The invention belongs to the technical field of phosphorescent materials, and particularly relates to a circularly polarized room-temperature phosphorescent material based on marine polysaccharides and preparation and application thereof.The circularly polarized room-temperature phosphorescent material based on marine polysaccharides is prepared by the steps that 4-(4-bromophenyl)-
pyridine and
methyl iodide are dissolved in absolute ethyl
alcohol, a
reflux reaction is performed to prepare bromophenyl
pyridinium, and the bromophenyl
pyridinium is dissolved in absolute ethyl
alcohol; dissolving the chiral marine
polysaccharide lambda-type
carrageenan containing the negative
sulfate radical group and an achiral phosphorescent color body bromophenyl
pyridinium containing the positive
pyridine group in deionized water, performing ultrasonic heating until the solution is clear, and then gradually cooling and self-assembling to form a
lambda-type
carrageenan and bromophenyl pyridinium suspension; finally, the
lambda-type
carrageenan and bromophenylpyridinium suspension is subjected to
vacuum drying, the circularly polarized room-temperature phosphorescent thin
film material based on the marine
polysaccharide is obtained, the material property is stable, the circularly polarized room-temperature phosphorescent thin
film material can be applied to phosphorescent digital
encryption, optical anti-counterfeiting and the like, the preparation method is simple and novel, the
raw material source is wide, the cost is low, and industrial production is facilitated. The method has important significance for designing and preparing CP-RTP materials based on natural macromolecules.