Abstract
The electroluminescent characteristics of the host MEH–PPV and PVK polymeric light-emitting diodes with and without doping carbon nanotubes (CNTs) have been demonstrated. For MEH–PPV-based devices, maximum luminance of the pristine and CNTs-doped polymeric light-emitting diodes exhibit 3900 cd/m 2 at 5.0 V and 3600 cd/m 2 at 5.4 V. For PVK-based devices, maximum luminance of the pristine, 0.05% and 0.1% CNTs-doped polymeric light-emitting diodes exhibit 3600 cd/m 2 at 6.2 V, 7600 cd/m 2 at 8.2 V and 6800 cd/m 2 at 9.1 V. The performance of polymeric light-emitting diodes in electroluminescence has been demonstrated by the improvement of doping carbon nanotubes in polymer matrix. This may be due to the chemical interaction bonding between carbon nanotubes and organic molecules in the polymer matrix and the variation of energy level in electronic structure.
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