2011
DOI: 10.1021/nl1033039
|View full text |Cite
|
Sign up to set email alerts
|

Enhancing Long-Range Exciton Guiding in Molecular Nanowires by H-Aggregation Lifetime Engineering

Abstract: Excitonic transitions in organic semiconductors are associated with large oscillator strength that limits the excited-state lifetime and can in turn impede long-range exciton migration. We present perylene-based emissive H-aggregate nanowires where the lowest energy state is only weakly coupled to the ground state, thus dramatically enhancing lifetime. Exciton migration occurs by thermally activated hopping, leading to luminescence quenching on topological wire defects. An atomic force microscope tip can intro… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1

Citation Types

1
119
0

Year Published

2012
2012
2022
2022

Publication Types

Select...
6
2

Relationship

3
5

Authors

Journals

citations
Cited by 132 publications
(120 citation statements)
references
References 30 publications
1
119
0
Order By: Relevance
“…9 Diffusion lengths exceeding 250 nm were recently attained for a PTCDI nanofiber at room temperature. 10 This length is much longer than those observed for conjugated polymers, usually in the range of a few nanometers. 7 The 1D enhanced exciton diffusion is consistent with the highly polarized emission observed for the same nanofiber; the latter is also directed along the π−π stacking.…”
Section: Accounts Of Chemical Researchmentioning
confidence: 90%
“…9 Diffusion lengths exceeding 250 nm were recently attained for a PTCDI nanofiber at room temperature. 10 This length is much longer than those observed for conjugated polymers, usually in the range of a few nanometers. 7 The 1D enhanced exciton diffusion is consistent with the highly polarized emission observed for the same nanofiber; the latter is also directed along the π−π stacking.…”
Section: Accounts Of Chemical Researchmentioning
confidence: 90%
“…133 Generally, H-type aggregates of PDIs have been demonstrated to be more suitable for optical applications than Jaggregates. 134 However, although π−π stacking can facilitate Chem. Rev.…”
Section: Linear Optoelectronicsmentioning
confidence: 99%
“…As discovered by Zang et al, 1D nanobelts of N,N′-dicyclohexyl-substituted PDI show persistent strong polarized and self-waveguided fluorescence emission arising from a socalled "flip-flap" stacking morphology. 131,134 Taking additional advantage of steric interactions of rigid p-tert-butylphenoxy substituents at the bay positions, a high electron mobility (1.8 cm 2 V −1 s −1 ) from needle crystals of TBPCHPDI ( Figure 25G,H) was observed, while maintaining strong red fluorescence with a quantum yield of 0.32. 135 The abovementioned work shed light on constructing future fluorescent devices through well-tailored structural design to control the intermolecular π−π interactions.…”
Section: Linear Optoelectronicsmentioning
confidence: 99%
“…However, the signatures of excitonic dimerization, or H-aggregation, are not always straightforward to resolve conclusively (24). H-aggregation should lead to a reduction in radiative rate (25). Typically, upon aggregation of P3HT, a strong decrease in fluorescence quantum yield is observed, but this is accompanied by an increase in fluorescence rate (26) because nonradiative decay rates are also enhanced.…”
mentioning
confidence: 99%