Tetradentate Platinum(II) Complexes for Highly Efficient Phosphorescent Emitters and Sky Blue OLEDs
Tetradentate Platinum(II) Complexes for Highly Efficient Phosphorescent Emitters and Sky Blue OLEDs
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用于高效磷光发射体和天蓝色 OLED 的四齿铂 (II) 配合物
DOI：
10.1021/acs.chemmater.9b04263
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发表时间：
2020-01-14
影响因子：
8.6
通讯作者：
She, Yuanbin
中科院分区：
文献类型：
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作者：
Li, Guijie;Zhao, Xiangdong;She, Yuanbin
设计并合成了一系列含有稠合5/6/6金属环的四齿Pt(II)发射体。分子几何形状在确定光物理性质方面起着至关重要的作用。它们的发射光谱受到分子核心骨架的几何形状、取代基甚至氢原子及其位置的显着影响，这得到了X射线晶体学分析和理论计算的进一步支持。首次在四齿 5/6/6 Pt(II) 发射体中观察到准分子发射的产生，并发现其在溶液和固态下均与浓度相关。所有Pt(II)发射体均具有高达100%的高光致发光量子效率和短至1.4μs的室温发光寿命，实现了7.14 x 10(5) s(-1)的辐射率。通过对配体的杂芳环进行选择性合成修饰，可以轻松调整其发射颜色以覆盖整个可见光区域（λ（最大值）= 464-632 nm）。 Pt(1-ptz)基天蓝色有机发光二极管(OLED)的最大外量子效率(EQE)为14.5%，在1000 cd/m(2)的高亮度下仍保持12.7%的EQE。这项工作表明，这些四齿 Pt(II) 配合物可以作为 OLED 应用的有效磷光发射体。
A series of tetradentate Pt(II) emitters containing fused 5/6/6 metallocycles have been designed and synthesized. Molecular geometries play a critical role in determining the photophysical properties. Their emission spectra are significantly affected by the geometries of the molecular core skeletons, the substituents, even hydrogen atoms, and their positions, which are further supported by X-ray crystallographic analyses and theoretical calculations. The generation of excimer emissions is observed in the tetradentate 5/6/6 Pt(II) emitters for the first time and found to be concentration-dependent both in the solution and solid states. All of the Pt(II) emitters have high photoluminescent quantum efficiency of up to 100% and luminescent lifetime as short as 1.4 mu s at room temperature, achieving a radiative rate of 7.14 x 10(5) s(-1). Their emission color can be easily tuned to cover the whole visible region (lambda(max) = 464-632 nm) through selective synthetic modification of the heteroaromatic rings of the ligands. Pt(1-ptz)-based sky blue organic light-emitting diode (OLED) demonstrates a maximum external quantum efficiency (EQE) of 14.5%, yet maintains an EQE of 12.7% at a high brightness of 1000 cd/m(2). This work demonstrates that these tetradentate Pt(II) complexes can act as efficient phosphorescent emitters for OLED applications.