Abstract

We report a two-layer, blue organic light-emitting diode with a 4,4′-bis(2,2-diphenylvinyl)-1,1′-biphenyl emission layer and a LiF/Al cathode which has an external quantum efficiency of 1.4% and a maximum luminance of 3000 cd/m2. Insertion of the thin LiF layer results in a 50-fold increase in the device efficiency compared to a device with an aluminum only cathode, and eliminates the need for an electron-transporting layer, such as tris(8-hydroxyquinoline)aluminum. This results in a device with excellent color purity with an emission peak at 476 nm and a full width at half maximum of 78 nm. Using ultraviolet photoelectron spectroscopy, we find that the effective work-function of aluminum decreases dramatically with sub-monolayer amounts of LiF deposited on the surface.

Keywords

CathodeOLEDMaterials scienceAluminiumWork functionOptoelectronicsLayer (electronics)X-ray photoelectron spectroscopyDiodeLight-emitting diodeQuantum efficiencyFull width at half maximumLithium fluorideAnalytical Chemistry (journal)OpticsChemistryInorganic chemistryNanotechnology

Affiliated Institutions

Related Publications

Publication Info

Year
1998
Type
article
Volume
84
Issue
4
Pages
2324-2327
Citations
284
Access
Closed

External Links

View on DOI.org

Social Impact

Altmetric
PlumX Metrics

Social media, news, blog, policy document mentions

Citation Metrics

284
OpenAlex

Cite This

Sean E. Shaheen, Ghassan E. Jabbour, M. M. Morrell et al. (1998). Bright blue organic light-emitting diode with improved color purity using a LiF/Al cathode. Journal of Applied Physics , 84 (4) , 2324-2327. https://doi.org/10.1063/1.368299

Identifiers

DOI
10.1063/1.368299