Bai, R., Huo, P., Zheng, N., Li, Y., Yan, W., Fang, P., Zhou, X., Bian, Z., Liu, Z. (2025). 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. https://doi.org/10.1002/adma.202419849