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

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

Research output: Contribution to journalArticle

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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

Fingerprint

Emission spectroscopy
Electronic structure
emission spectra
electronic structure
X rays
Molecules
Diamines
Excitation energy
Photovoltaic cells
photovoltaic cells
x ray spectra
Organic light emitting diodes (OLED)
Molecular orbitals
diamines
Absorption spectroscopy
x ray absorption
Transport properties
x ray spectroscopy
spectroscopy
Charge transfer

All Science Journal Classification (ASJC) codes

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

Cite this

Seo, J. H., Kim, C. Y., Kang, S. J., Yoo, K., 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
Seo, J. H. ; Kim, C. Y. ; Kang, S. J. ; Yoo, Kyung-hwa ; Whang, C. N. ; Moewes, A. ; Chang, G. S. / Electronic structure of NPB and BCP molecules probed by x-ray emission spectroscopy. In: Journal of Chemical Physics. 2007 ; Vol. 126, No. 6.
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Electronic structure of NPB and BCP molecules probed by x-ray emission spectroscopy. / Seo, J. H.; Kim, C. Y.; Kang, S. J.; Yoo, Kyung-hwa; Whang, C. N.; Moewes, A.; Chang, G. S.

In: Journal of Chemical Physics, Vol. 126, No. 6, 064706, 22.02.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Electronic structure of NPB and BCP molecules probed by x-ray emission spectroscopy

AU - Seo, J. H.

AU - Kim, C. Y.

AU - Kang, S. J.

AU - Yoo, Kyung-hwa

AU - Whang, C. N.

AU - Moewes, A.

AU - Chang, G. S.

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AB - 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.

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