Orange-blue-orange triblock one-dimensional heterostructures of organic microrods for white-light emission

1D triblock hetrostructures with striping patterns have been synthesized by doping 1,3-diphenyl-2-pyroline (DP) microrods with 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) molecules selectively at both ends. The middle stripe of triblock microds emit the blue light, while both ends emit orange light due to the efficient FET from excited DP to DCM molecules (right inset). Although triblock microrods show microarea heterogeneity in the striping pattern, they generate macroscopic high-quality white-light emission (WLE) in both the colloidal suspension (left inset) and the solid state with a photoluminescence efficiency as high as 36 +/- 5%.