Aligned packaging of in situ grown CsPbBr3 nanorods within polystyrene nanofibers for enhanced polarized luminescence properties

Abstract

In the present work, we report a strategy for aligned packaging of in situ grown CsPbBr₃ nanorods (NRs) within polystyrene (PS) nanofibers (CsPbBr₃ NR@PS) based on magnetic field assisted electrospinning for enhanced polarized luminescence properties. The as-constructed CsPbBr₃ NR@PS fiber membrane exhibits an improved orientation and increased aspect ratio (AR) of the aligned CsPbBr₃ NRs within the PS fibers with the increase of the external magnetic field strength. Consequently, their luminescence polarization ratio (P) can be fundamentally enhanced with the increase of the external magnetic field strength. The P of the sample prepared at a magnetic field of 150 mT reaches 0.23, which is 2.6 times that of the conventional analogue fabricated without a magnetic field, and close to the theoretical emission polarization one (P_em-theory), representing their potential applications in optical devices such as liquid crystal displays.