Figure 3.

Photos of LED surface. (a) An optical micrograph of an LED die with PQC structure on p-GaN surface and n-side roughing, (b) the tilted plane view SEM image between TCL and n-side roughing region (left-side inset 12-fold photonic quasi-crystal model), (c) p-GaN surface, and (d) n-side roughing of cross section SEM images with photonic quasi-crystal structure.

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