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 › peer-review

50 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

All Science Journal Classification (ASJC) codes

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

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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}",

year = "2008",

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doi = "10.1016/j.orgel.2008.01.001",

language = "English",

volume = "9",

pages = "407--412",

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T1 - Interface studies of Aluminum, 8-hydroxyquinolatolithium (Liq) and Alq3 for inverted OLED application

AU - Lee, Youjong

AU - Kim, Joohyung

AU - Kwon, Soonnam

AU - Min, Chang Ki

AU - Yi, Y.

AU - Kim, J. W.

AU - Koo, Bonki

AU - Hong, Mun Pyo

PY - 2008/6

Y1 - 2008/6

N2 - 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.

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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