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首页> 外文期刊>Advanced Optical Materials >Multifunctional Chiral π-Conjugated Polymer Microspheres: Production and Confinement of NLO signal, Detection of Circularly Polarized Light, and Display of Laser-Triggered NLO Emission Shifts
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Multifunctional Chiral π-Conjugated Polymer Microspheres: Production and Confinement of NLO signal, Detection of Circularly Polarized Light, and Display of Laser-Triggered NLO Emission Shifts

机译：多功能手性π-共轭聚合物微球：NLO信号的生产和限制，检测圆偏振光，以及激光触发的NLO发射移位的显示

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Two chiral pi-conjugated polymers with optical nonlinearity (NLO), abbreviated as R- and S-BP, are prepared by copolymerization of R- and S-6,6'-dibromo-2,2'-diethoxy-1,1'-binaphthyl with 1,4-diethynyl-2,5-bis(octyloxy)benzene by Sonogashira coupling. The R- and S-BP copolymers self-assemble in a tetrahydrofuran/H2O/ethanol mixture producing microspherical particles. Remarkably, the obtained polymer microspheres support excitation of whispering gallery mode resonances (500-720 nm) in one- and two-photon excited luminescence or two-photon luminescence (TPL) with a quality factor (Q) of up to approximate to 700. As a result of a high Q value, a single (R- or S-BP) microsphere displays a circular dichroism (CD) effect in the TPL signal. At high laser pump-power (= 10 mW), the TPL spectral features of microspheres change significantly, suggesting alterations of the polymer packing. Similar spectral variations are observed for microspheres heated thermally or with high power continuous-wave laser. Photoluminescence lifetime imaging microscopy down to the single microsphere level corroborate transformations of polymer packing from a J type to a mixture of J, H, and H-like (with disordered side chains) types. This work demonstrates the tremendous potential of tailor-made chiral polymer microspheres exhibiting multifunctional properties, such as i) light-confinement, ii) NLO-CD, and iii) laser-driven optical emission shifts, useful for many optoelectronic and photonic device applications.
机译：具有光学非线性（NLO）的两种手性PI缀合的聚合物，通过R-和S-6,6'-Dibromo-2,2'-二乙氧基-1,1'共聚合制备R-和S-BP。 - 通过Sonogashira偶联的1,4-二乙炔基-2,5-双（辛氧基）苯的苯并萘基。 R-和S-BP共聚物在生产微球粒子的四氢呋喃/ H 2 O /乙醇混合物中自组装。值得注意的是，所获得的聚合物微球在一个和两光子激发的发光或双光子发光（TPL）中的耳语廊道模式共振（500-720nm）的激发，其具有高达700的质量因子（Q）。由于高Q值，单个（R-或S-BP）微球在TPL信号中显示圆形二中间效应（CD）效应。在高激光泵功率（> = 10mW）中，微球的TPL光谱特征显着变化，表明聚合物包装的改变。对于热或高功率连续波激光激发的微球观察到类似的光谱变化。将光致发光寿命成像显微镜下降到单个微球水平从j型聚合物包装的转化为J，H和H样（侧链有无序的侧链）类型。这项工作证明了量身定制的手性聚合物微球的巨大潜力，其表现出具有多功能性质，例如I）光限制，II）的激光驱动的光学发射移位，可用于许多光电和光子器件应用。

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