系统间交叉
有机发光二极管
荧光
钯
分子内力
光化学
激发态
二极管
材料科学
过渡金属
金属
化学
光电子学
单重态
纳米技术
催化作用
立体化学
原子物理学
光学
物理
冶金
生物化学
图层(电子)
作者
Jian‐Gong Yang,Xingyu Feng,Nengquan Li,Jiayu Li,Xiu‐Fang Song,Ming‐De Li,Ganglong Cui,Jingling Zhang,Chenglin Jiang,Chuluo Yang,Kai Li
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2023-06-16
卷期号:9 (24)
被引量:2
标识
DOI:10.1126/sciadv.adh0198
摘要
Transition metal complexes exhibiting thermally activated delayed fluorescence (TADF) remain underdeveloped for organic light-emitting diodes (OLEDs). Here, we describe a design of TADF Pd(II) complexes featuring metal-perturbed intraligand charge-transfer excited states. Two orange- and red-emitting complexes with efficiencies of 82 and 89% and lifetimes of 2.19 and 0.97 μs have been developed. Combined transient spectroscopic and theoretical studies on one complex reveal a metal-perturbed fast intersystem crossing process. OLEDs using the Pd(II) complexes show maximum external quantum efficiencies of 27.5 to 31.4% and small roll-offs down to 1% at 1000 cd m-2. Moreover, the Pd(II) complexes show exceptional operational stability with LT95 values over 220 hours at 1000 cd m-2, benefiting from the use of strong σ-donating ligands and the presence of multiple intramolecular noncovalent interactions beside their short emission lifetimes. This study demonstrates a promising approach for developing efficient and robust luminescent complexes without using the third-row transition metals.
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