As highly reactive acylphosphine oxide-based photoinitiators (PIs) are limited in the application for dental materials by their absorption behavior, we were interested to prepare acylgermane 1. UV-Vis absorption maximum of the important n-pi transition was red shifted about 30 nm compared to monoacylphosphine oxides. Photo-DSC results with a dental LED lamp showed nearly the same reactivity for 1 compared to camphorquinone (CO), while monoacylphosphine oxides are not reactive. In broadband irradiation experiments, significantly higher reactivity compared to CO was found. Application-oriented tests showed sufficient storage stability of the formulation and excellent photobleaching behavior.