Conjugated Polymer Blend Microspheres for Efficient, Long-Range Light Energy Transfer
Conjugated Polymer Blend Microspheres for Efficient, Long-Range Light Energy Transfer
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DOI：
10.1021/acsnano.6b02100
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发表时间：
2016-05-01
期刊：
影响因子：
17.1
通讯作者：
Yamamoto, Yohei
中科院分区：
文献类型：
--
作者：
Kushida, Soh;Braam, Daniel;Yamamoto, Yohei
通过供能和供能聚合物及其共混物的自组装制备了高发光的x共轭聚合物微球。为了避免宏观相分离，适当调整了溶液中每种聚合物的成核时间和生长速率。光致发光（PL）研究表明，微球内部发生了有效的供体到受体的能量转移，表明两种聚合物在微球中混合良好。聚焦激光照射单个微球激发低语走廊模式（WGMs），其中球内产生的PL被限制并产生共振。通过改变混合比例，PL线的波长被微调，伴随着系统的黄到红的颜色变化。此外，当几个微球线性耦合时，受限的PL通过接触点传播微球，并且级联式过程在保持WGM特性的同时转换PL颜色。高度可混溶聚合物共混物的自组装策略将有利于光电和光子器件的应用。
Highly luminescent x-conjugated polymeric micro spheres were fabricated through self-assembly of energy-donating and energy-accepting polymers and their blends. To avoid macroscopic phase separation, the nucleation time and growth rate of each polymer in the solution were properly adjusted. Photoluminescence (PL) studies showed that efficient donor-to-acceptor energy transfer takes place inside the microspheres, revealing that two polymers are well-blended in the microspheres. Focused laser irradiation of a single microsphere excites whispering gallery modes (WGMs), where PL generated inside the sphere is confined and resonates. The wavelengths of the PL lines are finely tuned by changing the blending ratio, accompanying the systematic yellow-to-red color change. Furthermore, when several microspheres are coupled linearly, the confined PL propagates the microspheres through the contact point, and a cascade-like process converts the PL color while maintaining the WGM characteristics. The self-assembly strategy for the formation of polymeric nano- to microstructures with highly miscible polymer blends will be advantageous for opto electronic and photonic device applications.