瞬态吸收光谱法研究共轭聚合物的浓度依赖性链内和链间电荷转移动力学

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-09-24 DOI:10.1016/j.jlumin.2025.121572

Ruixiang Wu, Rongli Guo, Jiacheng Tang, Zhiliang Han, Shengzhi Wang, Bin Li, Xiangyang Miao

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引用次数: 0

摘要

共轭聚合物以其独特的光物理性质在有机光电器件领域显示出巨大的应用潜力。聚（2-甲氧基-5-（3′，7′-二甲基辛基氧基）-1,4-苯基乙烯基）（MDMO-PPV）在不同浓度下表现出不同的光致发光（PL）特性。在556 nm和592 nm处，可以调节链内和链间发射的两个PL分量。在低浓度MDMO-PPV的瞬态吸收光谱中，在524 nm以下和之后观察到基态漂白和受激发射特征。随着浓度的增加，基态漂白特征红移，表明带隙减小。在高浓度下，链内电荷转移被链间电荷转移所取代。链间发射的寿命由于电荷聚集而增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Concentration-dependent intra- and inter-chain charge transfer dynamics of conjugated polymers explored by transient absorption spectroscopy

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Concentration-dependent intra- and inter-chain charge transfer dynamics of conjugated polymers explored by transient absorption spectroscopy

Conjugated polymers exhibit significant application potential in the field of organic optoelectronic devices owing to their unique photophysical properties. Poly(2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene) (MDMO-PPV) presented a distinct photoluminescence (PL) emission at the different concentration. The two PL components of intra- and inter-chain emissions at 556 nm and 592 nm can be adjusted. Ground state bleaching and stimulated emission features were observed below and after 524 nm in the transient absorption spectrum of the low MDMO-PPV concentration. As the concentration increased, the ground state bleaching feature red-shifted, indicating a reduction of the band gap. At high concentrations, intra-chain charge transfer was substituted by the inter-chain charge transfer. The lifetime of inter-chain emission turned increased due to the charge aggregation.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.