Synthesis and Application on Polymer Light Emitting Diode of Polymers Containing Pendant Carbazole and Oxadiazole
Date Issued
2011
Date
2011
Author(s)
Lee, Jong-Yih
Abstract
In this study, polymers containing pendant emitting groups are synthesized and used as host materials for polymer light emitting diodes. By free radical polymerization and controlling the feed ratio of monomers, we synthesize a series of homopolymers and copolymers containing pendant carbazole and oxadiazole groups. Carbazole has good hole-transporting characteristic and high triplet energy gap, and oxadiazole has good electron-transporting characteristic. The thermal stability, optical properties, electrochemical properties, and the electroluminescent performance are discussed. All the polymers show good thermal stability with high glass transition temperature and decomposition temperature due to their rigid structure. The UV-Vis absorption and photoluminescence spectra show that the peaks are at ultraviolet region or near blue light region. The high triplet energy gap of polymers can efficiently assist energy transfer to the guest. The electrochemical behaviors reveal that the energy levels of polymers match the material used in devices. The best electroluminescent performance is 9000 cd/m2 and 13 cd/A with doped 4wt% Ir(ppy)3.
Subjects
PLED
free radical polymerization
carbazole
oxadiazole
copolymer.
Type
thesis
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