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Visible light curing1 of photopolymerizable formulations is a widely used technique for modern
applications such as dental filling materials,2 reprography (photoresists, printing plates, integrated circuits), laser induced 3D curing, holographic recordings and nano-scale micromechanics. Due to the increasing demands of such applications, important components such as the photoinitiator (PI)3,4 have to be adapted, regarding reactivity, solubility, UV-Vis absorption, etc. For currently used dental filling materials, the state of the art photoinitiating system consists of camphorquinone (CQ) and ethyl 4-dimethylaminobenzoate (DMAB). Such bimolecular systems suffer from low reactivity, especially in water based formulations.5 Hydrophilic bisacylphosphine oxides feature higher reactivity,6,7 but their absorption spectra do not overlap adequately with the emission spectra of the novel LED-based dental lamps (430-490nm), which are adapted to the absorption spectrum of CQ.
