The origin of the delayed emission in films of a ladder-type poly(para-phenylene)

被引：35

作者：

Hertel, D

Romanovskii, YV

Schweitzer, B

Scherf, U

Bässler, H

机构：

[1] Univ Marburg, Ctr Mat Sci, Inst Phys Nucl & Macromol Chem, D-35032 Marburg, Germany

[2] Russian Acad Sci, Inst Spect, Troitsk 142092, Russia

[3] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

SYNTHETIC METALS | 2001年 / 116卷 / 1-3期

关键词：

conjugated polymers; delayed fluorescence; phosphorescence;

D O I：

10.1016/S0379-6779(00)00473-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the observation of delayed fluorescence (DF) and phosphorescence (P) from films of the ladder-type poly(para-phenylene) (MeLPPP). Upon pulsed optical excitation into the Si <-- S-0 transition of the MeLPPP, delayed emission occurs on a rime scale of <mu>s to ms. The DF varies linearly with pump light intensity, while the phosphorescence shows a sublinear intensity dependence. We will argue that singlet-singlet (SS) annihilation is responsible for the sublinear phosphorescence intensity (P-int) dependence, since the intensity dependence of the prompt fluorescence shows the same behaviour above excitation intensities of 1 muJ/pulse. Both, DF and P decay according to a power law. The data analysis reveals that the DF is caused by recombination of geminate electron hole pairs rather than triplet-triplet (TT) annihilation. This conclusion is supported by investigations of the response of the DF to an applied electric field. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：139 / 143

页数：5

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