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

Xiang An; Chuanxin Wei; Lubing Bai; Jun Zhou; Le Wang; Yamin Han; Lili Sun; Jinyi Lin; Heyuan Liu; Jiewei Li; Man Xu; Haifeng Ling; Linghai Xie; Wei Huang

doi:10.1038/s41377-022-01062-6

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

Original Articles

- Photoexcitation dynamics and energy engineering in supramolecular doping of organic conjugated molecules
- Photoexcitation dynamics and energy engineering in supramolecular doping of organic conjugated molecules
- 光：科学与应用 2023年12卷第2期页码：183-193
- Affiliations：
  
  1.Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
  2.State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing, 210023, China
  3.College of Science and Institute of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
  4.Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an, 710072, Shaanxi, China
- Author bio：
  
  Jinyi Lin (iamjylin@njtech.edu.cn)
  Wei Huang (wei-huang@njtech.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-01062-6
  中图分类号：
- 纸质出版日期：2023-2-28，
  
  网络出版日期：2023-1-31，
  
  收稿日期：2022-8-11，
  
  修回日期：2022-12-15，
  
  录用日期：2022-12-15
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Photoexcitation dynamics and energy engineering in supramolecular doping of organic conjugated molecules[J]. 光：科学与应用, 2023,12(2):183-193.

An, X. et al. Photoexcitation dynamics and energy engineering in supramolecular doping of organic conjugated molecules. Light: Science & Applications, 12, 183-193 (2023).
Photoexcitation dynamics and energy engineering in supramolecular doping of organic conjugated molecules[J]. 光：科学与应用, 2023,12(2):183-193. DOI： 10.1038/s41377-022-01062-6.

An, X. et al. Photoexcitation dynamics and energy engineering in supramolecular doping of organic conjugated molecules. Light: Science & Applications, 12, 183-193 (2023). DOI： 10.1038/s41377-022-01062-6.

摘要

Abstract

Doping and blending strategies are crucial means to precisely control the excited states and energy level in conjugated molecular systems. However

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 process. Herein

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)

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 wavelength. The intermolecular Förster resonance energy transfer (FRET) in blending films make it present inconsistent fluorescent behaviors compared to that in solution. The 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 color. The excited state behaviors of two compounds in blending system was further investigated by the transient absorption (TA) spectroscopy. Finally

we found supramolecular coordination blending can effectively improve the films' photoluminescence quantum yield (PLQY) and conductivity. We 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

Keywords

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