Efficiency stabilization in deep-blue organic light-emitting devices with a double emitting layer acting as electron and hole trapping layers
- Authors
- Bang, H. S.; Lee, D. U.; Kim, T. W.; Han, S. M.; Seo, J. H.; Kim, Y. K.
- Issue Date
- 30-Jun-2008
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- organic light-emitting device; luminescence mechanism; stepwise doped hole transport layer
- Citation
- THIN SOLID FILMS, v.516, no.16, pp.5649 - 5653
- Journal Title
- THIN SOLID FILMS
- Volume
- 516
- Number
- 16
- Start Page
- 5649
- End Page
- 5653
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/22723
- DOI
- 10.1016/j.tsf.2007.07.034
- ISSN
- 0040-6090
- Abstract
- The influence of the presence of a double emitting layer (DEL) consisting of 4,4'-Bis(carbazol-9-yl)bipheny1 (CBP) and 4,4'-Bis(2,2-diphenyl-ethen-1-yl)diphenyl (DPVBi) acting as electron and hole trapping layers in the organic light-emitting devices (OLEDs) was studied. While the luminance efficiency of the OLEDs with a DEL was very stable, regardless of variations in the applied voltage, that of the OLEDs with a CBP or a DPVBi emitting layer varied with the applied voltage. The rate of decrease is smaller than the single emitting layer, about 30%. The dominant peak corresponding to the CBP layer, in the electroluminescence spectrum for the OLEDs with a DEL appeared at 451 nm, which is in the deep-blue region. The Commission Internationale de l'Eclairage chromaticity coordinates of the OLEDs with a DEL at 11 V were (0.150, 0.137), indicative of a deep, stabilized blue color. These results indicate that luminance efficiency-stabilized blue OLEDs can be fabricated using a CBP/DPVBi DEL acting as electron and hole trapping layers. (C) 2007 Elsevier B.V. All rights reserved.
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