Transfer of photoenergy in pi-conjugated polymers. Two types of photoluminescence that involve energy transfer along a polymer chain

Takakazu Yamamoto; Bang-Lin Lee; Ismayil Nurulla; Takuma Yasuda; Isao Yamaguchi; Akihide Wada; Chiaki Hirose; Mitsuo Tasumi; Akira Sakamoto; Eiji Kobayashi

doi:10.1021/jp040624h

Transfer of photoenergy in pi-conjugated polymers. Two types of photoluminescence that involve energy transfer along a polymer chain

J Phys Chem B. 2005 Jun 2;109(21):10605-10. doi: 10.1021/jp040624h.

Authors

Takakazu Yamamoto¹, Bang-Lin Lee, Ismayil Nurulla, Takuma Yasuda, Isao Yamaguchi, Akihide Wada, Chiaki Hirose, Mitsuo Tasumi, Akira Sakamoto, Eiji Kobayashi

Affiliation

¹ Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan.

PMID: 16852287
DOI: 10.1021/jp040624h

Abstract

Two types of energy transfer in pi-conjugated polymers have been investigated using time-resolved photoluminescence (PL) techniques: type i, perpendicular-type energy transfer from the 2,3-di(p-tolyl)quinoxaline unit to the pi-conjugated main chain of poly[2,3-di(p-tolyl)quinoxaline-5,8-diyl], and type ii, parallel-type energy transfer from the oligo(pyridine-2,5-diyl) (O-Py) unit to the oligo(selenophene-2,5-diyl) (O-Se) unit in a block-type copolymer of O-Py and O-Se. Both types of energy transfer were very fast with a time constant shorter than approximately 0.1 ns; in particular, the type ii energy transfer took place with a time constant of approximately 5 ps. Both pi-conjugated polymers were considered to contain segments with various effective pi-conjugation lengths, and the energy transfer to the segment with a larger effective pi-conjugation length and a smaller pi-pi* transition energy required a longer transition time. A polarizing film was obtained by utilizing the perpendicular-type energy transfer.