Advanced Optical Materials

Cover image for Vol. 2 Issue 2

February 2014

Volume 2, Issue 2

Pages 103–196

  1. Cover Picture

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      OLEDs: 100 μm-Order Patterning of Organic Semiconductor Layers Using a Thermally Converted Precursor Technique and its Application to Organic Light Emitting Diodes (Advanced Optical Materials 2/2014) (page 103)

      Daisuke Goto, Masataka Mohri, Kei Morimoto, Aleksandre Mzhavia and Chihaya Adachi

      Version of Record online: 12 FEB 2014 | DOI: 10.1002/adom.201470008

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      High-resolution patterning of organic semiconductor layers using a thermally converted precursor is demonstrated by C. Adachi and co-workers on page 110. A precursor is prepared that can be thermally converted into α,β-TNB, losing its solubilizing groups to produce an insoluble component in isopropanol. Narrow pixel arrays with widths of 100–180 μm are then formed by thermal conversion of the α,β-TNB precursor, providing an OLED performance comparable to those made by vacuum deposition.

  2. Inside Front Cover

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      Photonic Materials: Silicon Hyperuniform Disordered Photonic Materials with a Pronounced Gap in the Shortwave Infrared (Advanced Optical Materials 2/2014) (page 104)

      Nicolas Muller, Jakub Haberko, Catherine Marichy and Frank Scheffold

      Version of Record online: 12 FEB 2014 | DOI: 10.1002/adom.201470009

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      Unusual network structures are used by F. Scheffold and co-workers as templates for a new type of disordered photonic material. The networks are constructed by 3D tessellation based on numerically generated point patterns with long-range hyperuniform correlations. On page 115, using a combination of direct laser writing lithography and chemical vapor deposition, mesoscale silicon replicas of the disordered networks are created. Optical transmittance measurements show a pronounced gap in the shortwave infrared at λG ≈ 2.6 μm.

  3. Back Cover

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      Chirality: Three Dimensional Chiral Metamaterial Nanospirals in the Visible Range by Vertically Compensated Focused Ion Beam Induced-Deposition (Advanced Optical Materials 2/2014) (page 198)

      Marco Esposito, Vittorianna Tasco, Francesco Todisco, Alessio Benedetti, Daniele Sanvitto and Adriana Passaseo

      Version of Record online: 12 FEB 2014 | DOI: 10.1002/adom.201470012

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      Chiral metamaterials in the form of metallic nanospirals allow the exploration of chiro-optical phenomena, such as dichroic selection. On page 154, by exploiting a highresolution nanofabrication technique based on focused ion beam-induced deposition, M. Esposito et al. accurately control the 3D evolution of the nanostructures, with the fabricated nano-objects showing a high circular dichroism in the visible range, paving the way towards advanced chiral photonic devices.

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      Masthead: (Advanced Optical Materials 2/2014)

      Version of Record online: 12 FEB 2014 | DOI: 10.1002/adom.201470011

  5. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Communications
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  6. Communications

    1. Top of page
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    5. Masthead
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    7. Communications
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    1. 100 μm-Order Patterning of Organic Semiconductor Layers Using a Thermally Converted Precursor Technique and its Application to Organic Light Emitting Diodes (pages 110–114)

      Daisuke Goto, Masataka Mohri, Kei Morimoto, Aleksandre Mzhavia and Chihaya Adachi

      Version of Record online: 8 NOV 2013 | DOI: 10.1002/adom.201300372

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      An N,N′-di(naphthalenyl)-N,N′-di(naphthalen-2-yl)-benzidine (α,β-TNB) precursor is prepared that can be thermally converted into α,β-TNB, losing its solubilizing groups to produce an insoluble component in isopropanol. Narrow pixel arrays with widths of 100-180 μm are then formed by thermal conversion of the α,β-TNB precursor, providing an OLED performance comparable to those made by vacuum deposition.

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      Silicon Hyperuniform Disordered Photonic Materials with a Pronounced Gap in the Shortwave Infrared (pages 115–119)

      Nicolas Muller, Jakub Haberko, Catherine Marichy and Frank Scheffold

      Version of Record online: 9 DEC 2013 | DOI: 10.1002/adom.201300415

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      The mesoscale fabrication of silicon hyperuniform disordered materials with a broad and pronounced photonic gap in the shortwave infrared is reported. Due to their unique structure and their high refractive index, these fascinating materials are predicted to possess a complete photonic bandgap in the absence of any long-range order.

