Uniform Luminous Perovskite Nanofibers with Color‐Tunability and Improved Stability Prepared by One‐Step Core/Shell Electrospinning. Issue 22 (30th April 2018)

• Record Type: Journal Article
• Authors: Tsai, Ping‐Chun; Chen, Jung‐Yao; Ercan, Ender; Chueh, Chu‐Chen; Tung, Shih‐Huang; Chen, Wen‐Chang
• Is Part Of: Small. Volume 14:Issue 22(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-04-30
• Subjects: core–shell -- electrospun nanofibers -- geometric confinement -- light emission -- perovskite; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201704379
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: A one‐step core/shell electrospinning technique is exploited to fabricate uniform luminous perovskite‐based nanofibers, wherein the perovskite and the polymer are respectively employed in the core and the outer shell. Such a coaxial electrospinning technique enables the in situ formation of perovskite nanocrystals, exempting the needs of presynthesis of perovskite quantum dots or post‐treatments. It is demonstrated that not only the luminous electrospun nanofibers can possess color‐tunability by simply tuning the perovskite composition, but also the grain size of the formed perovskite nanocrystals is largely affected by the perovskite precursor stoichiometry and the polymer solution concentration. Consequently, the optimized perovskite electrospun nanofiber yields a high photoluminescence quantum yield of 30.9%, significantly surpassing the value of its thin‐film counterpart. Moreover, owing to the hydrophobic characteristic of shell polymer, the prepared perovskite nanofiber is endowed with a high resistance to air and water. Its photoluminescence intensity remains constant while stored under ambient environment with a relative humidity of 85% over a month and retains intensity higher than 50% of its initial intensity while immersed in water for 48 h. More intriguingly, a white light‐emitting perovskite‐based nanofiber is successfully fabricated by pairing the orange light‐emitting compositional perovskite with a blue light‐emitting conjugated polymer. Abstract : Uniform luminous perovskite nanofibers prepared by a one‐step core/shell electrospinning technique are demonstrated herein. The optimized perovskite electrospun nanofiber yields a high photoluminescence quantum yield with improved stability. Finally, a white light‐emitting perovskite‐based nanofiber is also successfully fabricated by pairing the orange light‐emitting compositional perovskite with a blue light‐emitting conjugated polymer.