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Enhanced Orientation of 1,3,5-Tris(1-Phenyl-1H-Benzimidazole-2-yl)Benzene by Light Irradiation during Its Deposition Evaluated by Displacement Current Measurement

Yuya TANAKA, Yuki TAZO, Hisao ISHII

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Summary :

In vacuum-deposited film composed of organic polar molecules, polarization charges appear on the film surface owing to spontaneous orientation of the molecule. Because its density (σpol) determines an amount of accumulation charge (σacc) in organic light-emitting diodes and output power in polar molecular-based vibrational energy generators (VEGs), control of molecular orientation is highly required. Recently, several groups have reported that dipole-dipole interaction between polar molecules induces anti-parallel orientation which does not contribute to σpol. In other words, perturbation inducing the attenuation of the dipole interaction is needed to enhance σpol. In this study, to investigate an effect of light irradiation on σpol, we prepared 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) film under illumination during its deposition, and evaluated the σacc in TPBi-based bilayer device, which equals to σpol. We found that the σacc was increased by light irradiation, indicating that average orientation of TPBi is enhanced. These results suggest that light irradiation during device fabrication is promising process for organic electronic devices including polar molecule-based VEGs.

Publication
IEICE TRANSACTIONS on Electronics Vol.E104-C No.6 pp.176-179
Publication Date
2021/06/01
Publicized
2020/12/08
Online ISSN
1745-1353
DOI
10.1587/transele.2020OMS0009
Type of Manuscript
BRIEF PAPER
Category

Authors

Yuya TANAKA
  Chiba University,PRESTO
Yuki TAZO
  Chiba University
Hisao ISHII
  Chiba University

Keyword