芳烴-全氟芳烴相互作用改善圓偏振發光材料的綜合性能
作者:
小柯機器人發布時間:2020/11/29 21:48:55
國家納米科學中心Pengfei Duan課題組取得一項新突破。他們的研究開發出了通過芳烴-全氟芳烴相互作用提高圓偏振發光材料的整體性能。 這一研究成果於2020年11月25日發表在國際頂尖學術期刊《德國應用化學》上。
純有機材料作為圓偏振發光(CPL)材料,主要的取捨是較大的發光不對稱係數(g lum)通常會增加對發光效率(Φ PL)的抑制。該工作中,課題組首次報導了一超分子自組裝體系,由手性多環芳烴(PAHs)與八氟萘(OFN)的芳烴-全氟芳烴(AP)相互作用驅動,為這一問題提供了解決方案。以芘和蒽為基礎的兩種手性多環芳烴可以在雜化溶劑中與OFN協同組裝,形成長程有序的AP組裝件。
形態測量和螢光光譜驗證了AP相互作用驅動自組裝的詳細過程。AP組裝件不僅在激發態,而且在基態也顯示出手性放大。此外,由於OFN的能量勢壘效應,AP組件比單個手性多環芳烴具有更高的發光效率。目前基於AP相互作用的策略可用於促進高效CPL活性材料的開發。
附:英文原文
Title: Improving Overall Properties of Circularly Polarized Luminescent Materials through Arene‐Perfluoroarene Interaction
Author: Haowen Zhang, Jianlei Han, Xue Jin, Pengfei Duan
Issue&Volume: 25 November 2020
Abstract: A major trade‐off in the field of circularly polarized luminescence (CPL) of pure organic materials is that the large luminescence dissymmetry factor (g lum) usually give rise to the suppression of luminescence efficiency (Φ PL). Here, a supramolecular self‐assembled system, driven by arene‐perfluoroarene (AP) interaction of chiral polycyclic aromatic hydrocarbons (PAHs) and octafluoronaphthalene ( OFN ), was firstly reported to provide a solution to this problem. Two kinds of chiral PAHs based on pyrene and anthracene could co‐assemble with OFN in hybrid solvents to form long‐range ordered AP assemblies. The detailed process of AP interaction driving self‐assembly was verified by the morphological measurement and fluorescence spectra. The AP assemblies exhibited chirality amplification not only in the excited state but also in the ground state. In addition, the AP assemblies showed enhanced luminescence efficiency compared with the individual chiral PAHs due to the energy barrier effect of OFN . The present strategy based on AP interaction could be applied to boost the development of highly efficient CPL‐active materials.
DOI: 10.1002/anie.202014891
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202014891