ArticleAdvanced science (Weinheim, Baden-Wurttemberg, Germany)2026
High-Efficiency TADF Dendritic Emitters Enabled by Synchronously Inhibiting Degenerated Triplet Excited States and Structural Relaxation Toward Solution-Processed OLEDs with EQE Over 33.
Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors.
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Abstract
Manufacturing high-performance solution-processed organic light-emitting diodes (OLEDs) employing thermally activated delayed fluorescence (TADF) dendritic emitters remains a formidable challenge due to the lack of efficient TADF dendrimers. Herein, a symmetry breaking strategy is adopted to construct an asymmetrical TADF dendrimer denoted as DMAC-XT-TCz. An in-depth analysis of the photophysical properties combining with theoretical calculation expose that the asymmetrical architecture of target emitter switches degenerated triplet excited states to isolated counterpart, thereby effectively breaking the degeneracy of vibrational levels and boosting the spin flip of triplet excitons. Additionally, the nonradiative decay is also suppressed due to imbedding oxygen linkage to locking electron-donating skeleton. Thus, near-unity photoluminescence efficiency and excellent reverse intersystem crossing rate of 7.8 × 10
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