Extremely low-voltage driving of organic light-emitting diodes with a Cs-doped phenyldipyrenylphosphine oxide layer as an electron-injection layer

Takahito Oyamada, Hiroyuki Sasabe, Chihaya Adachi, Seiichiro Murase, Tsuyoshi Tominaga, Chiharu Maeda

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

We demonstrated efficient electron injection and transport in organic light-emitting diodes using an electron-transport layer (ETL) composed of a Cs and phenyldipyrenylphosphine oxide (PO Py2) co-deposited layer. In particular, an ETL composed of a Cs:POPy2 layer with an atom:molar ratio of 1:2 demonstrated an extremely low driving voltage, resulting in a high current density of 100 mAcm2 at an applied voltage of only 3.9 V. The results of Kelvin probe and absorption measurements indicated that the formation of a CsAl alloy layer at the Cs:POPy2 /Al cathode interface and the charge-transfer complex between the Cs and POPy2 contributed to enhancing the efficiency of electron injection and transport, respectively.

Original languageEnglish
Article number033503
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number3
DOIs
Publication statusPublished - Jan 17 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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