title: [XPS spectra of Langmuir-Blodgett films and their electroluminescence].
abstract: The coordination of monolayer of amphiphilic ligands, N, N-bis(8-quinolinyl)alkyl propanediamide, H2A(alkyl = dodecyl, H2A12; hexadecyl, H2A16) with Cu2+ at air-water interface was investigated by X-ray Photoelectron Spectroscopy (XPS) and UV-Vis spectra. The collapse pressure of the monolayers of H2A12 and H2A16 increased from 12.5 and 15.6 mN x m(-1) to 28.0 and 33.8 mN x m(-1) after their coordination with Cu2+ ions, respectively. XPS indicated that the coordination ratio between H2A and Cu2+ was 1:1. The binding energies of Cu2p were 935 and 955 eV. The Langmuir-Blodgett(LB) films of H2A12 and H2A16 can be used as transporting materials in three-layer electroluminescence devices: ITO/TPD/LB films/Alq3/Al. The driving voltages were 6.5 and 7.5 V, the maximum luminances were 621 and 201 cd x m(-2), respectively.
authors.affiliation: Department of Chemistry, Ji'nan University, Guangzhou 510632, China.
authors.forename: Jian-ming
authors.initials: JM
authors.lastname: Ouyang
authors.forename: Yu
authors.initials: Y
authors.lastname: Bai
authors.forename: Gui
authors.initials: G
authors.lastname: Yu
authors.forename: Shi
authors.initials: S
authors.lastname: Wang
authors.forename: Yun-qi
authors.initials: YQ
authors.lastname: Liu
authors.forename: Yong-fang
authors.initials: YF
authors.lastname: Li
authors.forename: Dao-ben
authors.initials: DB
authors.lastname: Zhu