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Photoexcitation dynamics and energy engineering in supramolecular doping of organic conjugated molecules

Light(Science & Applications) 2023年第2期12卷 183-193页

作者： Xiang An Chuanxin Wei Lubing Bai Jun Zhou Le Wang Yamin Han lili Sun Jinyi Lin Heyuan Liu jiewei lil Man Xu Haifeng Ling Linghai Xie Wei Huang Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)30 South Puzhu RoadNanjing 211816China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts&Telecommunications9 Wenyuan RoadNanjing 210023China College of Science and Institute of New Energy China University of Petroleum(East China)Qingdao 266580China Shaanxi Institute of Flexible Electronics(SIFE) Northwestern Polytechnical University(NPU)127 West Youyi RoadXi'an 710072 ShaanxiChina

Doping and blending strategies are crucial means to precisely control the excited states and energy level in conjugated molecular ***,effective models and platforms are rarely proposed to systematically explore the effects of the formation of trapped doped centers on heterogeneous structures,energy level and ultrafast photophysical ***,for deeply understanding the impact of molecular doping in film energy levels and photoexcitation dynamics,we set a supramolecular N-B coordination composed by the conjugated molecules of pyridine functionalized diarylfluorene(host material),named as ODPF-Phpy and ODPF-(Phpy)2,and the molecule of tris(perfluorophenyl)borane(BCF)(guest material).The generation of the molecular-level coordination bond increased the binding energy of N atoms and tuned the band-gap,leading to a new fluorescent emission center with longer excitation wavelength and emission *** intermolecular Forster resonance energy transfer(FRET)in blending flms make it present inconsistent fluorescent behaviors compared to that in *** charge transfer(CT)state of N-B coordinated compounds and the changed dielectric constant of blending films resulted in a large PL spectra red-shift with the increased dopant ratio,causing a wide-tunable fluorescent *** excited state behaviors of two compounds in blending system was further investigated by the transient absorption(TA)***,we found supramolecular coordination blending can effectively improve the films'photoluminescence quantum yield(PLQY)and *** believe this exploration in the internal coordination mechanisms would deepen the insights about doped semiconductors and is helpful in developing novel high-efficient fluorescent systems.

关键词： spectroscopy. solution. excitation

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