期刊
CHEMICAL ENGINEERING JOURNAL
卷 426, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131169
关键词
Multi-resonance; Thermally activated delayed fluorescence; Heavy-atom effect; Reverse intersystem crossing; Organic light-emitting diodes
资金
- National Natural Science Foundation of China [21805195, 91833304]
- Shenzhen Science and Technology Program [KQTD20170330110107046, JCYJ20190808151209557]
The development of MR-TADF materials, incorporating sulfur atom into the B-N based framework, has led to significant improvements in the performance of organic light-emitting diodes, resulting in highly efficient green emission with maximum external quantum efficiency.
As one type of latest emitters with simultaneous high efficiency and color-purity, the development of multi resonance thermally activated delayed fluorescence (MR-TADF) materials represents an important advancement for organic light-emitting diodes (OLEDs). We herein present a new strategy to improve the performance of MR-TADF emitters by fusing sulfur element into the B-N based framework, aiming to utilize the non-metal heavy atom effect in accelerating the reverse intersystem crossing (RISC) process of the emitter. Two compounds, namely 2PTZBN and 2PXZBN, were developed in this work through rigidifying the DABNA-1 skeleton by sulfur or oxygen atoms. The theoretical calculations and photoluminescence studies reveal that the sulfur-incorporated 2PTZBN enable considerable rate constant of RISC (kRISC) up to 2.8 x 10(5) s(-1) in toluene due to larger spin-orbital coupling (SOC) values and smaller singlet-triplet energy splitting (Delta EST) compared with 2PXZBN. Consequently, organic light-emitting diodes based on 2PTZBN exhibited highly efficient green emission with maximum external quantum efficiency (EQE) of 25.5%.
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