Growth and properties of Dy-doped GaN nanowires Y. P. Cao, F. Shi, H. B. Sun, W. J. Liu, Y. F. Guo and C. S. Xue Eur. Phys. J. Appl. Phys., 50 1 (2010) 10602 Published online: 26 February 2010 DOI: 10.1051/epjap/2010013