Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Properties of PCPP-Based Conjugated Polymers Containing Pendant Carbazole Units for LEDs

  • Jin, Young-Eup (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Kim, Sun-Hee (Department of Materials Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Lee, Hyo-Jin (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Song, Su-Hee (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Kim, Yun-Na (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Woo, Han-Young (Department of Nanomaterials Engineering, Pusan National University) ;
  • Lee, Kwang-Hee (Department of Materials Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Suh, Hong-Suk (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University)
  • Published : 2007.12.20
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Abstract

New poly(cyclopenta[def]phenanthrene) (PCPP)-based conjugated copolymers, containing carbazole units as pendants, were prepared as the electroluminescent (EL) layer in light-emitting diodes (LEDs) to show that most of them have higher maximum brightness and EL efficiency. The prepared polymers, Poly(2,6-(4-(6-(Ncarbazolyl)- hexyl)-4-octyl-4H-cyclopenta[def]phenanthrene)) (CzPCPP10) and Poly(2,6-(4-(6-(N-carbazolyl)- hexyl)-4-octyl-4H-cyclopenta[def]phenanthrene))-co-(2,6-(4,4-dioctyl-4H-cyclopenta[def]phenanthrene)) (CzPCPP7 and CzPCPP5), were soluble in common organic solvents and used as the EL layer in light-emitting diodes (LEDs) of configuration with ITO/PEDOT/polymer/Ca/Al device. The polymers are thermally stable with glass transition temperature (Tg) at 77-100 °C and decomposition temperature (Td) at 423-457 °C. The studies of cyclic voltammetry indicated same HOME levels in all polymers, although the ratios of carbazole units are different. In case of PLEDs with configuration of ITO/PEDOT/CzPCPPs/Ca/Al device, The EL maximum peaks were around 450 nm, which the turn-on voltages were about 6.0-6.5 V. The maximum luminescence of PLEDs using CzPCPP10 was over 4400 cd/m2 at 6.5 V, which all of the maximum EL efficiency were 0.12 cd/A. The CIE coordinates of the EL spectrum of PLEDs using CzPCPP10 was (0.18, 0.08), which are quite close to that of the standard blue (0.14, 0.08) of NTSC.

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References

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