A new series of two-photon polymerization initiators: Synthesis and nonlinear optical properties

Abstract

Four photopolymerization initiators with D-π-D (D, donor; π, conjugation system) structure have been synthesized by solvent-free reaction and characterized by 1 H NMR spectroscopy, IR and elemental analysis. The one-photon and two-photon excited fluorescence have been investigated in different solvents. Experimental results of the one-photon and two-photon absorption cross sections show different trends in OPA and TPA ability with different substitution groups in donor units.

From Light to Structure: Photo Initiators for Radical Two‐Photon Polymerization

“…synthesized four different 2PIs with a biphenylic core and different aminoalkyl substituents (Figure 64). [134] …”

“…Similar to BTSBP, Gan et al synthesized four different 2PIs with a biphenylic core and different aminoalkyl substituents (Figure 64). [134] All Initiators exhibit a linear absorption maximum at around 400 nm with exception of BMHVB with an absorption maximum of 342 nm (Table 21). This can be explained by the ethylhydroxy substituent, because its donor ability is smaller, the absorption undergoes a hypsochromic shift.…”

“…Micro-grid fabricated with BDBVB as photo initiator. [134] Reproduced with permission from Ref. [134].…”