene)-tris(1-phenyl-1H-benzimidazole) (TPBI). However, a maximum external quantum efficiency of 19.3% is achieved in a N,N′-dicarbazolyl-3,5-benzene (mCP):iTPBIPy exciplex cohosted blue phosphorescent organic light-emitting diode (OLED), which is significantly higher than 13.4% of mCP:TPBI.

  3. Perovskite/Polymer Hybrid Thin Films for High External Quantum Efficiency Photodetectors with Wide Spectral Response from Visible to Near-Infrared Wavelengths

    Yukun Wang, Dezhi Yang, Xiaokang Zhou, Dongge Ma, Agafonov Vadim, Tansir Ahamad and Saad M. Alshehri

    Version of Record online: 22 MAY 2017 | DOI: 10.1002/adom.201700213

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    This study successfully demonstrates an integrated perovskite/polymer device structure based on perovskite/hybrid thin films for efficient light harvesting. The expansion of the photoresponse spectrum is achieved by selecting an appropriate low band gap polymer (poly(diketopyrrolopyrrole-terthiophene), which has a wider response (950 nm) than perovskite.

  4. Photonic Tuning of the Emission Color of Nanophosphor Films Processed at High Temperature

    Dongling Geng, Gabriel Lozano, Mauricio E. Calvo, Nuria O. Núñez, Ana I. Becerro, Manuel Ocaña and Hernán Míguez

    Version of Record online: 22 MAY 2017 | DOI: 10.1002/adom.201700099

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    Integration of nanophosphors in optical resonators allows tuning their color coordinates. Emission of GdVO4:Dy3+ nanocrystals is strongly modulated from blue to yellow using photonic multilayers in which a transparent and bright nanophosphor film is integrated as an optical dopant. Photonics offers new opportunities to tailor the emission of nanophosphor materials, which can provide benefits to next generation light-emitting devices.

  5. Light Amplification in Molecules Exhibiting Thermally Activated Delayed Fluorescence

    Hajime Nakanotani, Taro Furukawa, Takuya Hosokai, Takuji Hatakeyama and Chihaya Adachi

    Version of Record online: 22 MAY 2017 | DOI: 10.1002/adom.201700051

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    Light amplification is observed in the thermally activated delayed fluorescence (TADF) emitter 9-([1,1•-biphenyl]-3-yl)-N,N,5,11-tetraphenyl-5,9-dihydro-5,9-diaza-13b-boranaphtho[3,2,1-de]anthracen-3-amine (DABNA-2). It is found that DABNA-2 possesses not only a large stimulated emission cross-section but also a favorable window for light amplification. These results indicate that TADF emitters can form a new category of laser dyes and are strong candidates for the realization of an organic semiconductor laser.