By the virtues of electron-rich structure, relatively low electronic band gap and strong blue fluorescence emission, triphenylamine derivatives (TPAs) can serve as effective host units for π-conjugated thermally activated delayed fluorescence (TADF) polymer. In this work, we designed and synthesized two kinds of dual-emission TADF polymers, PTDP-5 and PTDP-10, in which the TPAs derivatives serve as the host unit and blue light emitter simultaneously, and the alkylated TADF small molecule, 2-(10H-phenothiazin-10-yl) dibenzothiophene-S, S-dioxide, serves as orange-yellow light emitter. It is proved that the TADF characteristics can be inherited by polymers effectively from TADF small molecules. By regulating the content of TPAs moieties, the emission colour of polymers can also be conveniently tuned from yellow to warm white light. The fabricated polymer light emitting diodes (PLEDs) show an EQEmax of 7.1% with Commission Internationale de l’Eclairage(CIE) coordinates of (0.42, 0.33) for PTDP-5 and an EQEmax of 4.8% with CIE coordinates of (0.46, 0.41) for PTDP-10. 

Thermally activated delayed fluorescence polymer emitters with tunable emission

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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