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- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국진공학회(ASCT) Journal of Korean Vacuum Science & Technology Journal of Korean Vacuum Science & Technology Vol.4 No.1
- 발행연도
- 2000.3
- 수록면
- 1 - 5 (5page)
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The C 1s photoelectron energy loss spectra of tris (8-hydroxy-quinoline) aluminum (Alq₃) and N,N'-diphenyl-N,N'-bis (3-methyl phenyl)-1,1'-bi-phenyl-4,4'-diamine (TPD) thin films have been investigated. Two major loss structures, namely the plasmon dominated loss lines and shake-up satellites, have been observed. The shake-up spectrum of the C 1s photoelectron line is directly related to the π-π* energy gap of the molecule which plays an important role in organic electroluminescent materials. The molecular orbitals of Alq₃ and TPD and their major components, quinoline and benzene, have been calculated with the AM1 semi-empirical method. The amount of the plasma-dominated loss of Alq₃ and TPD, which has to do with the delocalization of electrons through the molecule, was about 24 eV, alike in both cases. The main peak of the C 1s shake-up spectrum of Alq₃ and TPD, however, was 5.2 eV and 6.8 eV, respectively. It was found that the main shake-up peak reflects more the local π→π* transition of quinoline and benzene component rather than the excitation of the whole molecule of Alq₃ and TPD. The C 1s shake-up spectra, however, revealed some correlation with the optical energy gap of the organic electroluminescent materials.
목차
Abstract
Ⅰ. Introduction
Ⅱ. Experiment and Calculation
Ⅲ. Results and Discussion
Ⅳ. Conclusions
Acknowledgments
References
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