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Figure 4 | Nanoscale Research Letters

Figure 4

From: Enhancement of light output power of GaN-based light-emitting diodes with photonic quasi-crystal patterned on p-GaN surface and n-side sidewall roughing

Figure 4

Typical current–voltage ( I - V ) and light output power-current ( L - I ) characteristics. (a) Current–voltage (I-V) characteristics of conventional LED, LED with PQC on p-GaN surface, LED with PQC on n-side roughing, and LED with PQC structure on p-GaN surface and n-side roughing, respectively. (b) Light output power-current (L-I) and wall-plug efficiency (WPE) characteristics of LED with/without PQC structure, respectively.

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