Heptazine-Assisted Multi-Resonance TADF Emitters With Fast Reverse Intersystem Crossing for Efficient Solution-Processed OLEDs.

ABSTRACT: The development of solution-processed organic light-emitting diodes (SP-OLEDs) with narrowband emission, high brightness, and minimal efficiency roll-off remains a significant challenge. Herein, we report a series of heptazine-assisted multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters for high-performance SP-OLEDs. By integrating a heptazine core with one to three MR units (tBuCzBN), we synthesized three emitters (HAP-CzBN, HAP-2CzBN, and HAP-3CzBN) exhibiting excellent photoluminescence quantum yields and progressively reduced singlet-triplet energy gaps (ΔE_ST) with increasing MR content. Among these, HAP-2CzBN and HAP-3CzBN show green and yellow emission at 537 and 556 nm with small full widths at half maximum (FWHM) of 43 and 45 nm in toluene, respec

SUBMITTER: Si C 

PROVIDER: S-EPMC12921348 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature