Interface studies of Aluminum, 8-hydroxyquinolatolithium (Liq) and Alq3 for inverted OLED application

Youjong Lee; Joohyung Kim; Soonnam Kwon; Chang Ki Min; Y. Yi; J. W. Kim; Bonki Koo; Mun Pyo Hong

doi:10.1016/j.orgel.2008.01.001

Interface studies of Aluminum, 8-hydroxyquinolatolithium (Liq) and Alq₃ for inverted OLED application

Youjong Lee, Joohyung Kim, Soonnam Kwon, Chang Ki Min, Y. Yi, J. W. Kim, Bonki Koo, Mun Pyo Hong

Department of Physics

Research output: Contribution to journal › Article

49 Citations (Scopus)

Abstract

This study examined the interfaces of Alq₃ on a thin 8-hydroxyquinolatolithium (Liq) layer deposited on aluminum using X-ray and ultraviolet photoemission spectroscopy. A thin layer of Liq reacted with the underlying aluminum surface. As a result, the molecular orbital features of Alq₃ shifted to a higher binding energy and a new gap state was created. This effect is believed to lower the barrier height for electron injection. An organic light emitting device with a structure of ITO/Al/Liq/Alq₃/NPB/WO₃/Al was fabricated.The device performance showed characteristics that were consistent with the results of the photoemission studies. It is proposed that Al/Liq can be used as an efficient electron injection layer for inverted organic light emitting devices.

Original language	English
Pages (from-to)	407-412
Number of pages	6
Journal	Organic Electronics
Volume	9
Issue number	3
DOIs	https://doi.org/10.1016/j.orgel.2008.01.001
Publication status	Published - 2008 Jun

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All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Biomaterials
Chemistry(all)
Condensed Matter Physics
Materials Chemistry
Electrical and Electronic Engineering

Cite this

Lee, Y., Kim, J., Kwon, S., Min, C. K., Yi, Y., Kim, J. W., Koo, B., & Hong, M. P. (2008). Interface studies of Aluminum, 8-hydroxyquinolatolithium (Liq) and Alq₃ for inverted OLED application. Organic Electronics, 9(3), 407-412. https://doi.org/10.1016/j.orgel.2008.01.001

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title = "Interface studies of Aluminum, 8-hydroxyquinolatolithium (Liq) and Alq3 for inverted OLED application",

abstract = "This study examined the interfaces of Alq3 on a thin 8-hydroxyquinolatolithium (Liq) layer deposited on aluminum using X-ray and ultraviolet photoemission spectroscopy. A thin layer of Liq reacted with the underlying aluminum surface. As a result, the molecular orbital features of Alq3 shifted to a higher binding energy and a new gap state was created. This effect is believed to lower the barrier height for electron injection. An organic light emitting device with a structure of ITO/Al/Liq/Alq3/NPB/WO3/Al was fabricated.The device performance showed characteristics that were consistent with the results of the photoemission studies. It is proposed that Al/Liq can be used as an efficient electron injection layer for inverted organic light emitting devices.",

author = "Youjong Lee and Joohyung Kim and Soonnam Kwon and Min, {Chang Ki} and Y. Yi and Kim, {J. W.} and Bonki Koo and Hong, {Mun Pyo}",

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AU - Lee, Youjong

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AU - Kwon, Soonnam

AU - Min, Chang Ki

AU - Yi, Y.

AU - Kim, J. W.

AU - Koo, Bonki

AU - Hong, Mun Pyo

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AB - This study examined the interfaces of Alq3 on a thin 8-hydroxyquinolatolithium (Liq) layer deposited on aluminum using X-ray and ultraviolet photoemission spectroscopy. A thin layer of Liq reacted with the underlying aluminum surface. As a result, the molecular orbital features of Alq3 shifted to a higher binding energy and a new gap state was created. This effect is believed to lower the barrier height for electron injection. An organic light emitting device with a structure of ITO/Al/Liq/Alq3/NPB/WO3/Al was fabricated.The device performance showed characteristics that were consistent with the results of the photoemission studies. It is proposed that Al/Liq can be used as an efficient electron injection layer for inverted organic light emitting devices.

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Access to Document

10.1016/j.orgel.2008.01.001