Benzannulation via the use of 1,2,4-triazines extends aromatic system of cyclometallated Pt(II) complexes to achieve candle light electroluminescence
Benzannulation via the use of 1,2,4-triazines extends aromatic system of cyclometallated Pt(II) complexes to achieve candle light electroluminescence
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DOI：
10.1016/j.dyepig.2020.108857
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发表时间：
2021-01-01
影响因子：
4.5
通讯作者：
Kozhevnikov, Valery N.
中科院分区：
文献类型：
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作者：
Pander, Piotr;Turnbull, Graeme;Kozhevnikov, Valery N.
这项工作描述了 1,2,4-三嗪方法在合成 (CN)-N-布尔 AND 型新型环金属化 Pt (II) 配合物中的应用。结果表明，在复杂结构中添加环戊烯单元不仅有利于高效溶液加工 OLED 器件的制造（EQE(max) = 10.7%），而且还会产生结构变化，从而产生更可溶的衍生物。最后，结果表明，通过改变 (CN)-N-布尔 AND 配体中稠合苯环的数量，可以将发射光从绿蓝色 (Phi(PL) = 0.15-0.43) 调整为黄橙色 (Phi(PL) = 0.25)。 1,2,4-三嗪方法提供了将额外的苯环融合到吡啶环中的独特机会，并提供了包含先前未探索的大型芳香系统的配体L5。结果表明，这种苯并环化是实现发射红移的有效方法，并产生可溶液加工的单一掺杂剂 OLED 器件，其发射光谱类似于烛光。
This work describes an application of 1,2,4-triazine methodology for the synthesis of novel cyclometallated Pt (II) complexes of (CN)-N-boolean AND type. It is shown that addition of a cyclopenteno unit into the complex structure not only facilitates the fabrication of efficient solution-processed OLED devices (EQE(max) = 10.7%), but also imposes structural changes leading to even more soluble derivatives. Finally, it was shown that by varying the number of fused benzene rings in the (CN)-N-boolean AND ligand it is possible to tune the emission from green-blueish (Phi(PL) = 0.15-0.43) to yellow-orange (Phi(PL) = 0.25). 1,2,4-Triazine methodology gives unique opportunity to fuse additional benzene ring into the pyridine ring and provided the ligand L5 that contained previously unexplored large aromatic system. It was shown that such benzannulation is an effective way to achieve redshift in emission and give rise to solution-pmcessable, single dopant OLED device showing emission spectrum resembling candle light.