    3. Laser-Mediated Programmable N Doping and Simultaneous Reduction of Graphene Oxides (pages 120–125)

      Li Guo, Yong-Lai Zhang, Dong-Dong Han, Hao-Bo Jiang, Dan Wang, Xian-Bin Li, Hong Xia, Jing Feng, Qi-Dai Chen and Hong-Bo Sun

      Version of Record online: 2 DEC 2013 | DOI: 10.1002/adom.201300401

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      Programmable N-doping and simultaneous reduction of graphine oxide (GO) by femtosecond laser direct writing in NH3 atmosphere is presented. The unique laser-mediated programmable doping permits complex micropatterns of N-doped graphene, and thus holds great promise for the fabrication and integration of graphene-based devices. N-type transistor behavior is observed in the post-fabricated field-effect transistors.

    4. Impact of the Band-Edge Fine Structure on the Energy Transfer between Colloidal Quantum Dots (pages 126–130)

      Iwan Moreels, Yolanda Justo, Gabriele Rainò, Thilo Stöferle, Zeger Hens and Rainer F. Mahrt

      Version of Record online: 27 NOV 2013 | DOI: 10.1002/adom.201300263

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      Förster energy transfer plays an important role in spectroscopic rulers, photovoltaics and solid-state light emission, and here is a novel way of controlling it. Using a colloidal quantum dot bilayer system, it is possible to change the transfer rate while maintaining a constant efficiency. The key is a thermal exciton redistribution over the different band-edge states, varying both the Förster and the intrinsic emission rate simultaneously.

    5. Synthesis and Optical Properties of Large-Area Single-Crystalline 2D Semiconductor WS2 Monolayer from Chemical Vapor Deposition (pages 131–136)

      Chunxiao Cong, Jingzhi Shang, Xing Wu, Bingchen Cao, Namphung Peimyoo, Caiyu Qiu, Litao Sun and Ting Yu

      Version of Record online: 11 DEC 2013 | DOI: 10.1002/adom.201300428

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      Large-area triangular single crystals of WS2 monolayer are synthesised from a chemical vapor deposition process and their optical properties are systematicly studied. This work paves the way to fabricate large-area single crystalline 2D semiconductors and study their fundamentals. It must be very meaningful for exploiting the great potential of WS2 for future optoelectronics.

    6. Label-Free Biosensor Based on an All-Polymer DFB Laser (pages 137–141)

      Esmaeil Heydari, Jens Buller, Erik Wischerhoff, André Laschewsky, Sebastian Döring and Joachim Stumpe

      Version of Record online: 10 JAN 2014 | DOI: 10.1002/adom.201300454

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      A monolithic active optical resonator biosensor is fabricated for label-free sensing. The all-polymer sensor consists of a polymer distributed feedback (DFB) laser and a hydrogel recognition layer. Specific binding of analyte modulates the effective refractive index, shifting the laser emission wavelength. Real time detection of avidin–biotin interactions is demonstrated as a model for the new label-free biosensing principle.

    7. Magneto-Electroluminescence as a Tool to Discern the Origin of Delayed Fluorescence: Reverse Intersystem Crossing or Triplet–Triplet Annihilation? (pages 142–148)

      Ping Chen, Zuhong Xiong, Qiming Peng, Jiangwen Bai, Shitong Zhang and Feng Li

      Version of Record online: 2 JAN 2014 | DOI: 10.1002/adom.201300422

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      A novel use of magneto-electroluminescence (MEL) is reported to discern the delayed fluorescence coming from reverse intersystem crossing (RISC) or triplet–triplet annihilation (TTA). The results indicate MEL could be used as a “fingerprinting” technique to exploit the phenomena behind highly efficient fluorescent OLEDs with quantum efficiencies exceeding the 25% theoretical limit.

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      Multi-Spectral Materials: Hybridisation of Optical Plasmonic Filters and a Terahertz Metamaterial Absorber (pages 149–153)

      Iain J. H. McCrindle, James Grant, Timothy D. Drysdale and David R. S. Cumming

      Version of Record online: 27 NOV 2013 | DOI: 10.1002/adom.201300408

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      Multi-spectral materials, using hybridised plasmonic and metamaterial structures, can simultaneously exhibit unique resonant phenomena over several decades of wavelengths. A multi-spectral material that combines a plasmonic colour filter array and a terahertz metamaterial absorber into a single material is a promising prospect for a coaxial multi-spectral imager operating in the visible, near IR, and terahertz wavebands.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Communications
    8. Full Papers
    1. Three Dimensional Chiral Metamaterial Nanospirals in the Visible Range by Vertically Compensated Focused Ion Beam Induced-Deposition (pages 154–161)

