Schematic illustration of the fabrication processes of type I and type II LEDs, respectively.
SEM images of (a) Ni nanodots on the LED surface after RTA, (b) the cross-section of nanorod LEDs array, (c) the top view, and (d) the tilted view of the nanorods interconnected by MLG films.
(a) I-V curves before and after a thermal annealing (200 °C, 15 min). (b) I-V curves of three different types of LEDs. (c) EL spectra at various injection current. The inset of (c) shows the EL intensity of type I and type II LEDs, respectively.
SEM images of MLG films around the metal pad after the devices fabrication of (a) type II and (b) type I LEDs, respectively. (c) Raman spectra of the two types of LEDs after fabrication processes.
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