Light output enhancement of a GaN-based light emitting diode by polymer film imprinting - Z.M. Wang; X.J. Luo; S. Wang; C.X. Luo; M.H. Sun; K. Bao; B. Zhang; G.Y. Zhang; Y.G. Wang; Y. Chen; H. Ji; Q. Ouyang (Semiconductor Science and Technology, 2007)