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Carrier Transport Mechanisms of Phosphorescent Organic Light-Emitting Devices Fabricated Utilizing a N,N '-Dicarbazolyl-3,5-Benzene: 1,3,5-Tri#Phenyl-2-Benzimidazole#-Benzene Mixed Host Emitting Layer

Title
Carrier Transport Mechanisms of Phosphorescent Organic Light-Emitting Devices Fabricated Utilizing a N,N '-Dicarbazolyl-3,5-Benzene: 1,3,5-Tri#Phenyl-2-Benzimidazole#-Benzene Mixed Host Emitting Layer
Author
김태환
Keywords
LUMINANCE EFFICIENCY ENHANCEMENT; PHOSPHORESCENT ORGANIC LIGHT-EMITTING DIODE; TRIPLET EXCITON
Issue Date
2012-02
Publisher
American Scientific Publishers
Citation
Journal of Nanoscience and Nanotechnology, 2012, 12(2), P.1649~1702
Abstract
The electrical and the optical properties of phosphorescent organic light-emitting devices (PHOLEDs) fabricated utilizing a mixed host emitting layer (EML) consisting of N,N′-dicarbazolyl-3,5-benzene (mCP) and 1,3,5-tri(phenyl-2-benzimidazole)-benzene (TPBi) were investigated to clarify the carrier transport mechanisms of PHOLEDs. While the operating voltage of the PHOLEDs with a mixed host EML significantly decreased due to the insertion of TPBi with a high electron mobility, the quantum efficiency of the PHOLEDs decreased due to the hindrance of the exciton energy transfer by TPBi molecules. The electroluminescence spectra for the PHOLEDs with an tris(2-phenylpyridine)iridium-doped mixed host EML showed that the TPBi molecules in the mixed host EML increased the electron injection into the mixed host EML, resulting in a decrease of the shift length of the recombination zone in comparison with a single host EML.
URI
http://www.ingentaconnect.com/content/asp/jnn/2012/00000012/00000002/art00158http://hdl.handle.net/20.500.11754/67440
ISSN
1533-4880
DOI
10.1166/jnn.2012.4587
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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