用于BT.2020深蓝发射体的高效多共振热激活延迟荧光材料。
Highly efficient multi-resonance thermally activated delayed fluorescence material toward a BT.2020 deep-blue emitter.
作者信息
Ochi Junki, Yamasaki Yuki, Tanaka Kojiro, Kondo Yasuhiro, Isayama Kohei, Oda Susumu, Kondo Masakazu, Hatakeyama Takuji
机构信息
Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.
Department of Chemistry, Graduate School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan.
出版信息
Nat Commun. 2024 Apr 2;15(1):2361. doi: 10.1038/s41467-024-46619-8.
An ultrapure deep-blue multi-resonance-induced thermally activated delayed fluorescence material (DOB2-DABNA-A) is designed and synthesized. Benefiting from a fully resonating extended helical π-conjugated system, this compound has a small ΔE value of 3.6 meV and sufficient spin-orbit coupling to exhibit a high-rate constant for reverse intersystem crossing (k = 1.1 × 10s). Furthermore, an organic light-emitting diode employing DOB2-DABNA-A as an emitter is fabricated; it exhibits ultrapure deep-blue emission at 452 nm with a small full width at half maximum of 24 nm, corresponding to Commission Internationale de l'Éclairage (CIE) coordinates of (0.145, 0.049). The high k value reduces the efficiency roll-off, resulting in a high external quantum efficiency (EQE) of 21.6% at 1000 cd m.
设计并合成了一种超纯深蓝色多共振诱导热激活延迟荧光材料（DOB2-DABNA-A）。得益于完全共振的扩展螺旋π共轭体系，该化合物具有3.6 meV的小ΔE值和足够的自旋-轨道耦合，以表现出高的反向系间窜越速率常数（k = 1.1×10 s）。此外，制备了一种以DOB2-DABNA-A作为发光体的有机发光二极管；它在452 nm处呈现超纯深蓝色发射，半高宽小至24 nm，对应于国际照明委员会（CIE）坐标（0.145, 0.049）。高k值降低了效率滚降，在1000 cd m时产生了21.6%的高外量子效率（EQE）。
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