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
相关论文
共 35 条
  • [21] Two-dimensional electronic excitations in self-assembled conjugated polymer nanocrystals
    Österbacka, R
    An, CP
    Jiang, XM
    Vardeny, ZV
    [J]. SCIENCE, 2000, 287 (5454) : 839 - 842
  • [22] Osterbacka R., 1999, PHYS REV B, V60, pR11253
  • [23] Conjugation length control in soluble poly[2-methoxy-5-((2′-ethylhexyl)oxy)-1,4-phenylenevinylene] (MEHPPV):: Synthesis, optical properties, and energy transfer
    Padmanaban, G
    Ramakrishnan, S
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2000, 122 (10) : 2244 - 2251
  • [24] FLUORESCENCE CORRELATIONS, SINGLE-MOLECULE DETECTION AND LARGE NUMBER SCREENING - APPLICATIONS IN BIOTECHNOLOGY
    RIGLER, R
    [J]. JOURNAL OF BIOTECHNOLOGY, 1995, 41 (2-3) : 177 - 186
  • [25] Picosecond time-resolved photoluminescence of PPV derivatives
    Samuel, IDW
    Rumbles, G
    Collison, CJ
    Friend, RH
    Moratti, SC
    Holmes, AB
    [J]. SYNTHETIC METALS, 1997, 84 (1-3) : 497 - 500
  • [26] INVESTIGATION OF ELECTRONIC COMMUNICATION IN MULTI-PORPHYRIN LIGHT-HARVESTING ARRAYS
    SETH, J
    PALANIAPPAN, V
    JOHNSON, TE
    PRATHAPAN, S
    LINDSEY, JS
    BOCIAN, DF
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1994, 116 (23) : 10578 - 10592
  • [27] Two-dimensional charge transport in self-organized, high-mobility conjugated polymers
    Sirringhaus, H
    Brown, PJ
    Friend, RH
    Nielsen, MM
    Bechgaard, K
    Langeveld-Voss, BMW
    Spiering, AJH
    Janssen, RAJ
    Meijer, EW
    Herwig, P
    de Leeuw, DM
    [J]. NATURE, 1999, 401 (6754) : 685 - 688
  • [28] TIME-RESOLVED PHOTOLUMINESCENCE FROM POLY[2-METHOXY, 5-(2'-ETHYL-HEXYLOXY)-P-PHENYLENE-VINYLENE] - SOLUTIONS, GELS, FILMS, AND BLENDS
    SMILOWITZ, L
    HAYS, A
    HEEGER, AJ
    WANG, G
    BOWERS, JE
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1993, 98 (08) : 6504 - 6509
  • [29] The molecular wire approach to sensory signal amplification
    Swager, TM
    [J]. ACCOUNTS OF CHEMICAL RESEARCH, 1998, 31 (05) : 201 - 207
  • [30] Discrete intensity jumps and intramolecular electronic energy transfer in the spectroscopy of single conjugated polymer molecules
    VandenBout, DA
    Yip, WT
    Hu, DH
    Fu, DK
    Swager, TM
    Barbara, PF
    [J]. SCIENCE, 1997, 277 (5329) : 1074 - 1077