Figure 7: Comparison of optical and electrical characteristics of UV LEDs grown on PSS with different NLs.

(a) L-I curves of UV LEDs with 25-nm-thick GaN/AlGaN/sputtered AlN NLs. (b) I-V curves of UV LEDs with 25-nm-thick GaN/AlGaN/sputtered AlN NLs. (c) L-I curves of UV LEDs with various thicknesses of sputtered AlN NL. (d) I-V curves of UV LEDs with various thicknesses of sputtered AlN NL.