Room-Temperature Micron-Scale Exciton Migration in a Stabilized Emissive Molecular Aggregate

被引：104

作者：

Caram, Justin R. ^{[1
]}

Doria, Sandra ^{[1
]}

Eisele, Dorthe M. ^{[3
]}

Freyria, Francesca S. ^{[1
]}

Sinclair, Timothy S. ^{[1
]}

Rebentrost, Patrick ^{[2
]}

Lloyd, Seth ^{[2
]}

Bawendi, Moungi G. ^{[1
]}

机构：

[1] MIT, Dept Chem, Cambridge, MA 02139 USA

[2] MIT, Dept Mech Engn, Cambridge, MA 02139 USA

[3] CUNY City Coll, Dept Chem & Biochem, Ctr Discovery & Innovat, 160 Convent Ave, New York, NY 10031 USA

来源：

NANO LETTERS | 2016年 / 16卷 / 11期

基金：

美国国家科学基金会;

关键词：

J-aggregate; molecular aggregate; exciton; exciton diffusion; coherent exciton; exciton delocalization; QUANTUM COHERENCE; FLUORESCENCE; TRANSPORT; DYNAMICS; MODEL; FILMS;

D O I：

10.1021/acs.nanolett.6b02529

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report 1.6 +/- 1 mu m exciton transport in self-assembled supramolecular light-harvesting nanotubes (LHNs) assembled from amphiphillic cyanine dyes. We stabilize LHNs in a sucrose glass matrix, greatly reducing light and oxidative damage and allowing the observation of exciton-exciton annihilation signatures under weak excitation flux. Fitting to a one-dimensional diffusion model, we find an average exciton diffusion constant of 55 +/- 20 cm(2)/s, among the highest measured for an organic system. We develop a simple model that uses cryogenic measurements of static and dynamic energetic disorder to estimate a diffusion constant of 32 cm(2)/s, in agreement with experiment. We ascribe large exciton diffusion lengths to low static and dynamic energetic disorder in LHNs. We argue that matrix-stabilized LHNS represent an excellent model system to study coherent excitonic transport.

引用

页码：6808 / 6815

页数：8

共 37 条

[1] Visualization of exciton transport in ordered and disordered molecular solids [J].