Broadband Circularly Polarized Luminescence with a High Dissymmetry Factor

Liting Xu¹, Ruping Lu¹, Tingting Wang¹, Wei Liu¹（刘玮）*, Yi Li¹, Yonggang Yang¹（杨永刚）*

¹State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China

Inorg. Chem. 2025, 64, 15923

Abstract: Materials exhibiting circularly polarized luminescence (CPL) hold great potential for three-dimensional (3D) displays, anticounterfeiting, and optoelectronics. However, research on broadband CPL is still limited. Herein, a Mn^II complex with a green emission band and high quantum yield was synthesized and doped into an EVA matrix to create a luminescent EVA-Mn^II layer. In combination with the cholesteric liquid crystal polymer network (CLCN) film, CPL-active composite films with high |g_lum| values (up to 1.34) were obtained. Furthermore, when a luminescent EVA-Mn^II/EVA-Eu^III layer emitting both red and green fluorescence was stacked with a CLCN film with double reflection bands, high |glum| values (|g_lum| > 1) in a broad CPL band range (490–710 nm, Δλ > 200 nm) were achieved. Based on the chiral optical filtering effect of CLCN films, this work not only tuned the CPL handedness and achieved high |g_lum| values but also developed a method for broadband displays and anticounterfeiting.

Article information: https://doi.org/10.1021/acs.inorgchem.5c01916