Preparation and characterization of phosphorescence organic light-emitting diodes using poly-vinylcarbazole: Tris(2-phenylpyridine) iridium(III) emission layer

Hak Min Lee, Seung Jun Baek, Su Cheol Gong, Chang Duk Jeon, Jin Eun Choi, Hyung-Ho Park, Hyeongtag Jeon, Young Chul Chang, Ho Jung Chang

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An emission layer with the poly-vinylcarbazole (PVK) and Ir(ppy) 3[tris(2-phenylpyridine)iridium(III)] as the host and guest materials, respectively, was prepared on a PEDOT:PSS/ITO substrate. TPBI [2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole)] was introduced to improve the light efficiency of the devices. Green phosphorescence polymer LEDs with the structure ITO/PEDOT:PSS/PVK:Ir(ppy)3/TPBI/LiF/ Al were fabricated and their electrical and optical properties investigated at various doping concentrations (0.5wt%to2.5wt%) of Ir(ppy)3. The maximum luminance and current density were about 8600cd/m2 and 155mA/cm2 at 7V, respectively, when the TPBI layer was introduced between the emission layer and cathode electrode film. The emission spectrum and Commission International d'Eclairage (CIE) color coordinates were about 512nm and (x,y=0.27 to 0.28, 0.61 to 0.63), respectively, showing a green color.

Original languageEnglish
Article number104001
JournalOptical Engineering
Issue number10
Publication statusPublished - 2009 Dec 1


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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