      Marco Esposito, Vittorianna Tasco, Francesco Todisco, Alessio Benedetti, Daniele Sanvitto and Adriana Passaseo

      Version of Record online: 8 OCT 2013 | DOI: 10.1002/adom.201300323

      Thumbnail image of graphical abstract

      Chiral nanostructures are innovative tools to control light–matter interactions at the nanoscale, allowing the exploration and exploitation of exotic optical phenomena such as wavelength-dependent circular dichroism. An FIBID process, with vertically discretized 3D nano-objects, allows control over the geometry with nanometer accuracy. The nanostructures exhibit a high light circular polarization sensitivity, opening the way to potential chiral photonics applications.

    2. Nanoantenna-Sandwiched Graphene with Giant Spectral Tuning in the Visible-to-Near-Infrared Region (pages 162–170)

      Lei Shao, Xiaomu Wang, Haitao Xu, Jianfang Wang, Jian-Bin Xu, Lian-Mao Peng and Hai-Qing Lin

      Version of Record online: 24 NOV 2013 | DOI: 10.1002/adom.201300313

      Thumbnail image of graphical abstract

      Graphene inserted in the gap between Au nanospheres and a Au film induces substantial red shifts in the plasmon resonance modes of the film-coupled nanoantennas. The giant optical response, caused by the tunable screening effect, is dependent on the number of graphene layers and can be varied by thermal annealing of graphene.

    3. Self-Assembled Plasmonic Oligomers for Organic Photovoltaics (pages 171–175)

      Francesco Pastorelli, Sebastien Bidault, Jordi Martorell and Nicolas Bonod

      Version of Record online: 18 NOV 2013 | DOI: 10.1002/adom.201300363

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      Plasmonic oligomers with a chemically controlled ∼1 nm gap can be introduced in organic-based thin solar cells to enhance both the external quantum efficiency and the short-circuit current. Cost-effective fabrication strategies are used for both the antennas and the ultra-thin film cells obtained using standard spin-coating techniques in ambient-air conditions.

    4. An Analytic Model for the Dielectric Function of Au, Ag, and their Alloys (pages 176–182)

      David Rioux, Simon Vallières, Sébastien Besner, Philip Muñoz, Eric Mazur and Michel Meunier

      Version of Record online: 21 DEC 2013 | DOI: 10.1002/adom.201300457

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      Through analysis of the band structure of Au and Ag and the subsequent fitting of measured dielectric functions of alloy thin films, an analytic model for the dielectric function of AuAg alloys is obtained. The model is validated for arbitrary alloy compositions by comparing the experimental extinction spectra of alloy nanoparticles with the spectra predicted by Mie theory.

    5. Crystal Structure and Luminescence Properties of Ca8Mg3Al2Si7O28:Eu2+ for WLEDs (pages 183–188)

      Wenzhen Lv, Yongchao Jia, Qi Zhao, Mengmeng Jiao, Baiqi Shao, Wei Lü and Hongpeng You

      Version of Record online: 21 DEC 2013 | DOI: 10.1002/adom.201300448

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      The novel phosphor Ca8Mg3Al2Si7O28:Eu2+ is synthesized via a high-temperature solid-state reaction. The phosphor shows a wide absorption band ranging from 230 to 450 nm and a bright and broad green color emission band with a maximum at 535 nm. The results indicate that the Ca8Mg3Al2Si7O28:Eu2+ has great potential to be a green phosphor for white light-emitting diodes.

    6. Single-Crystal Pd and its Alloy Nanowires for Plasmon Propagation and Highly Sensitive Hydrogen Detection (pages 189–196)

      Fuxing Gu, Heping Zeng, Y. B. Zhu, Qing Yang, L. K. Ang and Songlin Zhuang

      Version of Record online: 12 DEC 2013 | DOI: 10.1002/adom.201300413

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      Plasmon propagation in single-crystal Pd and its alloy nanowires is demonstrated by an evanescent wave coupling technique. Measured plasmon propagation losses are ∼2 and ∼0.6 dB μm-1 in an MgF2-supported and suspended Pd nanowires, respectively. Tunable propagation losses via alloying and hydrogen sensing with an amplitude sensitivity of over 10 dB and a detection limit down to 0.2% are demonstrated.

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