Synthesis and Characterization of Oxadiazole-Containing Silane with High Triplet Energy, and Application in Blue Phosphorescent Organic Light Emitting Diodes
Date Issued
2012
Date
2012
Author(s)
Yang, Wan-Hsi
Abstract
We synthesized a series of oxadiazole derivatives as the host materials for blue phosphorescent organic light
emitting diodes. We introduced the arylsilane which has more rigid characteristic to increase the molecular weight and steric effect improving the thermal stability of oxadiazole derivatives. Additionally, the silicon atom would disrupt the conjugation length which made the oxadiazole derivatives get large band gap and high triplet energy. We also investigated the thermal, photophysical and electrochemical properties to realize the characteristic of these compounds. In the end, we fabricated the phosphorescent organic light emitting diode using the compound 4, 7, 10, 15 as the host materials doped with the blue-light triplet guest emitter bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium (FIrpic). The compound 15 showed the best performance in device exhibiting the turn on voltage at 10 mA/cm2 was 6.9 V, max. luminance of 5124 cd/m2, current efficiency of 39.9 cd/A, power efficiency of 31.4 lm/W and the external quantum efficiency of 13.08 %.
emitting diodes. We introduced the arylsilane which has more rigid characteristic to increase the molecular weight and steric effect improving the thermal stability of oxadiazole derivatives. Additionally, the silicon atom would disrupt the conjugation length which made the oxadiazole derivatives get large band gap and high triplet energy. We also investigated the thermal, photophysical and electrochemical properties to realize the characteristic of these compounds. In the end, we fabricated the phosphorescent organic light emitting diode using the compound 4, 7, 10, 15 as the host materials doped with the blue-light triplet guest emitter bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium (FIrpic). The compound 15 showed the best performance in device exhibiting the turn on voltage at 10 mA/cm2 was 6.9 V, max. luminance of 5124 cd/m2, current efficiency of 39.9 cd/A, power efficiency of 31.4 lm/W and the external quantum efficiency of 13.08 %.
Subjects
host
oxadiazole
silane
emitting diodes
Type
thesis
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