White Electroluminescence from Star-like Single Polymer Systems: 2,1,3-Benzothiadiazole Derivatives Dopant as Orange Cores and Polyfluorene Host as Six Blue Arms

By incorporating six blue emissive polyfluorene arms into star-shaped orange emissive cores, two kinds of star-like white electroluminescent single-polymer systems are designed and synthesized. Energy transfer from the polyfluorene arms to the orange emissive cores is observed and a concentration quenching effect is effectively suppressed. Through thermal annealing, a highly efficient white emissive single-layer device is achieved with CIE coordinates of (0.33, 0.35) and a current efficiency of 18.01 cd A(-1).