“Steric armor” strategy of blue fluorescent emitters to against oxygen-induced degradation Sha-Sha Wang, Jing-Rui Zhang, Kuan-De Wang, Hao-Ran Li, Yang Zhou, Xiang Yu, Ying Wei, Quan-You Feng*, Yu-He Kan* and Ling-Hai Xie* Chin. J. Chem. 2023, 41, XXX—XXX. DOI: 10.1002/cjoc.202300XXX