Fabrication and Effects of Ag Nanoparticles Hexagonal Arrays in Green LEDs by Nanoimprint

In this letter, the Ag nanoparticles (NPs), which are located inside the hexagonal photonic crystals (PhCs) array holes, are successfully fabricated in green light-emitting diode (LED) by nanoimprint and lift-off techniques. The photoluminescence intensity of the green LED is increased by 4.5 folds compared with that of the bare LED due to the PhCs effect and the localized surface plasmon (LSP) multiple quantum wells coupling effect, which is further confirmed by the enhanced decay rate of LSP-functioned LED. In the simulation of 3-D finite difference time domain, it reveals that the morphology of Ag NP will affect the LSP resonant strength and the light scattering efficiency besides the periodic structure.