We present herein the properties of a highly reactive type I photoinitiator with significant 2PA cross-sections (δ720nm ∼ 90 GM). We demonstrate that this new type of photocleavable system exhibits very efficient two-photon polymerization abilities with performances amplified by more than two orders of magnitude with regards to those of a commercially available type I photoinitiator (Lucirin TPO-L) which is extensively employed for multiphoton 3D stereolithography.