Energy-level alignment at the tris-(8-hydroxyquinolate)-aluminum/Gd interface and Gd-electron-injection layer for organic electroluminescent device

Shin Cheul Kim, Soon Nam Kwon, Myung Woon Choi, Chung Nam Whang, Kwangho Jeong, Sam Hyeon Lee, Jae Gyoung Lee, Sunwook Kim

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The energy-level alignment for the tris-(8-hydroxyquinolate)-aluminum (Alq3)/Gd interface is determined by ultraviolet photoemission spectroscopy. The energy difference between the Fermi level in Gd and the low-energy edge of the highest occupied molecular orbital in Alq3 is 2.63 eV, and the vacuum level in the Alq3 layer is moved upward to 0.35 eV with respect to its intrinsic level. Gd/Al, Al:Li (0.1%), and Al were employed as a cathode for the organic electroluminescent device. Among these devices, the device with the Gd-electron-injection layer has operated at the lowest voltage.

Original languageEnglish
Pages (from-to)3726-3728
Number of pages3
JournalApplied Physics Letters
Issue number22
Publication statusPublished - 2001 Nov 26


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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