White Electroluminescence from a Single Polymer System: Improved Performance by Means of Enhanced Efficiency and Red‐Shifted Luminescence of the Blue‐Light‐Emitting Species

High-efficiency white electroluminescence from a single polymer is achieved by enhancing the electroluminescence efficiency and effecting a red-shift in the emission spectrum of the blue emissive species. A single-layer device of the resultant polymer exhibits a higher luminous efficiency than the nonmodified species (12.8 cd A–1, see figure) and an external quantum efficiency of 5.4 % with CIE coordinates of (0.31,0.36), exemplifying the success of the reported methodology.