Wayne Liang
New Member
The Science Behind UV LED Curing
UV LED curing relies on the principles of photopolymerization, a process where light energy is used to trigger a chemical reaction that converts a liquid material into a solid state. The UV LEDs emit light in the ultraviolet spectrum, typically between 200nm to 400nm, which is absorbed by photoinitiators present in the formulation of the material being cured.a. Photopolymerization Process
When UV light is absorbed by photoinitiators, these molecules undergo a transformation that generates reactive species such as free radicals or cations. These reactive species initiate the polymerization of monomers and oligomers, leading to the formation of a cross-linked polymer network. This process happens almost instantaneously, allowing the material to cure rapidly.b. UV LED Light Sources
UV LEDs are solid-state devices that emit light through electroluminescence. Unlike traditional UV lamps, which rely on mercury vapor to produce UV light, UV LEDs use semiconductor materials like gallium nitride (GaN) or gallium arsenide (GaAs) to generate light. The wavelength of the emitted light can be precisely controlled by adjusting the semiconductor material composition, allowing for the production of UV LEDs with specific wavelengths suitable for different curing applications.Do you know more application methods?