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Confinement of Charge Carriers and Excitons in the Electrophosphorescent Devices: Mechanism of Light Emission and Degradation
Cited 48 time in
Web of Science
Cited 52 time in Scopus
- Authors
- Issue Date
- 2007
- Publisher
- Wiley-Blackwell
- Citation
- Adv. Mater. 2007, 19, 2061
- Keywords
- Blocking layers ; Charge transport ; Charge trapping ; Dyes ; Electrophosphorescence ; Exciton diffusi ; Light-emitting diodes, organic ; Triplet emitters
- Abstract
- Charge-carrier and exciton confinement is essential for efficiency and stability enhancment of electrophosphorescent devices. Emission-layer lifetimes of a 4,4-N,N-dicarbazole-biphenyl host doped with either a red- or green- emitting dye (upper and lower figures) show a strong dependence and near independence, respectively, on the type of exciton blocking layer used (four are shown). This is explained using energy- level differences and corresponding charge-trapping behavior.
- ISSN
- 0935-9648
- Language
- English
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