Upconversion Fluorescence Nanoparticles/Liquid Crystal Composite Optical Functional Materials Construction And Performance Regulation

Upconversion emission materials present strong development tendency in upconverting laser, display, bioluminescent labeling and other fields due to their unique optical property of converting short-wavelength light to long-wavelength light. At the same time, some infrared light-control smart materials display excellent application prospects from the aspect of upconcersion nanoparticles (UCNPs)/ liquid crystal composite functional materials. This topic starting from upconversion fluorescence nanoparticles and liquid crystal network polymers (LCNPs), designed and fabricated two kinds of new-type UCNPs/LCNPs composite optical functional material systems, and studied the fluorescence regulation performance of the systems in detail.This topic fabricated the UCNPs/ cholesteric liquid crystal network polymers (ChLCNPs) composite films firstly and tested the transmission and fluorescence intensity of composite films in scattering state, planar state and homeotropical state. Research shows that the fluorescence intensity of composite films in scattering state is significantly enhanced compared to homeotropic state. Based on the above research, the micro and macro upconvesion fluorescence patterns were fabricated by the method of indium-tin-oxide (ITO) glasses etching and double-exposure respectively according to UCNPs/LCNPs composite materials. Prepared fluorescent patterns canbe observed by optical magnifing devices or naked eyes.In additon, the topic fabricated upconversion nanorods(UCNRs)/nematic liquid crystal network polymers (NLCNPs) composite films and tested the upconverting fluorescence property of planar orented and homeotropical orented UCNRs/LCNPs films. Research shows that fluorescence emisson light from planar orented UCNRs/L,CNPs films is partly polarized, while the fluorescence emisson light from homeotropical orented UCNRs/LCNPs films is not polarized.In summary, this topic studied two kinds of new-type UCNPs/LCNPs composite optical functional materials and pioneers a different avenue to the construction and fluorescent regulation of UCNPs/polymer materials composite systems with prospective application value in anti-counterfeiting optical films and fluorescent displays.