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Structure-charge transfer property relationship in self-assembled discotic liquid-crystalline donor-acceptor dyad and triad thin films

Title
Structure-charge transfer property relationship in self-assembled discotic liquid-crystalline donor-acceptor dyad and triad thin films
Authors
Lee, Kwang JinWoo, Jae HeunXiao, YimingKim, EunsunMazur, Leszek MateuszKreher, DavidAttias, Andre-JeanMatczyszyn, KatarzynaSamoc, MarekHeinrich, BenoitMery, StephaneFages, FredericMager, LoicD'Aleo, AnthonyWu, Jeong WeonMathevet, FabriceAndre, PascalRibierre, Jean-Charles
Ewha Authors
우정원Jean Charles Ribierre
SCOPUS Author ID
우정원scopus
Issue Date
2016
Journal Title
RSC ADVANCES
ISSN
2046-2069JCR Link
Citation
vol. 6, no. 63, pp. 57811 - 57819
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCIE; SCOPUS WOS scopus
Abstract
The photophysical properties of donor-acceptor (D-A) and donor-acceptor-donor (D-A-D) liquid crystalline dyads and triads based on two different discotic mesogens are examined in thin films by steady-state optical spectroscopy and subpicosecond transient absorption measurements. In these systems, triphenylene and perylene bisimide units are covalently linked by flexible decyloxy chain(s) and act as an electron donor (D) and acceptor (A), respectively. These discotic liquid-crystalline systems form well-separated D and A pi-stacked columnar structures in thin films. The absorption spectra of the films indicate an aggregation of the perylene bisimide and triphenylene moieties along the columns. Steady-state photoluminescence measurements show a strong fluorescence quenching that is mainly attributed to a photo-induced charge transfer process taking place between the triphenylene and perylene bisimide units. Subpicosecond transient absorption measurements show that the photoinduced charge transfer (CT) states in the dyad and triad films are formed within 0.3 ps and recombine on a 150-360 ps time scale. In addition, a correlation between the dynamics of the charge recombination process and the spacing distances between D and A units can be established in the dyad and triad films. This study provides important information on the relationship between molecular packing and the charge transfer properties in such self-organized D and A columnar nanostructures.
DOI
10.1039/c6ra08039a
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자연과학대학 > 물리학전공 > Journal papers
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