Thermo‐responsive circularly polarized luminescence from carbon quantum dots in a cellulose‐based chiral nematic template
Haidong Shi, Jiaxin Zhu, Yaxuan Deng, Yanling Yang, Changxing Wang, Yihan Liu, Wanlong Zhang, Dan Luo, Da Chen, Yue Shi
Abstract
Abstract Circularly polarized light emitting active materials are of great interest, and the convenient tuning of the circularly polarized luminescence (CPL) remains a significant challenge. Integrating fluorescent materials into chiral photonic crystals to achieve tunable CPL is a promising approach, allowing efficient manipulation of CPL by adjusting the photonic band gap (PBG). We combined carbon quantum dots (CQDs) with hydroxypropyl cellulose (HPC), which self‐assembles into a cholesteric liquid crystal (CLC). The helical structure can selectively reflect right circularly polarized (RCP) light, achieving strong circular dichroism (CD) and high CPL dissymmetry factor g lum . In addition, the chiral template is thermo‐responsive. The CPL wavelength can be adjusted by regulating the PBG position through temperature adjustment, while the chirality of CPL keeps high especially in the heating process. This work enables stimuli‐responsive manipulation of CPL under one template through temperature regulation, which may open up enormous possibilities for the cellulose‐based material in different areas.