高效且空气稳定的镧系铕配合物：有机发光二极管中的新型发光体。
Highly Efficient and Air-Stable Lanthanide Eu Complex: New Emitter in Organic Light Emitting Diodes.
作者信息
Zhan Ge, Wang Liding, Zhao Zifeng, Fang Peiyu, Bian Zuqiang, Liu Zhiwei
机构信息
Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
出版信息
Angew Chem Int Ed Engl. 2020 Oct 19;59(43):19011-19015. doi: 10.1002/anie.202008423. Epub 2020 Aug 24.
Luminescent Eu complexes with a characteristic 5d-4f transition have potential applications in many fields. However, their instability in ambient conditions impedes further exploration and application. Herein, we report two new Eu complexes, bis[hydrotris(3-trifluoromethylpyrazolyl)borate]europium(II) (Eu-1) and bis[hydrotris(3-methylpyrazolyl)borate]europium(II) (Eu-2). Intriguingly, the blue emissive Eu-1 showed high air stability arising from fluorine protection and close molecular packing, as maintaining a photoluminescence quantum yield (PLQY) of 91 % (initial 96 %) upon exposure to air over 2200 hours. While the orange emissive Eu-2 showed a maximum luminance of 30620 cd m , and a maximum external quantum efficiency (EQE) of 6.5 %, corresponding to an exciton utilization efficiency around 100 % in organic light-emitting diodes (OLEDs). These results could inspire further research on stable and efficient Eu complexes and their application in OLEDs.
具有特征性5d-4f跃迁的发光铕配合物在许多领域具有潜在应用。然而，它们在环境条件下的不稳定性阻碍了进一步的探索和应用。在此，我们报道了两种新型铕配合物，双[氢三(3-三氟甲基吡唑基)硼酸根]铕(II)（Eu-1）和双[氢三(3-甲基吡唑基)硼酸根]铕(II)（Eu-2）。有趣的是，蓝色发光的Eu-1由于氟保护和紧密的分子堆积而表现出高空气稳定性，在暴露于空气中超过2200小时后仍保持91%（初始为96%）的光致发光量子产率（PLQY）。而橙色发光的Eu-2在有机发光二极管（OLED）中表现出最大亮度为30620 cd m ，最大外量子效率（EQE）为6.5%，对应激子利用效率约为100%。这些结果可能会激发对稳定高效铕配合物及其在OLED中应用的进一步研究。
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