Organic oxide/Al composite cathode in efficient polymer light-emitting diodes

Tzung Fang Guo, Fuh Shun Yang, Zen Jay Tsai, Ten Chin Wen, Sung Nien Hsieh, Yaw Shyan Fu, Chia Tin Chung

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

This work presents the fabrication of efficient polymer light-emitting diodes (PLEDs) by thermally evaporating a salt-free neutral organic-oxide buffer layer onto the surface of the electroluminescent film in a vacuum before the device cathode, made of Al - rather than the low work function metals, such as Ca or Ba - is deposited. The electroluminescence (EL) efficiency of phenyl-substituted poly(para-phenylene vinylene) copolymer-based PLEDs with an organic oxide/Al composite cathode, reaches 8.86 cd/A, which is markedly higher than those, 5.26 cd/A and 0.11 cd/A, of devices with Ca/Al and Al cathodes, respectively. The device performance is improved by the formation of a specific organic oxide/Al complex at the cathode interface during the deposition of Al, facilitating the injection of electrons and eliminating the metal-induced quenching sites of luminescence in the EL layer near the recombination region.

Original languageEnglish
Article number113501
JournalApplied Physics Letters
Volume88
Issue number11
DOIs
Publication statusPublished - 2006 Mar 30

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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