Matching photoinitiator absorbance with the operational wavelength of the LED source is crucial. This paper describes how it is possible to modify the physical-chemical properties of the 3-ketocoumarins and how such modifications influence the reactivity.
Freddi, A. B.; Morone, M.; Norcini, G. (2016). Design of New 3-ketocoumarins for UV LED Curing. UV+EB Technology, Issue 3, 46–52.
Originally presented as a technical paper at RadTech 2016.