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

doi:10.1063/1.1852707

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 journal › Article › peer-review

87 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 language	English
Article number	033503
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	3
DOIs	https://doi.org/10.1063/1.1852707
Publication status	Published - Jan 17 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1852707

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Extremely low-voltage driving of organic light-emitting diodes with a Cs-doped phenyldipyrenylphosphine oxide layer as an electron-injection layer. / Oyamada, Takahito; Sasabe, Hiroyuki; Adachi, Chihaya; Murase, Seiichiro; Tominaga, Tsuyoshi; Maeda, Chiharu.

In: Applied Physics Letters, Vol. 86, No. 3, 033503, 17.01.2005, p. 1-3.

Research output: Contribution to journal › Article › peer-review

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AU - Murase, Seiichiro

AU - Tominaga, Tsuyoshi

AU - Maeda, Chiharu

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AB - 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.

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

Abstract

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