Improving Triplet-Triplet Annihilation Upconversion Output by a Triplet Mediator Approach: Mechanistic Insights on Homo and Hetero-Annihilation in Three-Component Systems.

ABSTRACT: Triplet-triplet annihilation photon upconversion (TTA-UC) is a promising strategy for converting low-energy photons into higher-energy emission, with potential applications in solar energy harvesting, bioimaging, and photocatalysis. A challenge in TTA-UC systems is minimizing the reabsorption of upconverted photons by the annihilator molecules. To address this, we present a mediator-assisted TTA-UC approach utilizing a neutral mediator molecule to facilitate upconversion in the ultraviolet (UV) and visible regions. Our study introduces a general protocol, and through detailed kinetic modeling, we elucidate the underlying mechanism, highlighting the role of hetero-TTA (triplet-triplet annihilation between the mediator and annihilator). Notably, we report the first estimation of a hetero-TTA

SUBMITTER: Kandappa SK 

PROVIDER: S-EPMC12593377 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature