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Aggregation-induced emission from silole-based lumophores embedded in organic–inorganic hybrid hosts
Journal of Materials Chemistry C ( IF 6.4 ) Pub Date : 2021-09-16 , DOI: 10.1039/d1tc02794h
Guanpeng Lyu 1 , Thomas J F Southern 1 , Bethan L Charles 1 , Maxime Roger 2 , Philippe Gerbier 2 , Sébastien Clément 2 , Rachel C Evans 1
Affiliation  

Aggregation-induced emitters – or AIEgens – are often symbolised by their photoluminescence enhancement as a result of aggregation in a poor solvent. However, for some applications, it is preferable for the AIE response to be induced in the solid-state. Here, the ability of an organic–inorganic hybrid polymer host to induce the AIE response from embedded silole-based lumophores has been explored. We have focussed on understanding how the incorporation method controls the extent of lumophore aggregation and thus the associated photophysical properties. To achieve this, two sample concentration series have been prepared, based on either the parent AIEgen 1,1-dimethyl-2,3,4,5-tetraphenylsilole (DMTPS) or the silylated analogue (DMTPS-Sil), which were physically doped or covalently grafted, respectively, to dU(600) – a member of the ureasil family of poly(oxyalkylene)/siloxane hybrids. Steady-state and time-resolved photoluminescence measurements, coupled with confocal microscopy studies, revealed that covalent grafting leads to improved dispersibility of the AIEgen, reduced scattering losses, increased photoluminescence quantum yields (up to ca. 40%) and improved chemical stability. Moreover, the ureasil also functions as a photoactive host that undergoes excitation energy transfer to the embedded DMTPS-Sil with an efficiency of almost 70%. This study highlights the potential for designing complex photoluminescent hybrid polymers exhibiting an ehanced AIE response for solid-state optical applications.

中文翻译:

嵌入有机-无机杂化宿主中的基于硅酮的发光体的聚集诱导发射

聚集诱导发射体(或 AIEgens)通常以在不良溶剂中聚集导致的光致发光增强来表示。然而,对于某些应用,最好在固态下诱导 AIE 响应。在这里,已经探索了有机 - 无机杂化聚合物宿主从嵌入的基于硅酮的发光体诱导 AIE 响应的能力。我们专注于了解掺入方法如何控制荧光团聚集的程度,从而控制相关的光物理特性。为实现这一目标,基于物理掺杂的母体 AIEgen 1,1-二甲基-2,3,4,5-四苯基甲硅烷 (DMTPS) 或甲硅烷基化类似物 (DMTPS-Sil) 制备了两个样品浓度系列或共价接枝,分别,到 dU(600) – 聚(氧化烯)/硅氧烷杂化物的 ureasil 家族成员。稳态和时间分辨光致发光测量,加上共聚焦显微镜研究,表明共价接枝导致 AIEgen 的分散性提高,散射损失减少,光致发光量子产率增加(高达40%) 和改进的化学稳定性。此外,ureasil 还充当光活性宿主,其将激发能量转移到嵌入的 DMTPS-Sil 中,效率接近 70%。这项研究突出了设计复杂的光致发光杂化聚合物的潜力,该聚合物表现出用于固态光学应用的增强的 AIE 响应。
更新日期:2021-09-16
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