Conjugated dyes carrying N, N-dialkylamino and ketone groups: One-component visible light Norrish type II photoinitiators

Polymerization Photoinitiators with Near-Resonance Enhanced Two-Photon Absorption Cross-Section: Towards High-Resolution Photoresists with Improved Sensitivity

“…In contrast, strong similarities are seen for the dominant radical species obtained with BDEBP and V-Shape (see below and Figure 3). By analogy with previous studies and general agreement on Michler's ketone (or related molecules 80 ) photoinitiation mechanism, 81 and taking in consideration the structural analogies between the former and V-Shape, we attribute the observed first radical species trapped with PBN to a C-centered radical in alpha position of the aliphatic chain, relative to the aniline group (aN-BDEBP = 14 G, aH-BDEBP = 2.2 G; aN-V-Shape = 14.6 G, aH-V-Shape = 2.5 G). The hyperfine coupling constants indeed fully match those previously described in literature.…”

Benzophenone derivatives as novel organosoluble visible light Type II photoinitiators for UV and LED photoinitiating systems

“…[28][29][30][31] Gao et al also developed series of stilbene-benzophenone structures for bimolecular or onecomponent visible light Type II photoinitiators. [32][33][34] In each case, they have succeeded in extending their optical absorption properties. Previously, we also developed Polymerization series of hydrogen acceptor for Type II photoinitiator.…”

Structural effect of oxazolone derivatives on the initiating abilities of dye-borate photoredox systems in radical polymerization under visible light

“…7 Several photoinitiator systems 8 that are active in the visible light region have been developed. They are based on sensitizers such as cyanine and hemicyanine, 9,10 coumarin, 11,12 acridinedione, 13,14 perylene, 15,16 hexaarylbiimidazole, 17 curcumin, 18 carbazole, 19 benzophenothiazine, benzophenoxazine, 20,21 dithienothiophene 22 derivatives and other, [23][24][25][26][27][28][29][30][31][32] and different coinitiators. 33 These systems initiate polymerization reaction by either free radical or cationic mechanism.…”