Correlation of energy band alignment and turn-on voltage in organic light emitting diodes

I. Wen Wu; Yu Hung Chen; Po Sheng Wang; Chao Gong Wang; Shu Han Hsu; Chih I. Wu

doi:10.1063/1.3282682

Correlation of energy band alignment and turn-on voltage in organic light emitting diodes

I. Wen Wu
, Yu Hung Chen
, Po Sheng Wang
, Chao Gong Wang
, Shu Han Hsu
, Chih I. Wu

Department of Computer Science and Information Engineering

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

23 Citations (Scopus)

Abstract

The correlation of energy alignment and turn-on voltage of organic light emitting diodes (OLEDs) was investigated. With identical hole transport layers (HTLs) and electron transport layers (ETLs), the turn-on voltages of OLEDs are always the same, regardless of the cathode structures, such as Ca, Al, LiF/Al, and Cs₂ CO₃ /Al. For devices with various combinations of HTLs and ETLs, the turn-on voltages are equal to the energy difference between the lowest unoccupied molecular orbital of ETLs and the highest occupied molecular orbital of HTLs, taking into consideration of vacuum level shift at organic interfaces measured from ultraviolet photoemission spectroscopy.

Original language	English
Article number	013301
Journal	Applied Physics Letters
Volume	96
Issue number	1
DOIs	https://doi.org/10.1063/1.3282682
Publication status	Published - 2010

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3282682

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title = "Correlation of energy band alignment and turn-on voltage in organic light emitting diodes",

abstract = "The correlation of energy alignment and turn-on voltage of organic light emitting diodes (OLEDs) was investigated. With identical hole transport layers (HTLs) and electron transport layers (ETLs), the turn-on voltages of OLEDs are always the same, regardless of the cathode structures, such as Ca, Al, LiF/Al, and Cs2 CO3 /Al. For devices with various combinations of HTLs and ETLs, the turn-on voltages are equal to the energy difference between the lowest unoccupied molecular orbital of ETLs and the highest occupied molecular orbital of HTLs, taking into consideration of vacuum level shift at organic interfaces measured from ultraviolet photoemission spectroscopy.",

author = "Wu, \{I. Wen\} and Chen, \{Yu Hung\} and Wang, \{Po Sheng\} and Wang, \{Chao Gong\} and Hsu, \{Shu Han\} and Wu, \{Chih I.\}",

note = "Funding Information: This work is supported by National Science Councils (Grant No. NSC95-2112-M-002-043-MY3) and “Aim for Top University Project” from the Ministry of Education, Republic of China.",

year = "2010",

doi = "10.1063/1.3282682",

language = "English",

volume = "96",

journal = "Applied Physics Letters",

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T1 - Correlation of energy band alignment and turn-on voltage in organic light emitting diodes

AU - Wu, I. Wen

AU - Chen, Yu Hung

AU - Wang, Po Sheng

AU - Wang, Chao Gong

AU - Hsu, Shu Han

AU - Wu, Chih I.

N1 - Funding Information: This work is supported by National Science Councils (Grant No. NSC95-2112-M-002-043-MY3) and “Aim for Top University Project” from the Ministry of Education, Republic of China.

PY - 2010

Y1 - 2010

N2 - The correlation of energy alignment and turn-on voltage of organic light emitting diodes (OLEDs) was investigated. With identical hole transport layers (HTLs) and electron transport layers (ETLs), the turn-on voltages of OLEDs are always the same, regardless of the cathode structures, such as Ca, Al, LiF/Al, and Cs2 CO3 /Al. For devices with various combinations of HTLs and ETLs, the turn-on voltages are equal to the energy difference between the lowest unoccupied molecular orbital of ETLs and the highest occupied molecular orbital of HTLs, taking into consideration of vacuum level shift at organic interfaces measured from ultraviolet photoemission spectroscopy.

AB - The correlation of energy alignment and turn-on voltage of organic light emitting diodes (OLEDs) was investigated. With identical hole transport layers (HTLs) and electron transport layers (ETLs), the turn-on voltages of OLEDs are always the same, regardless of the cathode structures, such as Ca, Al, LiF/Al, and Cs2 CO3 /Al. For devices with various combinations of HTLs and ETLs, the turn-on voltages are equal to the energy difference between the lowest unoccupied molecular orbital of ETLs and the highest occupied molecular orbital of HTLs, taking into consideration of vacuum level shift at organic interfaces measured from ultraviolet photoemission spectroscopy.

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JO - Applied Physics Letters

JF - Applied Physics Letters

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Correlation of energy band alignment and turn-on voltage in organic light emitting diodes

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