Highly Efficient Red-Emitting Hybrid Polymer Light-Emitting Diodes via Forster Resonance Energy Transfer Based on Homogeneous Polymer Blends with the Same Polyfluorene Backbone - Lee,BR; Lee,W; Thanh,LN; Park,JS; Kim,J-S; Kim,JY; Woo,HY; Song,MH (ACS APPLIED MATERIALS & INTERFACES, 2013)