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Europium(II) Complex with d‐f Transition: New Emitter for Blue Light‐Emitting Electrochemical Cells with an External Quantum Efficiency of 19.8%
Advanced Materials ( IF 27.4 ) Pub Date : 2025-04-05 , DOI: 10.1002/adma.202419849
Rubing Bai 1 , Peihao Huo 1 , Nanlong Zheng 1 , Yujia Li 1 , Wenchao Yan 1 , Peiyu Fang 1 , Xiaoyu Zhou 1 , Zuqiang Bian 1 , Zhiwei Liu 1
Advanced Materials ( IF 27.4 ) Pub Date : 2025-04-05 , DOI: 10.1002/adma.202419849
Rubing Bai 1 , Peihao Huo 1 , Nanlong Zheng 1 , Yujia Li 1 , Wenchao Yan 1 , Peiyu Fang 1 , Xiaoyu Zhou 1 , Zuqiang Bian 1 , Zhiwei Liu 1
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Light‐emitting electrochemical cells (LECs) have good prospects in the solid‐state lighting field due to their simple single‐layer structure and low manufacturing cost. However, the lack of high‐efficiency blue LECs limits their development and further application. To solve this problem, many luminescent materials with various mechanisms such as fluorescence, phosphorescence, and thermally‐activated delayed fluorescence are studied as emitters in LECs. Besides these materials, herein lanthanide europium(II) (Eu(II)) complex with d‐f transition is demonstrated as a new type of emitter for LECs. In detail, a blue emitting Eu(II) complex bis[hydrotris(3‐tert‐butylpyrazolyl)borate]europium(II) is dispersed into 9‐(3‐(triphenylsilyl)phenyl)‐9H‐3,9′‐bicarbazole host and tetrahexylammonium tetrafluoroborate electrolyte to make a blend film, which attains a high photoluminescence quantum yield of ≈100%. The LEC using the blend film as an active layer achieves a blue emission with Commission Internationale de L'Eclairage coordinates of (0.12, 0.18) and a record‐breaking external quantum efficiency of 19.8%, corresponding to an exciton utilization efficiency of ≈100%. This work reveals that Eu(II) complex with d‐f transition is a promising emitter toward high‐performance blue LECs, which can inspire further research on Eu(II) complex based LECs.
中文翻译:
具有 d-f 跃迁的铕 (II) 络合物:用于蓝光发射电化彩票大全软件电池的新型发射器,外部量子效率为 19.8%
发光电化彩票大全软件电池 (LEC) 由于其简单的单层结构和低制造成本,在固态照明领域具有良好的前景。然而,缺乏高效的蓝色 LEC 限制了它们的开发和进一步应用。为了解决这个问题,研究了许多具有各种机制(如荧光、磷光和热激活延迟荧光)的发光材料作为 LEC 中的发射器。除了这些材料外,本文具有 df 转变的镧系元素铕 (II) (Eu(II)) 络合物被证明是一种新型的 LEC 发射极。详细地说,蓝色发射的 Eu(II) 络合物双[氢三(3-叔-丁基吡唑基)硼酸盐]铕 (II) 分散成 9-(3-(三苯基甲硅烷基)苯基)-9H-3,9'-双咔唑主体和四海基四氟硼酸铵电解质,形成共混膜,其光致发光量子产率高达 ≈100%。使用混合膜作为有源层的 LEC 实现了蓝色发射,国际催化委员会坐标为 (0.12, 0.18),外部量子效率达到创纪录的 19.8%,相当于激子利用效率为 ≈100%。这项工作揭示了具有 d-f 转变的 Eu(II) 配合物是高性能蓝色 LEC 的有前途的发射极,这可以激发对基于 Eu(II) 配合物的 LEC 的进一步研究。
更新日期:2025-04-05
中文翻译:

具有 d-f 跃迁的铕 (II) 络合物:用于蓝光发射电化彩票大全软件电池的新型发射器,外部量子效率为 19.8%
发光电化彩票大全软件电池 (LEC) 由于其简单的单层结构和低制造成本,在固态照明领域具有良好的前景。然而,缺乏高效的蓝色 LEC 限制了它们的开发和进一步应用。为了解决这个问题,研究了许多具有各种机制(如荧光、磷光和热激活延迟荧光)的发光材料作为 LEC 中的发射器。除了这些材料外,本文具有 df 转变的镧系元素铕 (II) (Eu(II)) 络合物被证明是一种新型的 LEC 发射极。详细地说,蓝色发射的 Eu(II) 络合物双[氢三(3-叔-丁基吡唑基)硼酸盐]铕 (II) 分散成 9-(3-(三苯基甲硅烷基)苯基)-9H-3,9'-双咔唑主体和四海基四氟硼酸铵电解质,形成共混膜,其光致发光量子产率高达 ≈100%。使用混合膜作为有源层的 LEC 实现了蓝色发射,国际催化委员会坐标为 (0.12, 0.18),外部量子效率达到创纪录的 19.8%,相当于激子利用效率为 ≈100%。这项工作揭示了具有 d-f 转变的 Eu(II) 配合物是高性能蓝色 LEC 的有前途的发射极,这可以激发对基于 Eu(II) 配合物的 LEC 的进一步研究。