2 September 2009 Tandem white organic light emitting diodes consisting of blue and red phosphorescent unit devices connected with a transparent Al:LiF/MoO3 connecting layer
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Abstract
Tandem white organic light emitting diodes (WOLEDs) are fabricated with blue and red unit devices connected by a transparent Al:LiF/molybdenum oxides (MoO3) connecting layer. The blue and red unit devices have been fabricated with standard structure based on 8 % iridium (III)bis(4,6-(di-fluorophenyl)-pyridinato-N,C2') picolinate (FIrpic) doped in N,N'-dicarbazolyl-3,5-benzene (mCP) and 8 % bis (1-phenylisoquinolinato-N,C2 )iridium(acetylacetonate) ((piq)2Ir(acac)) doped in 4,4'-N,N'-dicarbazolebiphenyl (CBP), respectively. The doping concentration of LiF in the Al:LiF composite layer is 10 % and the Al:LiF layer thickness is varied from 3 nm up to 10 nm to optimize the performance of tandem WOLEDs while the MoO3 thickness is fixed at 10 nm. We found that electron injection efficiency decreases for thicker Al:LiF layer, resulting lower electroluminescence (EL) efficiency. The maximum brightness and current luminous efficiency for the tandem WOLEDs are about 32,230 cd/m2 and 18.5 cd/A, respectively, for the Al:LiF (10 %) thickness of 3 nm.
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Jungjin Yang, Jungjin Yang, Chandra Kant Suman, Chandra Kant Suman, Changhee Lee, Changhee Lee, } "Tandem white organic light emitting diodes consisting of blue and red phosphorescent unit devices connected with a transparent Al:LiF/MoO3 connecting layer", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151X (2 September 2009); doi: 10.1117/12.826791; https://doi.org/10.1117/12.826791
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