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    Single-Molecule Characterization of Near-Infrared-Emitting Silver Nanoclusters

    Emma N. Hooley, Valentina Paolucci, Zhiyu Liao, Miguel R. Carro Temboury and Tom Vosch

    Article first published online: 17 APR 2015 | DOI: 10.1002/adom.201500048

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    Near-infrared-emitting silver nanoclusters stabilized in DNA are characterized using single-molecule spectroscopy, revealing complex and dynamic photophysics, with single clusters showing changes to their properties over time. The dynamical change in the photophysical properties suggests an intrinsic flexibility in the photophysical properties.

  2. Reversible Luminescence Switching of an Organic Solid: Controllable On–Off Persistent Room Temperature Phosphorescence and Stimulated Multiple Fluorescence Conversion

    Chenyu Li, Xi Tang, Liuqing Zhang, Cuihong Li, Zhengping Liu, Zhishan Bo, Yong Qiang Dong, Yong-Hui Tian, Yuping Dong and Ben Zhong Tang

    Article first published online: 16 APR 2015 | DOI: 10.1002/adom.201500115

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    On–off-switchable, persistent, room-temperature phosphorescence (373 ms) is realized in organic solids based on bis(4-(9H-carbazol-9-yl)phenyl)methanone. The reversible on–off RTP switching can be controlled by repeatedly chloroform fuming and heating (or grinding). Multi­ple-color fluorescence is also feasible, and they reversibly convert to each other under the stimuli of heating, shearing, and fuming with varied solvents.

  3. Performance and Quality Characterization of the Reference MNA Nonlinear Optical Molecular Crystal by Pockels Electrooptic Confocal Microscopy

    Bassam Hajj, Stephane Melanson, Jean Desforges, Serge Gauvin, Dominique Chauvat and Joseph Zyss

    Article first published online: 14 APR 2015 | DOI: 10.1002/adom.201500059

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    The electrooptical response at micrometer resolution of 2-methyl-4-nitroaniline thin films is studied using electrooptical microscopy. An electrooptical response map shows inhomogeneous regions surrounding regular ones and highlights multiple crystalline orientations. The polarization response provides an unambiguous assignment of the principle dielectric axis. Additionally, electric field sensing is demonstrated using Pockels effect.

  4. Thermally Tunable Metallodielectric Photonic Crystals from the Self-Assembly of Brush Block Copolymers and Gold Nanoparticles

    Dong-Po Song, Cheng Li, Nicholas S. Colella, Xuemin Lu, Jae-Hwang Lee and James J. Watkins

    Article first published online: 9 APR 2015 | DOI: 10.1002/adom.201500116

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    A robust strategy for the rapid and scalable fabrication of well-ordered metallodielectric 1D photonic crystals through the self-assembly of brush block copolymers and gold nanoparticles is demonstrated. The optical properties of the photonic crystals containing ultrahigh loadings of the gold nanoparticles are thermally tunable through the creation of a network structure of the nanoparticles.

  5. Fast Photoluminescence Switching in the Nematic Phase of Calamitic–Discotic Composites

    P. Lakshmi Madhuri, D. S. Shankar Rao, Channabasaveshwar V. Yelamaggad, Ammathnadu S. Achalkumar and S. Krishna Prasad

    Article first published online: 8 APR 2015 | DOI: 10.1002/adom.201500126

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    A fast photoluminescent switch driven by a dual frequency-addressing protocol is realized in a calamitic–discotic composite leading to two orders of magnitude accelerated dynamics. The local ordering in the nematic structure changes significantly as the discotic content increases. The anisotropic photoluminescence is also observed in samples confined by a hydrogen-bonded network.