Rigid Bridge‐Confined Double‐Decker Platinum(II) Complexes Towards High‐Performance Red and Near‐Infrared Electroluminescence
Rigid Bridge‐Confined Double‐Decker Platinum(II) Complexes Towards High‐Performance Red and Near‐Infrared Electroluminescence
复制标题
刚性桥 - 受限双层铂 (II) 配合物实现高性能红光和近红外电致发光
DOI：
10.1002/ange.202113718
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Chuluo Yang
中科院分区：
文献类型：
--
作者：
Youming Zhang;Jingsheng Miao;Jinfan Xiong;Kai Li;Chuluo Yang
高性能红色和近红外（NIR）有机发光二极管（oled）发射器的分子设计仍然是一个艰巨的任务。本文以N -去质子化α -卡波林为桥接配体，制备了一系列具有强分子内Pt⋅⋅Pt和π -π相互作用的双核铂（II）配合物。掺杂薄膜中的配合物在短寿命（τ= 0.9-2.1 μs）金属-金属-配体电荷转移三重态（3MMLCT）激发态下表现出有效的红-近红外发射。在最佳的PtII -复合物掺杂器件中，红色oled显示出高达23.3%的最大外量子效率（EQEs）。近红外oled （λEL=725 nm）的最大EQE为15.0%，辐照度为285 W sr−1m−2，这在基于离散分子发射器的器件中是前所未有的。红光和近红外器件在高亮度下都显示出很小的效率滚降。这些设备的使用寿命也很吸引人。这项工作揭示了分子内亲金属性在长波长分子发射体和电致发光中的潜力。
A molecular design to high‐performance red and near‐infrared (NIR) organic light‐emitting diodes (OLEDs) emitters remains demanding. Herein a series of dinuclear platinum(II) complexes featuring strong intramolecular Pt⋅⋅⋅Pt and π–π interactions has been developed by using N‐deprotonated α‐carboline as a bridging ligand. The complexes in doped thin films exhibit efficient red to NIR emission from short‐lived (τ=0.9–2.1 μs) triplet metal‐metal‐to‐ligand charge transfer (3MMLCT) excited states. Red OLEDs demonstrate high maximum external quantum efficiencies (EQEs) of up to 23.3 % among the best PtII‐complex‐doped devices. The maximum EQE of 15.0 % and radiance of 285 W sr−1m−2for NIR OLEDs (λEL=725 nm) are unprecedented for devices based on discrete molecular emitters. Both red and NIR devices show very small efficiency roll‐off at high brightness. Appealing operational lifetimes have also been revealed for the devices. This work sheds light on the potential of intramolecular metallophilicity for long‐wavelength molecular emitters and electroluminescence.