摘要
Multicolor circularly polarized luminescence(CPL)materials show considerable potential in the field of advanced anticounterfeiting.However,it remains challenging to achieve stable inorganic materials with multicolor CPL.In this work,for the first time,chiroptical rare earth(RE)fluoride nanoparticles induced by helical silica are obtained through a facile in situ assembly strategy.The influence of assembly ratio and morphological structure on the luminescence dissymmetry factor(glum)has been systematically investigated,leading to an optimized glum value of 4.7×10^(-3).By adjusting the types and concentrations of RE dopants(Ce^(3+),Tb^(3+),Eu^(3+)),the nanocomposites exhibit multicolor CPL and time-resolved photoluminescence characteristics.Remarkably,these nanocomposites retain their CPL activity even after calcination at 400◦C.Leveraging the visible multicolor emissions,along with the hidden dynamic and chiroptical signals,the nanocomposites are successfully applied in high-security anti-counterfeiting patterns and multilevel optical encryption codes.
基金
supported by the National Key Research and Development Program of China(No.2022YFB3503700)
the NSFC(Nos.12174392,22175179,22135008,U22A20398)
the Self-deployment Project Research Program of Haixi Institutes,Chinese Academy of Sciences(Nos.CXZX-2022-GH10,CXZX-2022-GS01).
