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Relationship between Crystalline Order and Exciton Diffusion Length in Molecular Organic Semiconductors
Author(s) -
Lunt Richard R.,
Benziger Jay B.,
Forrest Stephen R.
Publication year - 2010
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200902827
Subject(s) - materials science , diffusion , exciton , organic semiconductor , amorphous solid , crystal (programming language) , quantum yield , semiconductor , chemical physics , crystallography , condensed matter physics , fluorescence , optoelectronics , optics , thermodynamics , chemistry , physics , computer science , programming language
The effect of crystalline order on the exciton diffusion length ( L D ) is shown for the archetypal organic semiconductor 3,4,9,10‐perylenetetracarboxylic dianhydride (PTCDA; see figure). L D increases from ∼6.5 nm in the amorphous limit to ∼25 nm for single crystals. These changes in diffusion length are connected to changes in the fluorescence quantum yield, which is useful for understanding where crystal‐size‐dependant diffusion trends are likely to be observed for other organic materials.