Study of lithium fluoride/tris(8-hydroxyquinolino)-aluminum interfacial chemistry using XPS and ToF-SIMS

Weijie Song; Shu Kong SO; K. W. Wong; W. K. Choi; Lili Cao

doi:10.1016/j.apsusc.2004.01.036

Study of lithium fluoride/tris(8-hydroxyquinolino)-aluminum interfacial chemistry using XPS and ToF-SIMS

Weijie Song^*, Shu Kong SO, K. W. Wong, W. K. Choi, Lili Cao

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Journal article › peer-review

18 Citations (Scopus)

Abstract

The insertion of a thin LiF layer between Al and tris(8-hydroxyquinolino)- aluminum (Alq ₃ ) is a significant advance in the practical development of organic light-emitting devices (OLEDs). We studied the chemistry at the buried interface of LiF/Alq ₃ using X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF-SIMS). Dramatic changes in Al 2p, N 1s, and O 1s line shapes were observed after LiF deposition. These changes were attributed to the partial substitution of hydroxyquinoline ligands of Alq ₃ by F ^- , and the formation of hydroxyquinoline anions at the LiF/Alq ₃ interface. The AlqF ⁺ structure of products was confirmed by ToF-SIMS.

Original language	English
Pages (from-to)	373-377
Number of pages	5
Journal	Applied Surface Science
Volume	228
Issue number	1-4
DOIs	https://doi.org/10.1016/j.apsusc.2004.01.036
Publication status	Published - 30 Apr 2004

Scopus Subject Areas

Chemistry(all)
Condensed Matter Physics
Physics and Astronomy(all)
Surfaces and Interfaces
Surfaces, Coatings and Films

User-Defined Keywords

Alq
Interfacial reaction
Organic light-emittng devices

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10.1016/j.apsusc.2004.01.036

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title = "Study of lithium fluoride/tris(8-hydroxyquinolino)-aluminum interfacial chemistry using XPS and ToF-SIMS",

abstract = " The insertion of a thin LiF layer between Al and tris(8-hydroxyquinolino)- aluminum (Alq 3 ) is a significant advance in the practical development of organic light-emitting devices (OLEDs). We studied the chemistry at the buried interface of LiF/Alq 3 using X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF-SIMS). Dramatic changes in Al 2p, N 1s, and O 1s line shapes were observed after LiF deposition. These changes were attributed to the partial substitution of hydroxyquinoline ligands of Alq 3 by F - , and the formation of hydroxyquinoline anions at the LiF/Alq 3 interface. The AlqF + structure of products was confirmed by ToF-SIMS.",

keywords = "Alq, Interfacial reaction, Organic light-emittng devices",

author = "Weijie Song and SO, {Shu Kong} and Wong, {K. W.} and Choi, {W. K.} and Lili Cao",

year = "2004",

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doi = "10.1016/j.apsusc.2004.01.036",

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journal = "Applied Surface Science",

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T1 - Study of lithium fluoride/tris(8-hydroxyquinolino)-aluminum interfacial chemistry using XPS and ToF-SIMS

AU - Song, Weijie

AU - SO, Shu Kong

AU - Wong, K. W.

AU - Choi, W. K.

AU - Cao, Lili

PY - 2004/4/30

Y1 - 2004/4/30

N2 - The insertion of a thin LiF layer between Al and tris(8-hydroxyquinolino)- aluminum (Alq 3 ) is a significant advance in the practical development of organic light-emitting devices (OLEDs). We studied the chemistry at the buried interface of LiF/Alq 3 using X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF-SIMS). Dramatic changes in Al 2p, N 1s, and O 1s line shapes were observed after LiF deposition. These changes were attributed to the partial substitution of hydroxyquinoline ligands of Alq 3 by F - , and the formation of hydroxyquinoline anions at the LiF/Alq 3 interface. The AlqF + structure of products was confirmed by ToF-SIMS.

AB - The insertion of a thin LiF layer between Al and tris(8-hydroxyquinolino)- aluminum (Alq 3 ) is a significant advance in the practical development of organic light-emitting devices (OLEDs). We studied the chemistry at the buried interface of LiF/Alq 3 using X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF-SIMS). Dramatic changes in Al 2p, N 1s, and O 1s line shapes were observed after LiF deposition. These changes were attributed to the partial substitution of hydroxyquinoline ligands of Alq 3 by F - , and the formation of hydroxyquinoline anions at the LiF/Alq 3 interface. The AlqF + structure of products was confirmed by ToF-SIMS.

KW - Alq

KW - Interfacial reaction

KW - Organic light-emittng devices

UR - http://www.scopus.com/inward/record.url?scp=1942452955&partnerID=8YFLogxK

U2 - 10.1016/j.apsusc.2004.01.036

DO - 10.1016/j.apsusc.2004.01.036

M3 - Journal article

AN - SCOPUS:1942452955

SN - 0169-4332

VL - 228

SP - 373

EP - 377

JO - Applied Surface Science

JF - Applied Surface Science

IS - 1-4

ER -

Study of lithium fluoride/tris(8-hydroxyquinolino)-aluminum interfacial chemistry using XPS and ToF-SIMS

Abstract

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