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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