Electrospinning scalable and multicolor nanofibers with controlled organic excimers/exciplexes for flexible displays

Nanofibers exhibiting high fluorescence quantum yield, superior flexibility, and uniform luminescence are of significant interest in both fundamental scientific research and practical applications, particularly within the realms of fluorescent sensors, intelligent displays, and illumination technologies. Nevertheless, achieving a costeffective and scalable synthesis of fluorescent nanofibers with tunable emission properties remains a significant challenge, primarily due to the intricate design considerations associated with the encapsulation of emitters within nanofiber matrices. Herein, we originally presented the scalable multi-color fluorescent nanofibers by encapsulating excimers or exciplexes into polymers through a facile electrostatic spinning process. The excimer/ exciplex degree by finely modulating it-it/charge transfer (CT) interactions could realize the controlled red-shift emission toward multi-color emissions ranging from 450 to 657 nm. Impressively, white emissive nanofibers with a Commission Internationale de l'Eclairage (CIE) of (0.333, 0.349) and temperature-responsive fluorescent nanofibers were successfully prepared via precisely adjusting the ratio of excimer/exciplex aggregations. These fluorescent nanofibers demonstrate excellent flexibility, enduring cyclic tensile for more than 10 times at a rate of 20 mm/min. This work provides valuable insights into the large-area fabrication of multi-color fluorescent nanofibers and the advancement of wearable display technologies.