Packing Adjustment Towards High Mobility Luminescent Conjugated Polymers

Abstract

Next generation display and lighting technology calls for thinner, cheaper and more-flexible unit devices. Polymer light emitting transistor (PLET), which integrates logic function of organic field effect transistor (OFET), luminescence function of organic light emitting diode (OLED), and potential mechanical properties, is believed to be the raising star in this field. However, great challenges remain in developing the core materials of PLETs, which simultaneously require the integration of high ambipolar mobility and strong solid-state luminescence properties. Herein, high mobility luminescent thienopyrroledione-benzodiathiadiazole-fluorene-based conjugated polymer was chosen as polymer backbone, and polymers TBT-1 and TBT-2 (TBT= thienopyrroledione-benzodiathiadiazole-thienopyrrole-dione) with red luminescence were obtained by direct arylation polymerization (DArP). By introducing linear alkyl side chains, the packing orientation is changed from face-on in TBT-1 thin film to edge-on in TBT-2 thin film, which is beneficial for improving the field effect performance. The average hole and electron mobility of TBT-2 are 1.1×10⁻² and 2.0×10⁻³ cm²·V⁻¹·s⁻¹, respectively. This work provides new design strategy for high mobility luminescent conjugated polymers, which can be used in PLETs.

Keywords

Polymer light emitting transistor / Strong solid-state emission / High ambipolar mobility / Side-chain engineering / Packing adjustment

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