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Confinement of Charge Carriers and Excitons in the Electrophosphorescent Devices: Mechanism of Light Emission and Degradation

Cited 46 time in Web of Science Cited 50 time in Scopus
Authors
Chin, Byung Doo; Lee, Changhee
Issue Date
2007
Publisher
Wiley-Blackwell
Citation
Adv. Mater. 2007, 19, 2061
Keywords
Blocking layersCharge transportCharge trappingDyesElectrophosphorescenceExciton diffusiLight-emitting diodes, organicTriplet 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
URI
https://hdl.handle.net/10371/13667
DOI
https://doi.org/10.1002/adma.200602509
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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