Anisotropy in Bulk-like Lead Halide Perovskite Nanorods Triggers Circularly Polarized Photoluminescence

Abstract

Perovskites can be fabricated into anisotropic nanostructures, which have been reported to produce polarization in photoluminescence (PL). These structures are promising for creating polarized light sources. Here, bulk-like CsPbBr 3 nanorods (NRs) with two sizes are synthesized using liquid nitrogen freezing. The use of low-boiling-point solvents enables the self-assembly of the NRs. Surprisingly, the degree of polarization of the S-NRs is greater at room temperature, and S-NRs embedded on LED chips demonstrate promising potential as circularly polarized luminescence (CPL) emitters.The novel phenomena from the CsPbBr 3 NRs demonstrated that direct fabrication of directionally aligned nanostructures by solution processing can induce "intrinsic" chirality and achieve high polarization emission in LED devices.