@article{ refId, author = {{David, A.}}, encoding = {tex}, title = {High efficiency GaN-based LEDs: light extraction by photonic crystals}, DOI= "10.1051/anphys:2007003", url= "http://dx.doi.org/10.1051/anphys:2007003", journal = {Ann. Phys. Fr.}, year = 2006, volume = 31, number = 6, pages = "1-235", }