Ultralong-Range Polaron-Induced Quenching of Excitons in Isolated Conjugated Polymers

被引:113
作者
Bolinger, Joshua C. [1 ]
Traub, Matthew C. [1 ]
Adachi, Takuji [1 ]
Barbara, Paul F. [1 ]
机构
[1] Univ Texas Austin, Ctr Nano & Mol Sci & Technol, Austin, TX 78712 USA
关键词
SINGLE-MOLECULE SPECTROSCOPY; ENERGY MIGRATION; MEH-PPV; STATES; CHAIN;
D O I
10.1126/science.1199140
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In conjugated polymers, radiative recombination of excitons (electron-hole pairs) competes with nonradiative thermal relaxation pathways. We visualized exciton quenching induced by hole polarons in single-polymer chains in a device geometry. The distance-scale for quenching was measured by means of a new subdiffraction, single-molecule technique-bias-modulated intensity centroid spectroscopy-which allowed the extraction of a mean centroid shift of 14 nanometers for highly ordered, single-polymer nanodomains. This shift requires energy transfer over distances an order of magnitude greater than previously reported for bulk conjugated polymers and far greater than predicted by the standard mechanism for exciton quenching, the unbiased diffusion of free excitons to quenching sites. Instead, multistep "energy funneling" to trapped, localized polarons is the probable mechanism for polaron-induced exciton quenching.
引用
收藏
页码:565 / 567
页数:4
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