The triplet state of the ladder-type methyl-poly(p-phenylene) as seen by pulse radiolysis-energy transfer

被引：33
|
作者：
Monkman, AP [1 ]
Burrows, HD
Hamblett, I
Navaratnam, S
Scherf, U
Schmitt, C
机构：
[1] Univ Durham, Dept Phys, Durham DH1 3LE, England
[2] Univ Coimbra, Dept Quim, P-3049 Coimbra, Portugal
[3] Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England
[4] NE Wales Inst, Multidisciplinary Res & Innovat Ctr, Wrexham LL11 2AW, Wales
[5] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
来源：
CHEMICAL PHYSICS LETTERS | 2000年 / 327卷 / 1-2期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1016/S0009-2614(00)00845-9
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 lowest triplet state of a ladder poly(p-phenylene) (MeLPPP) has been produced by sensitised energy transfer following pulse radiolysis of benzene solution, and absorbs at 1.34 eV with a lifetime greater than or equal to 170 mu s. An S-0-T-1 energy separation of 2.15 +/- 0.07 eV was determined, in excellent agreement with recent phosphorescence measurements, confirming the validity of the technique for the determination of the triplet energies of conjugated polymers. At high triplet populations intrachain triplet-triplet annihilation (TTA), leading to delayed fluorescence (DF) occurs. The DF spectrum is in good agreement with the prompt fluorescence and the DF kinetics support a TTA mechanism. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：111 / 116
页数：6
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