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, YM; Yu, GC; Lee, TW; Kim, 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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