Share Email Print
cover

Proceedings Paper

Tandem white organic light emitting diodes consisting of blue and red phosphorescent unit devices connected with a transparent Al:LiF/MoO3 connecting layer
Author(s): Jungjin Yang; Chandra Kant Suman; Changhee Lee
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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.

Paper Details

Date Published: 2 September 2009
PDF: 7 pages
Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151X (2 September 2009); doi: 10.1117/12.826791
Show Author Affiliations
Jungjin Yang, Seoul National Univ. (Korea, Republic of)
Chandra Kant Suman, Seoul National Univ. (Korea, Republic of)
Changhee Lee, Seoul National Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7415:
Organic Light Emitting Materials and Devices XIII
Franky So; Chihaya Adachi, Editor(s)

© SPIE. Terms of Use
Back to Top