Amplification and Dynamic Control of Circularly Polarized Luminescence in Poly (vinyl Alcohol)/CdSe@CdS Nanorod Assembly Twisted‐Stacking Hetero‐Structures

Abstract Chiroptical materials with strong and switchable circularly polarized luminescence (CPL) properties have gained considerable interest due to their feasible applications in optoelectronic devices, sensing, and information encryption. However, in most cases, their luminescence dissymmetry factor (g_lum) and figure of merit (FOM) values remain very low. Herein, a novel heterogeneous twisted‐stacking structure is proposed, which endows with strong CPL amplification (a maximum of ≈15‐fold enhancement) over traditional homogeneous structures and a high FOM value up to 0.11. Interestingly, their CPL performance (including the sign, magnitude, and spectral position) and the FOM values can be precisely manipulated or even inversed by simply uniaxial stretching, since the phase retardation of the anisotropic poly (vinyl alcohol) layer can be controlled. Moreover, by combining with the viologen gel electrochromic system, the in situ voltage‐driven switching and patterning of the CPL signal can be successfully achieved, with low operation voltage and good cycling stability. This study provides a creative strategy for fabricating strong and electrical switchable CPL‐active materials, which promise new opportunities in miniaturized smart electrochiroptical devices for future information technology.