Synthesis of Polymers Containing Pendent Arylsilane-Modified Carbazole and the Application on Blue Phosphorescent Polymer Light Emitting Diodes
Date Issued
2012
Date
2012
Author(s)
Chang, Yung-Shen
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, we synthesize a series of polymers containing pendant arylsilane-modified carbazole. Carbazole has good hole-transporting characteristic and high triplet energy gap. Arylsilane group could interrupt conjugation length and raise triplet energy level. The bulky arylsilane group could restrain polymer aggregation preventing guest self-quenching. 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 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 blue electroluminescent device is ITO/PEDOT/P1:FIrpic 20 %:TRZ 40 %/Mg/Ag which has maximum luminance 2460 cd/m2 and maximum current efficiency 4.93 cd/A. The best white electroluminescent device is ITO/PEDOT/P1:FIrpic 20 %:Ir(2-phq)2acac 0.4 %:TRZ 40 %/Mg/Ag which has maximum luminance 4000 cd/m2 and maximum current efficiency 5.13 cd/A .
Subjects
PLED
free radical polymerization
carbazole
arylsilane
Type
thesis
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