Date
Place
- Room H (Room Hall 1, 1F)
- P2. Poster Session II
- August 21, 2015 (Friday)
- 14:00 ~ 15:30
- [P2-129]
- 14:00 ~ 15:30
- Title:White Organic Light-Emitting Diodes with Soluble-Processed Single EML Layer Consisted of Blue and Orange Iridium dopants
- O Jun Kwon, Suhwan Lee (Univ. of Seoul, Korea), Jung Woon Kim (Kyonggi Univ., Korea), Seonghwa Choi (Dong-A Univ., Korea), Dong Jun Lee (Univ. of Seoul, Korea), Jaemin Lee (KRICT, Korea), Jeonghun Kwak (Dong-A Univ., Korea), Eunhee Lim (Kyonggi Univ., Korea), and Byung Jun Jung (Univ. of Seoul, Korea)
Abstract: ?White Organic Light-emitting diodes (OLEDs) have been spotlighted as a next generation lighting. In this study, we fabricated white organic light-emitting diodes (OLEDs) with different ratio of the blue and orange dopants. The emitting layer (EML) is composed of a polymeric material, poly(9-vinylcarbazole) (PVK), and a carbazole-based small molecule. The blue dopant is bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III) (FIrpic) and the orange dopant is bis(2-phenylbenzothiazolato)(acetylacetonate)iridium(III) (Ir(BT)2acac). The device structure is ITO/poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS)/soluble processed EML/1,3-bis(3,5-dipyrid-3-yl-phenyl)benzene (BmPyPB)/LiF/Al. The electroluminescent spectra are shown in Figure 1(a) as the dopant ratios of blue and orange from 85:15 to 95:5. The Commision Internationale de L¡¯Eclairage (CIE) coordinates of each spectrum are (0.46, 0.48), (0.44, 0.47), (0.41, 0.46) and (0.37, 0.45). The device of 95:5 as blue: orange dopant ratio shows the emission close to white with around 10 % of maximum external quantum efficiency (EQE). As the ratio of blue dopants increased, EQE of devices are reduced. The device of 90:10 emits warm white emission of (0.44, 0.47) with 12% of maximum EQE.
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