Tetradentate cyclometalated platinum complex enables high-performance near-infrared electroluminescence with excellent device stability

Tetradentate cyclometalated platinum complex enables high-performance near-infrared electroluminescence with excellent device stability
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四齿环金属化铂配合物可实现高性能近红外电致发光,并具有出色的器件稳定性

DOI:
10.1016/j.cclet.2022.04.043
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发表时间:
2022-04
影响因子:
9.1
通讯作者:
Chuluo Yang
Chuluo Yang
中科院分区:
化学1区
文献类型:
--
作者:
Chengjun Wu;Youming Zhang;Jingsheng Miao;Kai Li;Weiguo Zhu;Chuluo Yang

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由于长波长非辐射跃迁的高衰减率,高效稳定的近红外(NIR)电致发光材料的分子设计仍然是一个很大的挑战。在此,一种新的四齿环化铂(II)配合物与N <$C <$C <$N协调框架已被开发和用作近红外有机发光二极管(OLED)的掺杂剂。该配合物在掺杂和纯膜中表现出短寿命(0.5-1.5 µs)的金属-配体电荷转移(MLCT)激发态。所得的NIR OLED(λEL= 730 nm)实现了5.2%的最大外量子效率(EQEmax)和74626 mW sr− 1 m-2的辐射率。值得注意的是,该器件表现出优异的稳定性,LT 90的工作寿命为119 h。这一工作证明了四齿铂(II)配合物在近红外OLED领域的巨大潜力。
Due to the high decay rate of the non-radiative transition of long wavelengths, the molecular design of efficient and stable near-infrared (NIR) electroluminescent materials remains a big challenge. Herein, a new tetradentate cyclometalated platinum(II) complex with an N∧C∧C∧N coordinated framework has been developed and used as a dopant for NIR organic light-emitting diodes (OLEDs). The complex exhibited a short-lived (0.5–1.5 µs) metal-to-ligand charge transfer (MLCT) excited state in doped and neat films. The resulting NIR OLEDs (λEL= 730 nm) achieved maximum external quantum efficiency (EQEmax) of 5.2% and radiance of 74626 mW sr−1m–2. Of note, the device exhibited excellent stability with operational lifetime of 119 h for LT90. This work demonstrated the great potential of tetradentate platinum(II) complexes in the field of NIR OLEDs.
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