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Effects of Organic Lithium Salt Ultrathin Films on the Electron Injection Efficiency in OLED SCIE SCOPUS

Title
Effects of Organic Lithium Salt Ultrathin Films on the Electron Injection Efficiency in OLED
Authors
Kim, YMYu, GCLee, TWKim, YC
Date Issued
2008-10
Publisher
TAYLOR & FRANCIS LTD
Abstract
We investigated the effects of the ultrathin film of a new cathode underlayer material, lithium tert-butyl cyclopentadienide (Li-TBCPD), on the electron injection efficiency and performance of the Alq3-based OLED. The current density-voltage-luminance (I-V-L) and the luminous efficiency characteristics of the [ITO/alpha-NPB (40 nm)/Alq3 (60 nm)/Li-TBCPD (1.0 nm)/Al] device were examined. The device with the Li-TBCPD/Al bilayer cathode demonstrated the current density of 360A/m(2) at 12V and the maximum luminance of 8,100 cd/m(2), while the device with the LiF/Al cathode showed 70A/m(2) and 5,800 cd/m(2), respectively. This improvement seems to originate from the relatively lower bond dissociation energy of Li-TBCPD and hence the easiness of lithium layer formation beneath the aluminum cathode.
Keywords
cathode modification; electron injection; lithium tert-butyl cyclopentadienide; OLEDs; LIGHT-EMITTING DEVICES; ELECTROLUMINESCENT DEVICES; ALUMINUM CATHODE; INTERFACE; LAYER; PERFORMANCE; DIODES
URI
https://oasis.postech.ac.kr/handle/2014.oak/28852
DOI
10.1080/154214008023
ISSN
1542-1406
Article Type
Article
Citation
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, vol. 491, page. 109 - 113, 2008-10
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이태우LEE, TAE WOO
Dept of Materials Science & Enginrg
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