Elastomer materials with long-lasting and stable room-temperature phosphorescence have great potential in the fields of flexible electronics and photonics. However

developing such materials remains a daunting challenge. Here

we report a highly stretchable and mechanically strong sustainable luminescent room-temperature phosphorescent covalent organic framework elastomer (SPU-D230-UPy COF) material. The material is composed of an alkyl chain soft segment and a limited covalent organic framework containing multiple hydrogen bonding hard segments. These prepared elastomers exhibit high mechanical properties and high elasticity

and exhibit bright and sustained luminescence after removal of 365 nm excitation (luminescence time lasts for 3.0 seconds). Mechanical studies show that the obtained material exhibits a strength of ∼33.5 MPa and excellent toughness of ∼188.26 MJ m-3

with a Young's modulus of ∼76.6 MPa. Impressively

these elastomers maintain strong optical properties even under repeated mechanical deformation

an unprecedented property. These outstanding properties make these long-lasting luminescent elastomers ideal for potential applications in wearables

flexible displays

and anti-counterfeiting devices.