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Updated: Feb 6, 2026

Triplet Fusion Upconversion Nanocapsule Synthesis
Published on: September 7, 2022
Triplet energy migration-based photon upconversion by amphiphilic molecular assemblies in aerated water
Hironori Kouno1, Taku Ogawa1, Shogo Amemori1
1Department of Chemistry and Biochemistry , Graduate School of Engineering , Center for Molecular Systems (CMS) , Kyushu University , 744 Moto-oka, Nishi-ku , Fukuoka 819-0395 , Japan . Email: yanai@mail.cstm.kyushu-u.ac.jp ;
Abstract:
A molecular self-assembly approach is developed to resolve an outstanding issue in triplet energy migration-based photon upconversion (TEM-UC), that is, air-stable TEM-UC in water. Amphiphilic cationic acceptor (emitter) molecules self-assemble in water via hydrophobic and hydrogen bonding interactions, with which anionic donor (sensitizer) molecules are integrated through electrostatic interactions. Triplet energy is quantitatively transferred from the excited donor to the acceptor, which is followed by effective triplet energy migration among the pre-organized acceptors. It leads to TTA and concomitant UC emission in water. The dense acceptor chromophore arrays with extended hydrogen bonding networks show efficient barrier properties against molecular oxygen, as demonstrated by the stable UC emission even in air-saturated water.
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