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photoinitiator

Photoinitiator, also known as photosensitizer or photocuring agent, is a kind of synthetic agent that can absorb the energy of certain wavelength in the ultraviolet region (250 ~ 420nm) or the visible region (400 ~ 800nm) and produce free radicals and cations.
To initiate monomer polymerization of cross-linked cured compounds.

The initiator molecule has a certain light absorption ability in the ultraviolet region (250-400 nm) or visible region (400-800 nm). After absorbing light energy directly or indirectly, the initiator molecule transitions from the ground state to the excited singlet state, and then jumps to the excited triplet state through the intersystem.
After excited singlet or triplet states undergo monomolecular or bimolecular chemical reactions, active fragments that can initiate polymerization of monomers are produced, and these active fragments can be free radicals, cations, anions, etc.
According to different initiation mechanisms, photoinitiators can be divided into free radical polymerization photoinitiators and cationic photoinitiators, among which the free radical polymerization photoinitiators are the most widely used.