Sensitized phosphorescence of benzil-doped ladder-type methyl-poly(para-phenylene)

被引:4
作者
Bagnich, SA
Bässler, H
Neher, D
机构
[1] Natl Acad Sci Belarus, Inst Atom & Mol Phys, Minsk 220072, BELARUS
[2] Univ Marburg, Inst Phys Kern & Makromol Chem, D-35032 Marburg, Germany
[3] Univ Marburg, Wissensch Zentrum Mat Wissensch, D-35032 Marburg, Germany
[4] Univ Potsdam, Inst Phys, D-14469 Potsdam, Germany
关键词
D O I
10.1063/1.1805518
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The delayed luminescence and phosphorescence of ladder-type methyl-poly(para-phenylene) (MeLPPP) doped with benzil at a concentration of 20% by weight has been measured. The introduction of benzil leads to a dramatic reduction of the polymer singlet emission. At the same time, a new band with maximum at 611 nm appears, corresponding to the phosphorescence of MeLPPP. The phosphorescence decay on the short time scale is close to an exponential law with a time decay of 15 ms. This indicates that benzil can efficiently sensitize the phosphorescence of the polymer. In addition, a broad and featureless emission is observed in the delayed luminescence spectra of benzil-doped MeLPPP, which is attributed to an exciplex formed between the polymer host and the dopant. We further observe that the delayed fluorescence is enhanced by the addition of benzil. It is concluded that the delayed fluorescence of benzil-doped MeLPPP is mainly due to the annihilation of triplet excitons on the polymer. Finally, efficient triplet-triplet energy transfer from the benzil-doped polymer to the red-emitting phosphorescent dye Pt(II)octaethylporphyrin is established. (C) 2004 American Institute of Physics.
引用
收藏
页码:9178 / 9183
页数:6
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