Willis-Fox Niamh, Marques Ana-Teresa, Arlt Jochen, Scherf Ullrich, Carlos Luís D, Burrows Hugh D, Evans Rachel C
School of Chemistry and CRANN , Trinity College , The University of Dublin , Dublin 2 , Ireland . Email:
Makromolekulare Chemie , Bergische Universität Wuppertal , 42097 Wuppertal , Germany.
Chem Sci. 2015 Dec 1;6(12):7227-7237. doi: 10.1039/c5sc02409a. Epub 2015 Sep 17.
Poly(fluorene) conjugated polyelectrolyte (CPE)-di-ureasil organic-inorganic composites have been prepared using a versatile sol-gel processing method, which enables selective localisation of the CPE within the di-ureasil matrix. Introduction of the CPE during the sol-gel reaction leads to a homogeneous distribution of the CPE throughout the di-ureasil, whereas a post-synthesis solvent permeation route leads to the formation of a confined layer of the CPE at the di-ureasil surface. The CPE and the di-ureasil both function as photoactive components, contributing directly to, and enhancing the optical properties of their composite material. The bright blue photoluminescence exhibited by CPE-di-ureasils is reminiscent of the parent CPE; however the distinct contribution of the di-ureasil to the steady-state emission profile is also apparent. This is accompanied by a dramatic increase in the photoluminescence quantum yield to >50%, which is a direct consequence of the synergy between the two components. Picosecond time-correlated single photon counting measurements reveal that the di-ureasil effectively isolates the CPE chains, leading to emissive trap sites which have a high radiative probability. Moreover, intimate mixing of the CPE and the di-ureasil, coupled with their strong spectral overlap, results in efficient excitation energy transfer from the di-ureasil to these emissive traps. Given the simple, solution-based fabrication method and the structural tunability of the two components, this approach presents an efficient route to highly desirable CPE-hybrid materials whose optoelectronic properties may be enhanced and tailored for a targeted application.
聚芴共轭聚电解质（CPE）-双脲硅有机-无机复合材料已通过一种通用的溶胶-凝胶加工方法制备而成，该方法能够使CPE在双脲硅基质中选择性定位。在溶胶-凝胶反应过程中引入CPE会导致CPE在整个双脲硅中均匀分布，而合成后溶剂渗透途径则会导致在双脲硅表面形成一层受限的CPE层。CPE和双脲硅均作为光活性组分，直接对其复合材料的光学性质做出贡献并增强这些性质。CPE-双脲硅所呈现的亮蓝色光致发光让人联想到母体CPE；然而，双脲硅对稳态发射谱的独特贡献也很明显。这伴随着光致发光量子产率急剧增加至>50%，这是两种组分协同作用的直接结果。皮秒时间相关单光子计数测量表明，双脲硅有效地隔离了CPE链，导致具有高辐射概率的发射陷阱位点。此外，CPE和双脲硅的紧密混合，加上它们强烈的光谱重叠，导致从双脲硅到这些发射陷阱的有效激发能量转移。鉴于这种基于溶液的简单制造方法以及两种组分的结构可调性，这种方法为制备高度理想的CPE杂化材料提供了一条有效途径，其光电性质可以得到增强并针对特定应用进行定制。
