Synthesis and electro-optical properties of light-emitting polymers containing oxadiazole derivatives for light-emitting diodes applications
2008
Kim, Sung Chul | Park, Seung-Min | Park, Jin Soo | Lee, Seung-Joon | Jin, Sung-Ho | Gal, Yeong-Soon | Yi, Chae-uk
Two PPV-based bipolar polymers containing 1,3,4-oxadiazole pendant groups were synthesized via the Gilch polymerization reaction for use in light-emitting diodes (LEDs). The resulting polymers were characterized using ¹H and ¹³C NMR, elemental analysis, DSC, and TGA. These polymers were found to be soluble in common organic solvents and are easily spin-coated onto glass substrates, producing high optical quality thin films without defects. The electro-optical properties of ITO/PEDOT/polymer/Al devices based on these polymers were investigated using UV-visible, PL, and EL spectroscopy. The turn-on voltages of the OC₁Oxa-PPV and OC₁₀Oxa-PPV devices were found to be 8.0 V. The maximum brightness and luminescence efficiency of the OC₁Oxa-PPV device were found to be 544 cd/m² at 19 V and 0.15 cd/A, respectively. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 1098-1110, 2008
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