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Broadband Circularly Polarized Luminescence with a High Dissymmetry Factor
Liting Xu1, Ruping Lu1, Tingting Wang1
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.
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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 MnII complex with a green emission band and high quantum yield was synthesized and doped into an EVA matrix to create a luminescent EVA-MnII layer. In combination with the cholesteric liquid crystal polymer network (CLCN) film, CPL-active composite films with high |glum| values (up to 1.34) were obtained. Furthermore, when a luminescent EVA-MnII/EVA-EuIII layer emitting both red and green fluorescence was stacked with a CLCN film with double reflection bands, high |glum| values (|glum| > 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 |glum| values but also developed a method for broadband displays and anticounterfeiting.
