Chiral 2D Halide Perovskites with Circular Dichroism and Circularly Polarized Photoluminescence

Lan-Sheng Yang¹, Yi-Hsiu Hua¹, Chin-An Hsu¹, Yu-Chiang Chao^1*

¹Department of Physics, National Taiwan Normal University, Taipei, Taiwan

* Presenter:Yu-Chiang Chao, email:ycchao@ntnu.edu.tw

Chiral halide perovskites have attracted considerable attention because of their chiroptical, second-harmonic generation, and ferroelectricity properties and their potential application in chiroptoelectronics and chiral spintronics. However, the fundamental research of these properties is insufficient. In this work, various chiral 2D halide perovskites were synthesized using precursor solutions with various stoichiometric ratios ⟨n⟩. Their chemical composition and chiroptical properties were investigated by X-ray diffraction, circular dichroism (CD), magnetic CD (MCD), circularly polarized luminescence (CPL) and magnetic CPL (MCPL). Photoluminescence quantum yield of approximately 90 was obtained. Symmetric circular dichroism (CD) spectra were observed without an external magnetic field. Under various magnetic fields, magnetic field-induced CD features are superimposed with the intrinsic chirality-induced CD features. Circularly polarized photoluminescence spectra were observed at room temperature.

Keywords: chiral, halide perovskites, circular dichroism, circularly polarized photoluminescence, quantum dots