Stretchable and Ambient Stable Perovskite/Polymer Luminous Hybrid Nanofibers of Multicolor Fiber Mats and Their White LED Applications

We report the fabrication and optical/mechanical properties of perovskite/thermoplastic polyurethane (TPU) based multicolor luminescent core-shell nanofibers and their large-scale fiber mats. One-step coaxial perovskite/TPU nanofibers had a high PLQY value exceeding 23.3% surpassing its uniaxial counterpart, due to the homogeneous distribution of perovskite NPs by the confinement of the TPU shell. The fabricated core-shell nanofibers exhibited a high mechanical endurance owing to the well elastic properties of TPU and maintained the luminescence intensity even under a 100%-stretched state after 1000-time stretching-relaxing cycles. By taking advantage of hydrophobic nature of TPU, the ambient and moisture stability of the fabricated fibers were enhanced up to one month. Besides, large area stretchable nanofibers with a dimension of 15 cm x 30 cm exhibiting various visible-light emissions were fabricated by changing the composition of perovskite NPs. Moreover, a large-scale luminescent and stretchable fibe...