Han, B., Qing, Y., Yu, R., Liu, Z., Dang, Q., Li, H., Lv, Q., Zhang, C., Han, Y., Zhang, Y., Ma, P., Li, C., Sha, S., Hou, Q., Zhao, B., Tan, Z. (2026). Cation‐Mediated Low‐Frequency Phonon Suppression in Lead‐free Manganese Halides for High‐efficiency Green Light‐emitting Diodes. Advanced Materials. https://doi.org/10.1002/adma.202510599