Related Experiment Video
Updated: Aug 6, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
Sustainable Visible-Light Photoinitiation Enabled by a Bio-Based Photosensitizer/Oxime Ester Combination via
Kaidan Yang1,2, Margot Manivel3, Coralie Ohl1,2
1Université de Haute-Alsace, CNRS, IS2M UMR7361, F-68100Mulhouse, France.
Abstract:
AC:AC:Visible-light photopolymerization offers safer processing, lower energy input, and broader compatibility with advanced manufacturing than thermally initiated curing or short-wavelength UV processes. However, sustainable photoinitiating systems that operate efficiently under visible light remain limited. Here, a sustainable two-component strategy is reported by combining bio-derived oxime esters with natural or bio-inspired photosensitizers for 405 nm curing. Among the systems investigated, the synthesized oxime ester (OXE1) and menadione (MD, vitamin K3) pair show the best performance, enabling rapid photopolymerization of TMPTA with good formulation homogeneity, low coloration, and good storage stability. Electrochemical analysis and excited-state energetics indicate that direct single-electron transfer between MD and OXE1 is thermodynamically unfavorable. In contrast, steady-state photolysis, laser flash photolysis, CO2 evolution, and ESR spin trapping support a triplet-triplet energy transfer pathway, followed by N-O bond cleavage and decarboxylation, to generate initiating radicals. This work establishes a simple sensitization principle for converting UV-responsive bio-derived oxime esters into visible-light photoinitiators and provides a sustainable design strategy for photopolymerization and 3D microfabrication.
More Related Videos
06:08Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
10:21Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
Related Concept Videos
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
The Z-Scheme of Electron Transport in Photosynthesis
Photoreceptors and Visual Pathways
Oxygenic Photosynthesis
Photosystem I
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Photosystem II
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...