Abstract
The utilization of a photoreactive hole injection/transport layer in multilayer electrophosphorescence polymer light-emitting diodes (PLEDs) is demonstrated in this study. A new photoreactive polymer was synthesized using 3,6-dibromo-9-(6-((3-methyloxetan-3-yl)methoxy)hexyl)-9H-carbazole and 2,4-dimethyl-N,N-bis(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)aniline via the Suzuki coupling reaction. When oxetane groups were photopolymerized in the presence of a cationic photoinitiator, the cured film showed good compatibility with PEDOT:PSS and the indium tin oxide (ITO) layer due to the hydrophilic nature of the cross-linked section. The resulting green light-emitting device bearing PVK:PBD:Ir(Cz-ppy)3 exhibits a maximum external quantum efficiency of 8.73%, corresponding to a luminous efficiency of 28.2 cd/A when using the device configuration of ITO/POx-TPACz/PEDOT:PSS/PVK:PBD:Ir(Cz-ppy)3/TAZ/Alq3/LiF/Al. These values are higher than those of PLEDs using conventional PEDOT:PSS as a single hole injection layer (HIL). The slight degree of improvement in device efficiency is due to the reduced hole injection barrier.
Original language | English |
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Pages (from-to) | 2147-2152 |
Number of pages | 6 |
Journal | Synthetic Metals |
Volume | 159 |
Issue number | 19-20 |
DOIs | |
Publication status | Published - 2009 Oct |
Keywords
- Electrophosphorescence
- Energy transfer
- Iridium(III) complex
- Oxetane
- Photocross-link
- Photoluminescence
- Solubility
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry