Journal
MACROMOLECULES
Volume 53, Issue 22, Pages 9758-9768Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.0c02246
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Funding
- National Natural Science Foundation of China [NNSFC 21674088, 21975215]
- Scientific Research Foundation of Hunan Provincial Education Department [19A486]
- Beijing National Laboratory for Molecular Sciences [BNLMS201815]
- Hunan 2011 Collaborative Innovation Center of Chemical Engineering and Technology with Environmental Benignity and Effective Resource Utilization
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Circularly polarized luminescent materials play an increasingly important role in display equipment and optical apparatuses. Herein, we design and synthesize a kind of luminescent liquid crystalline polymer with both chirality and aggregation-induced emission groups, namely, poly(4-cholesterol formate-oxygentetraphenylethylene-methacrylate) (PT-Chol). Polarized light microscopy and X-ray scattering results show that the polymer forms a layered structure. Because of the existence of the tetraphenylethylene luminogen, the polymer shows highly efficient circularly polarized luminescence (CPL) properties with a luminescence dissymmetry factor (g(lum)) of similar to+0.45 after blending a specified amount of 4-cyano-4'-pentyl biphenyl (5CB), although the pure polymer does not show any CPL behavior in the solid state. A further experimental result shows that the mixture of PT-Chol and 5CB can form a chiral nematic liquid crystal (N*-LC) or smectic C* (Sm C*) phase in low concentration, but the complete dissolution of PT-Chol in 5CB does not result in the development of CPL properties. Gradually increasing the concentration of PT-Chol leads to the development of aggregation-enhanced emission behavior in the 5CB solution, which results in highly efficient CPL properties in the Sm C* phase. At the same time, the obtained circularly polarized luminescent material shows excellent stability, which is conducive to its applications in optoelectronic devices.
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