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Diimide nanoclusters play hole trapping and electron injection roles in organic light-emitting devices
- Diimide nanoclusters play hole trapping and electron injection roles in organic light-emitting devices
- Cho, Gwijeong; Lee, Hyena; Woo, Sungho; Nam, Sungho; Kim, Hwajeong; Kim, Youngkyoo
- DGIST Authors
- Woo, Sungho
- Issue Date
- Nanoscale, 3(3), 1073-1077
- Article Type
- Amine Moieties; Chemistry; Current Density; Diimide; Electron Injection; Electron Transport; Electron Transport Layers; Equipment; Equipment Design; Equipment Failure Analysis; Glass Transition; Glass Transition Temperature; Hole Trapping; Hole Traps; Illumination; Imide; Imides; Instrumentation; Light Emission; Lighting; Materials Testing; Nano-Structures; Nanoclusters; Nanomaterial; Organic Chemicals; Organic Compound; Organic Light-Emitting Devices; Particle Size; Semiconductor; Semiconductors; Thermally Stable; Ultrastructure; Wide Band Gap
- We report thermally stable diimide nanoclusters that could potentially replace the conventional thick electron transport layer (ETL) in organic light-emitting devices (OLEDs). Bis-[1,10]phenanthrolin-5-yl-bicyclo[2.2.2]oct- 7-ene-2,3,5,6-tetracarboxylic diimide (Bphen-BCDI) was synthesized from the corresponding dianhydride and amine moieties, and its purified product exhibited a high glass transition temperature (232 °C) and a wide band gap (3.8 eV). The Bphen-BCDI subnanolayers deposited on substrates were found to form organic nanoclusters, not a conventional layer. The OLED made with a subnanolayer of Bphen-BCDI nanoclusters, instead of a conventional ETL, showed greatly improved efficiency (about 2-fold) compared with an OLED without the diimide nanoclusters. The role of the BPhen-BCDI nanoclusters was assigned to hole trapping and electron injection in the present OLED structure. © 2011 The Royal Society of Chemistry.
- Royal Society of Chemistry
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