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http://dx.doi.org/10.5012/bkcs.2007.28.12.2419

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)
Publication Information
Bulletin of the Korean Chemical Society / v.28, no.12, 2007 , pp. 2419-2425 More about this Journal
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.
Keywords
Light emitting diode; PCPP; Carbazole;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
Times Cited By Web Of Science : 1  (Related Records In Web of Science)
Times Cited By SCOPUS : 1
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