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<p>Donor-acceptor (D-A) conjugated polymers are believed to be a promising skeleton for efficient thermally activated delayed fluorescence (TADF). However, it still remains a big challenge to determine the synergistic tuning between the singlet-triplet energy gap (Δ<i>E</i><sub>ST</sub>) and the oscillator strength (<i>f</i>). Aiming at this object, a polymerization site regulation has been proposed by selecting the same tetramethyl-substituted triphenylamine as the donor and thioxanthone-10,10-dioxide as the acceptor to construct D-A based TADF polymers. Such a design can preserve a small Δ<i>E</i><sub>ST</sub> of 40–60 meV for all polymers so as to realize a distinct TADF due to the methyl-induced steric locking, while their emission maxima remain almost unchanged. Most importantly, ongoing from 2,7-polymerization to 3,6-polymerization, the photoluminescence quantum yield is found to grow considerably from 20.0% to 79.2%, attributable to the enhanced <i>f</i> that is well adjusted under the low Δ<i>E</i><sub>ST</sub>. As a consequence, the corresponding solution-processed OLEDs achieve an improved quantum efficiency from 5.7% to 18.5% without sacrificing the color purity. The results highlight the linkage engineering as an effective strategy towards high-performance D-A-based TADF polymers.</p>

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Polymerization site regulation in D-A based TADF polymers for improved external quantum efficiency without sacrificing color purity

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Bitian Chen,
  • Xian Chen,
  • Caiyu Wang,
  • Han Si,
  • Ning Sun,
  • Liming Ding,
  • Lian Duan,
  • Junqiao Ding

摘要

Donor-acceptor (D-A) conjugated polymers are believed to be a promising skeleton for efficient thermally activated delayed fluorescence (TADF). However, it still remains a big challenge to determine the synergistic tuning between the singlet-triplet energy gap (ΔEST) and the oscillator strength (f). Aiming at this object, a polymerization site regulation has been proposed by selecting the same tetramethyl-substituted triphenylamine as the donor and thioxanthone-10,10-dioxide as the acceptor to construct D-A based TADF polymers. Such a design can preserve a small ΔEST of 40–60 meV for all polymers so as to realize a distinct TADF due to the methyl-induced steric locking, while their emission maxima remain almost unchanged. Most importantly, ongoing from 2,7-polymerization to 3,6-polymerization, the photoluminescence quantum yield is found to grow considerably from 20.0% to 79.2%, attributable to the enhanced f that is well adjusted under the low ΔEST. As a consequence, the corresponding solution-processed OLEDs achieve an improved quantum efficiency from 5.7% to 18.5% without sacrificing the color purity. The results highlight the linkage engineering as an effective strategy towards high-performance D-A-based TADF polymers.