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.

Lai and Yang Nanoscale Research Letters 2013 8:244   doi:10.1186/1556-276X-8-244
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