Multilayer cathode for organic light-emitting devices

Xiufang Li; Zhenbo Deng; Zheng Chen; Yumeng Shi; Denghui Xu

doi:10.1016/j.displa.2007.09.015

Multilayer cathode for organic light-emitting devices

Xiufang Li, Zhenbo Deng^*, Zheng Chen, Yumeng Shi, Denghui Xu

^*Corresponding author for this work

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

Abstract

A thin layer of samarium (Sm) was introduced in the cathode fabrication of the organic light-emitting devices (OLEDs). An efficient cathode Sm/LiF/Al used to improve the performance of OLEDs was reported. Standard N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl 4,4′-diamine (NPB)/tris-(8-hydroxyquinoline) aluminum (AlQ) devices with Sm/LiF/Al cathode showed dramatically enhanced electroluminescent (EL) brightness and efficiency. The optimized device with the 0.5 nm layer of Sm with the cathode structure of Sm/LiF/Al showed the improved power efficiency of 40% than the control device of the conventional LiF/Al cathode at 100 mA/cm². The drive voltage of the device with the Sm/LiF/Al cathode was decreased about 2 V at 500 mA/cm² compared with the conventional LiF/Al cathode device. The enhanced properties of the device with such a multilayer cathode are considered to the improved balance of electron/hole injection in the emitting layer.

Original language	English (US)
Pages (from-to)	323-326
Number of pages	4
Journal	Displays
Volume	29
Issue number	4
DOIs	https://doi.org/10.1016/j.displa.2007.09.015
State	Published - Oct 2008
Externally published	Yes

Keywords

Electroluminescence (EL)
Exciton
Organic light-emitting devices (OLEDs)

ASJC Scopus subject areas

Human-Computer Interaction
Hardware and Architecture
Electrical and Electronic Engineering

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10.1016/j.displa.2007.09.015

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@article{d4ecafade0f045708c1a56e73bf0541a,

title = "Multilayer cathode for organic light-emitting devices",

abstract = "A thin layer of samarium (Sm) was introduced in the cathode fabrication of the organic light-emitting devices (OLEDs). An efficient cathode Sm/LiF/Al used to improve the performance of OLEDs was reported. Standard N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl 4,4′-diamine (NPB)/tris-(8-hydroxyquinoline) aluminum (AlQ) devices with Sm/LiF/Al cathode showed dramatically enhanced electroluminescent (EL) brightness and efficiency. The optimized device with the 0.5 nm layer of Sm with the cathode structure of Sm/LiF/Al showed the improved power efficiency of 40% than the control device of the conventional LiF/Al cathode at 100 mA/cm2. The drive voltage of the device with the Sm/LiF/Al cathode was decreased about 2 V at 500 mA/cm2 compared with the conventional LiF/Al cathode device. The enhanced properties of the device with such a multilayer cathode are considered to the improved balance of electron/hole injection in the emitting layer.",

keywords = "Electroluminescence (EL), Exciton, Organic light-emitting devices (OLEDs)",

author = "Xiufang Li and Zhenbo Deng and Zheng Chen and Yumeng Shi and Denghui Xu",

year = "2008",

month = oct,

doi = "10.1016/j.displa.2007.09.015",

language = "English (US)",

volume = "29",

pages = "323--326",

journal = "Displays",

issn = "0141-9382",

publisher = "Elsevier B.V.",

number = "4",

}

TY - JOUR

T1 - Multilayer cathode for organic light-emitting devices

AU - Li, Xiufang

AU - Deng, Zhenbo

AU - Chen, Zheng

AU - Shi, Yumeng

AU - Xu, Denghui

PY - 2008/10

Y1 - 2008/10

N2 - A thin layer of samarium (Sm) was introduced in the cathode fabrication of the organic light-emitting devices (OLEDs). An efficient cathode Sm/LiF/Al used to improve the performance of OLEDs was reported. Standard N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl 4,4′-diamine (NPB)/tris-(8-hydroxyquinoline) aluminum (AlQ) devices with Sm/LiF/Al cathode showed dramatically enhanced electroluminescent (EL) brightness and efficiency. The optimized device with the 0.5 nm layer of Sm with the cathode structure of Sm/LiF/Al showed the improved power efficiency of 40% than the control device of the conventional LiF/Al cathode at 100 mA/cm2. The drive voltage of the device with the Sm/LiF/Al cathode was decreased about 2 V at 500 mA/cm2 compared with the conventional LiF/Al cathode device. The enhanced properties of the device with such a multilayer cathode are considered to the improved balance of electron/hole injection in the emitting layer.

AB - A thin layer of samarium (Sm) was introduced in the cathode fabrication of the organic light-emitting devices (OLEDs). An efficient cathode Sm/LiF/Al used to improve the performance of OLEDs was reported. Standard N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl 4,4′-diamine (NPB)/tris-(8-hydroxyquinoline) aluminum (AlQ) devices with Sm/LiF/Al cathode showed dramatically enhanced electroluminescent (EL) brightness and efficiency. The optimized device with the 0.5 nm layer of Sm with the cathode structure of Sm/LiF/Al showed the improved power efficiency of 40% than the control device of the conventional LiF/Al cathode at 100 mA/cm2. The drive voltage of the device with the Sm/LiF/Al cathode was decreased about 2 V at 500 mA/cm2 compared with the conventional LiF/Al cathode device. The enhanced properties of the device with such a multilayer cathode are considered to the improved balance of electron/hole injection in the emitting layer.

KW - Electroluminescence (EL)

KW - Exciton

KW - Organic light-emitting devices (OLEDs)

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U2 - 10.1016/j.displa.2007.09.015

DO - 10.1016/j.displa.2007.09.015

M3 - Article

AN - SCOPUS:50249123969

SN - 0141-9382

VL - 29

SP - 323

EP - 326

JO - Displays

JF - Displays

IS - 4

ER -

Multilayer cathode for organic light-emitting devices

Abstract

Keywords

ASJC Scopus subject areas

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