(Ph₄P)₂SbCl₅ 纳 米 晶/ PVDF 复 合 纤 维 薄 膜 及 偏 振 发 光 性 能

Novel materials with polarized luminescence characteristics have the advantages of easy integration and low energy consumption in the field of display, and are expected to replace traditional polarizers to achieve miniaturization of devices. As a new type of luminescent material, lead-free metal halides have significant advantages such as low toxicity, adjustable band gap, high photoluminescence quantum yield (PLQY), and solution processing, thus showing important potential applications in the field of display. In this paper, (Ph₄P)₂SbCl₅ nanocrystals/PVDF (polyvinylidene fluoride) composite fiber films with polarized luminescence properties were prepared in situ by electrospinning using antimony-based organic-inorganic hybrid lead-free metal halides as the material system. Transmission electron microscope (TEM) results showed that(Ph₄P)₂SbCl₅ nanocrystals in the(Ph₄P)₂SbCl₅/PVDF composite film exhibited nanorod morphology with a diameter of about 30 nm and distributed along the fiber axis. The(Ph₄P)₂SbCl₅ nanocrystals/PVDF composite film exhibits uniform orange-red luminescence with an emission peak located at 600 nm, with a degree of polarization of 0. 5, and the PLQY reaches 58.7%. The high polarized emission of the composite nanofiber film originates from the oriented transition dipole moment of the luminescent centers and the dielectric confinement effect of the PVDF matrix. Finally, a fluorescence-conversion-type orange-red LED device was fabricated using this composite nanofiber film as the fluorescence conversion layer and an ultraviolet light-emitting diode (UV LED) chip as the excitation source. The as-prepared (Ph₄P)₂SbCl₅/PVDF polarized luminescence composite nanofiber film demonstrates promising potential for application in new display devices.