Electronic structure of NPB and BCP molecules probed by x-ray emission spectroscopy

J. H. Seo, C. Y. Kim, S. J. Kang, K. H. Yoo, C. N. Whang, A. Moewes, G. S. Chang

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Abstract

Soft x-ray absorption and emission spectroscopies have been employed to investigate the electronic structure and chemical bonding of two prototypical molecules, N, N′ -bis-(1-naphthyl)- N, N′ -diphenyl- 1, 1′ -biphenyl- 4, 4′ -diamine (NPB) and bathocuproine (BCP), which are frequently chosen because of their hole-transporting and hole-blocking properties, respectively. The resulting resonant C Kα x-ray emission spectra of these materials reveal different spectral features depending on the resonant excitation energy. According to the N absorption and emission spectra, the contribution of N atoms to the highest occupied and lowest unoccupied molecular orbitals is different for in NPB and in BCP. Detailed knowledge of these materials will allow tailoring charge transport properties of organic devices in order to develop high performance organic light-emitting diodes and photovoltaic cells.

Original languageEnglish
Article number064706
JournalJournal of Chemical Physics
Volume126
Issue number6
DOIs
Publication statusPublished - 2007 Feb 22

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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    Seo, J. H., Kim, C. Y., Kang, S. J., Yoo, K. H., Whang, C. N., Moewes, A., & Chang, G. S. (2007). Electronic structure of NPB and BCP molecules probed by x-ray emission spectroscopy. Journal of Chemical Physics, 126(6), [064706]. https://doi.org/10.1063/1.2464086