Surface radiation-regulation effect in Eu(BA)3Phen doped polyacrylonitrile nanofibers.

Electrospun nanofibers of Eu(BA) 3 Phen doped polyacrylonitrile (PAN) have been prepared and the surface radiation-regulation effect of flexible fibers is revealed. Fluorescence contrast between bulks and nanofibers confirmed that the fibrosis process facilitated spectral reshaping and enhanced energy transfer efficiency of ligands to rare earth ions. Due to the enhanced surface radiation-regulation effect, the quantum efficiency of Eu(BA) 3 Phen/PAN nanofibers remains on an upward tendency as Eu(BA) 3 Phen content increasing, and the maximum quantum efficiency of fibers reaches to 86.7%. Large emission cross-section and high radiation transition probability for 5D 0 → 7F 2 of Eu3+ reach up to 4.043 × 10−21 cm2 and 518.79 s−1, respectively, which indicates that the europium-complexes/PAN nanofibers possess great emissive ability. Accordingly, the nano-sized rare-earth fluorescence materials with high quantum efficiency and excellent flexibility obtained by electrospun fibrosis compensate the brittle defects of bulks, which provides a breakthrough in developing light-converting materials. Nanoscale Eu(BA) 3 Phen/PAN flexible fibers with great emissive ability and high quantum efficiency provide a breakthrough in developing light-converting materials. [Display omitted] • Nanoscale Eu(BA) 3 Phen/PAN polymer fibers with smooth surface were prepared. • Spectral reshaping and flexibility enhancement were achieved during fibrosis. • The σ em and A ij for 5D 0. → 7F 2 of Eu3+ reach up to 4.043 × 10−21 cm2 and 518.79 s−1. • Anomalous concentration dependency occurs due to surface radiation-regulation effect. • Bonding of great emissive ability and high QE extend light-converting film region. [ABSTRACT FROM AUTHOR]