Recently, the use of a new family of electroluminescent copper(I) complexes—i.e., the archetypal [Cu(IPr)(3‐Medpa)][PF₆] complex; IPr: 1,3‐bis‐(2,6‐di‐iso‐propylphenyl)imidazole‐2‐ylidene; 3‐Medpa: 2,2′‐bis‐(3‐methylpyridyl)amine—has led to blue light‐emitting electrochemical cells (LECs) featuring luminances of 20 cd m⁻², stabilities of 4 mJ, and efficiencies of 0.17 cd A⁻¹. Herein, this study rationalizes how to enhance these figures‐of‐merit optimizing both device fabrication and design. On one hand, a comprehensive spectroscopic and electrochemical study reveals the degradation of this novel emitter in common solvents used for LEC fabrication, as well as the impact on the photoluminescence features of thin‐films. On the other hand, spectro‐electrochemical and electrochemical impedance spectroscopy assays suggest that the device performance is strongly limited by the irreversible formation of oxidized species that mainly act as carrier trappers and luminance quenchers. Based on all of the aforementioned, device optimization was realized using ionic additives and a hole transporter either as a host–guest or as a multilayered architecture approach to decouple hole/electron injection. The latter significantly enhances the LEC performance, reaching luminances of 160 cd m⁻², stabilities of 32.7 mJ, and efficiencies of 1.2 cd A⁻¹. Overall, this work highlights the need of optimizing both device fabrication and design toward highly efficient and stable LECs based on cationic copper(I) complexes.

中文翻译：

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基于NHC铜（I）配合物的高效稳定蓝光电化学电池的制造和设计合理化

最近，使用了一种新的电致发光铜（I）配合物家族，即原型[Cu（IPr）（3-Medpa）] [PF ₆ ]配合物；IPr：1,3-双（2,6-二异丙基苯基）咪唑-2-亚烷基; 3-Medpa：2,2'-双-（3-甲基吡啶基）胺—导致发出蓝光的电化学电池（LEC），其亮度为20 cd m ^-2，稳定性为4 mJ，效率为0.17 cd A ^-1。在此，本研究合理化了如何增强这些品质因数，从而优化了器件的制造和设计。一方面，全面的光谱学和电化学研究揭示了这种新型发射体在LEC制备常用溶剂中的降解以及对薄膜光致发光特性的影响。另一方面，光谱电化学和电化学阻抗光谱分析表明，器件的性能受到不可逆转地形成的氧化物质的强烈限制，这些氧化物质主要起载流子俘获器和亮度猝灭剂的作用。基于上述所有内容，使用离子添加剂和空穴传输剂作为主客体或多层体系结构方法来实现空穴/电子注入解耦，从而实现了器件优化。^-2，稳定性为32.7 mJ，效率为1.2 cd A ^-1。总体而言，这项工作强调了需要针对基于阳离子铜（I）配合物的高效且稳定的LEC优化器件制造和设计。