Exceptionally fast radiative decay of a dinuclear platinum complex through thermally activated delayed fluorescence.
Exceptionally fast radiative decay of a dinuclear platinum complex through thermally activated delayed fluorescence.
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DOI：
10.1039/d1sc00160d
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发表时间：
2021-03-22
期刊：
影响因子：
8.4
通讯作者：
Dias FB
中科院分区：
文献类型：
--
作者：
Pander P;Daniels R;Zaytsev AV;Horn A;Sil A;Penfold TJ;Williams JAG;Kozhevnikov VN;Dias FB
制备了一种新型的双核铂（ii）配合物，其特征是双四齿配体。配体为每个金属离子提供平面O^N^C^N配位环境，两个金属离子与桥接嘧啶单元的氮原子结合。在脱氧甲基环己烷溶液中，该配合物在红光区发光明亮，室温下的光致发光量子产率为83%，激发态寿命极短，为2.1 μs。这些性质是由于其辐射速率常数异常高，约为4 × 105 s−1，该值与性能最好的Ir（iii）配合物相当。这种不寻常的行为是有效的热激活反向系统间交叉的结果，由只有69±3 meV的小单重态-三重态能量差促进。该配合物被纳入溶液处理的oled中，EQEmax = 7.4%。我们认为，这是第一个充分证明Pt（ii）配合物在室温下显示热激活延迟荧光（TADF）的报道，也是第一个将Pt（ii）基延迟荧光发射器纳入OLED的报道。高效的热激活延迟荧光（TADF）在明亮发光的二铂（ii）复合体导致显著增强的辐射衰减率。
A novel dinuclear platinum(ii) complex featuring a ditopic, bis-tetradentate ligand has been prepared. The ligand offers each metal ion a planar O^N^C^N coordination environment, with the two metal ions bound to the nitrogen atoms of a bridging pyrimidine unit. The complex is brightly luminescent in the red region of the spectrum with a photoluminescence quantum yield of 83% in deoxygenated methylcyclohexane solution at ambient temperature, and shows a remarkably short excited state lifetime of 2.1 μs. These properties are the result of an unusually high radiative rate constant of around 4 × 105 s−1, a value which is comparable to that of the very best performing Ir(iii) complexes. This unusual behaviour is the result of efficient thermally activated reverse intersystem crossing, promoted by a small singlet–triplet energy difference of only 69 ± 3 meV. The complex was incorporated into solution-processed OLEDs achieving EQEmax = 7.4%. We believe this to be the first fully evidenced report of a Pt(ii) complex showing thermally activated delayed fluorescence (TADF) at room temperature, and indeed of a Pt(ii)-based delayed fluorescence emitter to be incorporated into an OLED. Efficient thermally activated delayed fluorescence (TADF) in a brightly luminescent diplatinum(ii) complex results in significant enhancement of the radiative decay rate.
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影响因子：
4.6
作者：
Culham, Stacey;Lanoe, Pierre-Henri;Kozhevnikov, Valery N.
通讯作者：
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影响因子：
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作者：
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影响因子：
4.6
作者：
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