Organic oxide/Al composite cathode in small molecular organic light-emitting diodes

Tzung Fang Guo, Fuh Shun Yang, Zen Jay Tsai, Ten Chin Wen, Ching In Wu, Chia Tin Chung

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


This study addresses the feasibility of using an organic oxide/Al composite cathode to fabricate the small molecular organic light-emitting diodes (OLEDs). A supplementary organic buffer film is placed at the interface between the tris(8-hydroxyquinoline) aluminum (Alq3) and the organic oxide/Al complex layers. Incorporating the rubrene/poly(ethylene glycol) dimethyl ether (PEGDE) buffer layers into the composite cathode structure markedly improves the performance of devices. The luminous efficiencies of Alq3-based OLEDs biased at ∼ 100 mA/cm2 are 4.8 and 5.1 cd/A for rubrene (50 Å)/PEGDE (15 Å)/Al and rubrene (50 Å)/PEGDE (15Å)/LiF (5 Å)/Al cathode devices, and 1.3 and 3.8 cd/A for devices with Al and LiF (5 Å)/Al cathodes, respectively.

Original languageEnglish
Article number053507
JournalApplied Physics Letters
Issue number5
Publication statusPublished - 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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