We present the synthesis and characterisation of a series of encap-sulated diketopyrrolopyrrole red-emitting conjugated polymers. The novel materials display extremely high fluorescence quantum yields in both solution (>70%) and thin film (>20%). Both the absorption and emission spectra show clearer, more defined features compared to their naked counterparts demonstrating the suppression of inter and intra-molecular aggregation. We find that the encapsulation results in decreased energetic disorder and a dramatic increase in backbone co-linearity as evidenced by STM. This study paves the way for DPP to be used in emissive solid state applications and demonstrates a novel method to reduce structural disorder in conju-gated polymers
