InGaN blue light-emitting diodes (LEDs) were fabricated on a sapphire substrate with a ZnO nucleation layer that was deposited by the sol-gel method. Typical current-voltage (I-V) characteristics of the InGaN blue LEDs with a ZnO nucleation layer have a forward-bias voltage of 3.25 V at an injection current of 20 mA, and reverse currents of 2.33 × 10 −8 and 5.91 × 10 −7 A at reverse biases of 10 and 20 V, respectively. The InGaN blue LEDs have an ideality factor n of 1.27 at a forward bias of 1.8 V. The external quantum efficiency at an injection current of 20 mA was measured to be 12.82%. The light output power reached as high as 23.2 mW at a forward current of 100 mA.
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