지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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Tris(8-quinolinolato)aluminum(Ⅲ); Alq<SUB>3</SUB> has been frequently used as an electron transporting layer in organic light-emitting diodes. Either Ba with a low work function or Au with a high work function was deposited on Alq<SUB>3</SUB> layer in vacuum. And then, the behaviors of electron transition at the Alq<SUB>3</SUB>/Ba and Alq<SUB>3</SUB>/Au interfaces were investigated by using the near edge x-ray absorption fine structure (NEXAFS) spectroscopy. In the each interface, the energy levels of unoccupied obitals were assigned as π<SUP>*</SUP>(LUMO, LUMO+1, LUMO+2 and LUMO+3) and σ<SUP>*</SUP>. And the relative intensities of these peaks were investigated. In an oxygen atom composing Alq<SUB>3</SUB> molecule, the relative intensities for a transition from K-edge to LUMO+2 were largely increased as Ba coverage (Θ<SUB>Ba</SUB>, 2.7 eV) with a low work function was in-situ sequentially increased on Alq<SUB>3</SUB> layer. In contrast, the relative intensities for the LUMO+2 peak were reduced as Au coverage (Θ<SUB>Au</SUB>, 5.1 eV) with a high work function were increased on Alq<SUB>3</SUB> layer. This means that the electron transition by photon in oxygen atom which consists in the unoccupied orbitals in Alq<SUB>3</SUB> molecule, largely depends on work function of a metal. Meanwhile, in the case of electron transition in a carbon atom, as Θ<SUB>Ba</SUB> was increased on Alq<SUB>3</SUB>, the relative intensity from K-edge to π<SUB>1</SUB><SUP>*</SUP>
(LUMO and LUMO+1) was slightly decreased, and from K-edge to π<SUB>2</SUB><SUP>*</SUP> (LUMO+2 and LUMO+3) was somewhat increased. This rising of the energy state from π<SUB>1</SUB><SUP>*</SUP> to π<SUB>2</SUB><SUP>*</SUP> exhibits that electrons provided by Ba would contribute to the process of electron transition in the Alq<SUB>3</SUB>/Ba interfaces. As shown in above observation, the analyses of NEXAFS spectra in each interface could be important as a basic data to understand the process of electron transition by photon in pure organic materials.
(LUMO and LUMO+1) was slightly decreased, and from K-edge to π<SUB>2</SUB><SUP>*</SUP> (LUMO+2 and LUMO+3) was somewhat increased. This rising of the energy state from π<SUB>1</SUB><SUP>*</SUP> to π<SUB>2</SUB><SUP>*</SUP> exhibits that electrons provided by Ba would contribute to the process of electron transition in the Alq<SUB>3</SUB>/Ba interfaces. As shown in above observation, the analyses of NEXAFS spectra in each interface could be important as a basic data to understand the process of electron transition by photon in pure organic materials.
목차
Abstract
1. 서론
2. 실험 방법
3. 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2013-581-001528651