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Issue 48, 2015
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High rectification in organic diodes based on liquid crystalline phthalocyanines

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Abstract

The optical and electrical properties of mesogenic metal-free and metalated phthalocyanines (PCs) with a moderately sized and regioregular alkyl periphery were investigated. In solution, the individualized molecules show fluorescence lifetimes of 4–6 ns in THF. When deposited as solid thin films the materials exhibit significantly shorter fluorescence lifetimes with bi-exponential decay (1.4–1.8 ns; 0.2–0.4 ns) that testify to the formation of aggregates via π–π intermolecular interactions. In diode structures, their pronounced columnar order outbalances the unfavorable planar alignment and leads to excellent rectification behavior. Field-dependent charge carrier mobilities are obtained from the JV curves in the trap-limited space-charge-limited current regime and demonstrate that the metalated PCs display an improved electrical response with respect to the metal-free homologue. The excited-state lifetime characterization suggest that the π–π intermolecular interactions are stronger for the metal-free PC, confirming that the metallic centre plays an important role in the charge transport inside these materials.

Graphical abstract: High rectification in organic diodes based on liquid crystalline phthalocyanines

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Supplementary files

Article information


Submitted
18 Sep 2015
Accepted
09 Nov 2015
First published
11 Nov 2015

Phys. Chem. Chem. Phys., 2015,17, 32390-32397
Article type
Paper

High rectification in organic diodes based on liquid crystalline phthalocyanines

P. Apostol, J. Eccher, M. E. R. Dotto, C. B. Costa, T. Cazati, E. A. Hillard, H. Bock and I. H. Bechtold, Phys. Chem. Chem. Phys., 2015, 17, 32390
DOI: 10.1039/C5CP05582B

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