张晓宏教授、王凯教授及其合作者在Adv. Mater.上发表论文

作者：

Dong-Yang Chen^1,2*, Hui Wang¹, Dian-Ming Sun², Sen Wu², Kai Wang^1,3*, and Xiao-Hong Zhang^1,4*, Eli Zysman-Colman²*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nanoscience and Technology, Soochow University, 199 Ren-Ai Road, Suzhou 215123, China.

²Organic Semiconductor Centre EaStCHEM School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, UK.

³Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, Jiangsu, P.R. China.

⁴Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215123, Jiangsu, P.R. China.

摘要：

Here the utility and potential of an emitter design are demonstrated, consisting of a narrowband-emitting multiresonant thermally activated delayed fluorescent (MR-TADF) core that is decorated with a suitably higher energy donor-acceptor TADF moiety. Not only does this D–A TADF group offer additional channels for triplet exciton harvesting and confers faster reverse intersystem crossing (RISC) kinetics but it also acts as a steric shield, insulating the emissive MR-TADF core from aggregation-caused quenching. Two emitters, DtCzBN-CNBT1 and DtCzBN-CNBT2, demonstrate enhanced photophysical properties leading to outstanding performance of the organic light-emitting diodes (OLEDs). DtCzBN-CNBT2, containing a D–A TADF moiety, has a faster k_RISC (1.1 × 10⁵ s⁻¹) and higher photoluminescence quantum yield (Φ_PL: 97%) compared to DtCzBN-CNBT1 (0.2 × 10⁵ s⁻¹, Φ_PL: 90%), which contains a D–A moiety that itself is not TADF. The sensitizer-free OLEDs with DtCzBN-CNBT2 achieve a record-high maximum external quantum efficiency (EQE_max) of 40.2% and showed milder efficiency roll-off (EQE₁₀₀₀ of 20.7%) compared to the DtCzBN-CNBT1-based devices (EQE_max of 37.1% and EQE₁₀₀₀ of 11.9%).

影响因子：

27.4

分区情况：

一区

链接：

https://doi.org/10.1002/adma.202412761