Enhanced ultraviolet-blue emission and Raman modes in ZnO:Cr2O3 composite nanoparticles Thangaraj Pandiyarajan, Mauro L. Baesso and Balasubramanian Karthikeyan Eur. Phys. J. D, 68 2 (2014) 28 Published online: 13 February 2014 DOI: 10.1140/epjd/e2013-40363-3