Room‐Temperature Phosphorescent Elastomer with High Luminescent and Mechanical Performances Enabled by Multiple Hydrogen Bonding

Abstract Room‐temperature phosphorescent elastomer is promising for flexible electronics. However, preparation of such elastomer with high luminescent and mechanical performances remains a challenge. In this study, a room‐temperature phosphorescent (RTP) elastomer is prepared by incorporating ureides as luminophores into hard segments of polyurethane forming multiple hydrogen bonds. Upon ultraviolet activation, the RTP elastomer shows a recorded absolute quantum yield of 72.1% and a phosphorescence lifetime of 1079 ms. It also has high mechanical properties with reprocessability. Its tensile strength and elongation at break as high as 58.3 MPa and 1160%, respectively, and its toughness reaches 299.9 MJ m −3 . Particularly, it withstands extreme strain of 1100% or 100 cycles of elongation recovery without any change in luminescent properties. The microphase separation structure with multiple hydrogen bonded hard segment phase is thought to be responsible for its high performances. Given its robust phosphorescence efficiency alongside exceptional toughness, this RTP elastomer holds promise for innovative applications in flexible electronics, information encryption, and data storage.