Highly Luminescent Encapsulated Narrow Bandgap Polymers Based on Diketopyrrolopyrrole

Abstract

We present the synthesis and characterization of a series of encapsulated 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 intramolecular aggregation. We find that the encapsulation results in decreased energetic disorder and a dramatic increase in backbone colinearity as evidenced by scanning tunnelling microscopy. This study paves the way for diketopyrrolopyrrole to be used in emissive solid state applications and demonstrates a novel method to reduce structural disorder in conjugated polymers.

Protein‐like Enwrapped Perylene Bisimide Chromophore as a Bright Microcrystalline Emitter Material

“…[31][32][33][34][35] PBI derivative whose solid-state absorption and emission properties fully match those in solution. [31][32][33][34][35] PBI derivative whose solid-state absorption and emission properties fully match those in solution.…”

“…[30] Interestingly,w hile by these measures solid-state fluorescence quantum yields of up to 59 %c ould indeed be achieved, the absorption and fluorescence spectra of the solid-state materials in all examples still reveal substantial electronic interactions between the PBI dyes whose large p-scaffolds appear to attract each other in sometimes rather unexpected ways with the concomitant deterioration of the fluorescence properties.In this contribution, we report as terically fully enwrapped. [31][32][33][34][35] PBI derivative whose solid-state absorption and emission properties fully match those in solution. Accordingly,m onomer-like vibronic progressions in the absorption and emission spectra and, most importantly,afluorescence quantum yield close to unity under ambient conditions were obtained.…”

“…In this contribution, we report as terically fully enwrapped. [31][32][33][34][35] PBI derivative whose solid-state absorption and emission properties fully match those in solution. Accordingly,m onomer-like vibronic progressions in the absorption and emission spectra and, most importantly,afluorescence quantum yield close to unity under ambient conditions were obtained.…”

The Effect of α‐Branched Side Chains on the Structural and Opto‐Electronic Properties of Poly(Diketopyrrolopyrrole‐alt‐Terthiophene)

“…For diketopyrrolopyrrole (DPP) based polymers, branched side chains reduce the strong π–π stacking interactions and are essential to afford solution‐processable polymers [4, 10–13] . Bulky side chains on the DPP unit reduce aggregation or even completely prevent it [14] . For DPP‐based polymers similar trends have been reported as for other conjugated polymers when the distance between the branching point and the main chain is increased [15] .…”

Protein‐like Enwrapped Perylene Bisimide Chromophore as a Bright Microcrystalline Emitter Material

“…In this contribution, we report a sterically fully enwrapped . PBI derivative whose solid‐state absorption and emission properties fully match those in solution.…”