Room-Temperature Phosphorescence From Films of Isolated Water-Soluble Conjugated Polymers in Hydrogen-Bonded Matrices
Room-Temperature Phosphorescence From Films of Isolated Water-Soluble Conjugated Polymers in Hydrogen-Bonded Matrices
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DOI：
10.1002/adfm.201200814
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发表时间：
2012-09-25
影响因子：
19
通讯作者：
Monkman, Andrew P.
中科院分区：
文献类型：
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作者：
Al-Attar, Hameed A.;Monkman, Andrew P.
众所周知，与稀溶液相比，固态发光共轭聚合物的光致发光量子产率（PLQY）损失严重。这是由于激子在固体中的有效迁移，这使得激子很容易找到低能量的淬火点。本文报道了一种用致密排列的非相互作用发光聚合物链制备固体薄膜的新方法，该方法可以产生非常高的PLQY和更惊人的室温磷光。使用水溶性共轭聚合物（WSCP）和聚合表面活性剂，如聚乙烯醇（PVA）和聚乙烯基吡咯烷酮（PVP），可以生产出wt%为1:1或更高的WSCP薄膜，并显示室温磷光；这种行为以前从未观察到过，清楚地表明，在这些宿主中可以实现非常高程度的链隔离。PVA或PVP不仅作为有效的表面活性剂破坏了溶液中的WSCP聚集体，干燥时PVA-PVA或PVP-PVP形成的氢键锁住了WSCP的隔离，避免了分离，并使这些聚合物/聚合物纳米混合物具有长时间的稳定性。该方法被发现适用于各种各样的wscp。
It is well known that luminescent conjugated polymers suffer serious loss of photoluminescence quantum yield (PLQY) in the solid state compared to dilute solution. This is due to efficient exciton migration in the solid, which enables the excitons to readily find low energy quenching sites. Here a new method to fabricate solid films with densely packed non-interacting luminescent polymer chains, which yield very high PLQY and more astonishingly room temperature phosphorescence, is reported. Using water-soluble conjugated polymers (WSCP) and polymeric surfactants such as poly(vinyl alcohol) (PVA) and poly(vinyl-pyrrolidone) (PVP), films at 1:1 wt% or higher WSCP are produced and show room temperature phosphorescence; such behavior has never been observed before and clearly shows the very high degree of chain isolation that can be achieved in these hosts. The PVA or PVP not only breaks up WSCP aggregates in solution as an effective surfactant, PVA-PVA or PVP-PVP hydrogen bond formation upon drying locks in the isolation of the WSCP, avoiding segregation and yielding long time stability to these polymer/polymer nanomixtures. The method is found to work with a wide variety of WSCPs.