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Carbene–Metal Complexes As Molecular Scaffolds for Construction of through-Space Thermally Activated Delayed Fluorescence Emitters
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-01-17 , DOI: 10.1021/acs.inorgchem.1c03371
Armands Ruduss 1 , Baiba Turovska 2 , Sergey Belyakov 2 , Kitija A Stucere 3 , Aivars Vembris 3 , Kaspars Traskovskis 1
Affiliation  

The through-space charge transfer (CT) process is observed in Cu(I) carbene–metal–amide complexes, where conventional imidazole or imidazoline N-heterocyclic (NHC) carbene fragments act as inert linkers and CT proceeds between a metal-bound carbazole donor and a distantly situated carbene-bound phenylsulfonyl acceptor. The resulting electron transfer gives a rise to efficient thermally activated delayed fluorescence (TADF), characterized with high photoluminescence quantum yields (ΦPL up to 90%) and radiative rates (kr) up to 3.32 × 105 s–1. The TADF process is aided by fast reverse intersystem crossing (rISC) rates of up to 2.56 × 107 s–1. Such emitters can be considered as hybrids of two existing TADF emitter design strategies, combining low singlet–triplet energy gaps (ΔEST) met in all-organic exciplex-like emitters (0.0062–0.0075 eV) and small, but non-negligible spin–orbital coupling (SOC) provided by a Cu atom, like in TADF-active organometallic complexes.

中文翻译:

卡宾-金属配合物作为分子支架用于构建空间热激活延迟荧光发射器

在 Cu(I) 卡宾-金属-酰胺配合物中观察到空间电荷转移 (CT) 过程,其中传统的咪唑或咪唑啉 N-杂环 (NHC) 卡宾片段充当惰性接头,CT 在金属结合的咔唑之间进行供体和位于远处的卡宾结合的苯磺酰基受体。由此产生的电子转移产生了高效的热激活延迟荧光 (TADF),其特点是具有高光致发光量子产率 (Φ PL高达 90%) 和高达 3.32 × 10 5 s –1的辐射率 ( k r ) 。高达 2.56 × 10 7 s –1的快速反向系统间穿越 (rISC) 速率有助于 TADF 过程. 这种发射器可以被认为是两种现有 TADF 发射器设计策略的混合体,结合了低单重态-三重态能隙 (Δ E ST ) 在全有机类激发复合体发射器 (0.0062–0.0075 eV) 和小但不可忽略的自旋- 由 Cu 原子提供的轨道耦合 (SOC),如 TADF 活性有机金属配合物。
更新日期:2022-01-31
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