Unmasking electronic energy transfer of conjugated polymers by suppression of O2 quenching

被引:359
作者
Yu, J [1 ]
Hu, DH [1 ]
Barbara, PF [1 ]
机构
[1] Univ Texas, Dept Chem & Biochem, Austin, TX 78712 USA
关键词
D O I
10.1126/science.289.5483.1327
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
The photochemistry of poly[2-methoxy, 5-(2'-ethyl-hexyloxy)-p-phenylene-vinylene] (MEH-PPV) has been found to be highly dependent on the presence of O-2, which increases singlet exciton quenching dramatically, Spectroscopy on isolated single molecules of MEH-PPV in polycarbonate films that exclude O-2 reveals two distinct polymer conformations with fluorescence maxima near 555 and 580 nanometers wavelength, respectively. Time-resolved single-molecule data demonstrate that the 580-nanometer conformation exhibits a "landscape" for intramolecular electronic energy relaxation with a "funnel" that contains a 580-nanometer singlet exciton trap at the bottom. The exciton traps can be converted to exciton quenchers by reaction with O-2. Conformationally induced, directed-energy transfer is arguably a critical dynamical process that is responsible for many of the distinctive photophysical properties of conjugated polymers.
引用
收藏
页码:1327 / 1330
页数:4
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