DGIST Scholar: Synthesis and electro-optical properties of carbazole derivatives for organic device applications

Title: Synthesis and electro-optical properties of carbazole derivatives for organic device applications

Citation: Kim, Ki-Soo. (2009-09). Synthesis and electro-optical properties of carbazole derivatives for organic device applications. Synthetic Metals, 159(17–18), 1870–1875. doi: 10.1016/j.synthmet.2009.06.009

Author Keywords: Carbazole ; Electroluminescence ; Host material ; Hole-transporting material

Keywords: Band Gap Energy ; Carbazole ; Carbazole Derivatives ; Diodes ; Doping (Additives) ; Double Layers ; Electroluminescence ; ELECTROLUMINESCENT DEVICES ; Electron Affinity ; Electronic Energy Levels ; Electrooptical Properties ; ELECTROPHOSPHORESCENCE ; Green emissions ; Green Light ; HIGH-EFFICIENCY ; Hole-Transporting Material ; Hole-Transporting Materials ; Hole-Transporting Property ; HOST ; Host Material ; Host Materials ; Ionization Potential ; IR(ppy)3 ; Iridium ; Light ; LIGHT-emITTING DEVICES ; Light emission ; Light Transmission ; Materials ; Maximum Luminance ; MECHANISMS ; Multi-Layer Devices ; OLEDS ; Optical Properties ; Organic Devices ; Polymer ; Single Bond ; Sound Insulating Materials ; Suzuki-Coupling Reaction ; Synthesis (Chemical) ; Two-Materials

Abstract: Two materials, DNCz and TCzPB, which contain carbazole moieties and exhibit high band gap energies, were synthesized via C{single bond}N coupling and Suzuki coupling reactions, respectively. The ionization potential and electron affinity of the synthesized TCzPB were measured at 5.89 and 2.39 eV, respectively, implying that it is suitable for a host material. A doped multilayer device, ITO/DNTPD/NPD/TCzPB + Ir(ppy)3/BCP/Alq3/LiF/Al, exhibited a bright green emission with a maximum luminance of 27,200 cd/m2 (17.6 cd/A at 18.0 V) when the synthesized TCzPB was used as the host material for a phosphorescent green dopant. The compound DNCz exhibited similar electronic energy levels to those of NPD, and was applied as a hole-transporting material. Bright green light originated from the Alq3 layer was observed in the double layer device, ITO/DNCz/Alq3/LiF/Al. The high hole-transporting property of DNCz was also demonstrated. © 2009 Elsevier B.V. All rights reserved.
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