Figure 3

EL spectra of LEDs. The LEDs are with Au nanoparticles from the 2- and 5-nm Au-CNT systems with an injection current of 100 mA measured at room temperature, using a planar LED as a reference. The inset shows optical microscope images of the LEDs (a) without any Au nanoparticles, (b) with Au nanoparticles from the 5-nm Au-CNT system, and (c) with Au nanoparticles from the 2-nm Au-CNT system. All of the devices were operated with an injection current of 100 mA.