According to the chemical structure, they can be divided into five categories:
1. Diphenylethylene type: used in cotton fiber and some synthetic fiber, papermaking, soap making and other industries, with blue fluorescence;
2. Coumarin type: with the basic structure of coumarone, used in celluloid, polyvinyl chloride plastics, etc., with strong blue fluorescence;
3. Pyrazoline type: used in wool, polyamide, acrylic and other fibers, with green fluorescence;
4. Benzoxide nitrogen type: used in acrylic and other fibers and polyvinyl chloride, polystyrene and other plastics, with red fluorescence;
5. Phthalimide type is used in polyester, acrylic, nylon and other fibers, with blue fluorescence.