Authors: Paul Zavala-Rivera; Kevin Channon; Vincent Nguyen; Easan Sivaniah; Dinesh Kabra; Richard H Friend; S K Nataraj; Shaheen A Al-Muhtaseb; Alexander Hexemer; Mauricio E Calvo; Hernan Miguez Journal: Nat Mater Date: 2011-11-27 Impact factor: 43.841