SINGLET-EXCITON TRANSPORT AND SPATIAL AND ENERGETIC DISORDER IN DIBENZOFURAN CRYSTALS

被引：11

作者：

FISCHER, U

VONBORCZYSKOWSKI, C

SCHWENTNER, N

机构：

[1] Institut F̈r Experimentalphysik, Freie Universität, Berlin, D-1000 Berlin 33

来源：

PHYSICAL REVIEW B | 1990年 / 41卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.41.9126

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The trap-depth distribution of dibenzofuran singlet excitons and the temperature-dependent energy migration and energy transfer to anthracene super traps has been studied by time-resolved spectroscopy via synchrotron radiation and two-photon laser excitation. The energy transport in the orientationally disordered dibenzofuran single crystals follows a stretched exponential behavior with 2=0.57 at temperatures above 150 K. Below this temperature 2 approaches zero. Spatial (fractal) disorder has been experimentally separated from energetic (temporal) disorder by applying the subordination principle. Spatial disorder indicates an aggregation of orientationally disordered molecules. The aggregates are described by the spectral (fracton) dimension ds=1.14 over the characteristic diffusion length. © 1990 The American Physical Society.

引用

页码：9126 / 9133

页数：8

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