The abstract is read at the publisher; the summary is JClub's.
Quantum dot photon upconversion under 1208-nm illumination achieves unprecedented anti-Stokes shifts of 1.21 and 1.26 eV, exceeding the 1.03 eV energy of a single excitation photon.
- Why it matters: Anti-Stokes shifts are limited by energy losses in multi-step energy transfer, restricting efficient conversion of low-energy NIR photons into higher-energy emission.
- What they did: The work demonstrates NIR-II excitable upconversion below the silicon bandgap (~1107 nm) using quantum dots with an ideal energy cascade (NKU-0) and nearly energy-lossless triplet fusion, plus tetracene-derivative thermal vibrations that populate high vibrational states.
- The result: Ground-state thermal vibrations promote endothermic triplet energy transfer from ligand to annihilator, substantially enlarging the anti-Stokes shift and enabling a design route for NIR-II upconversion with large shifts.
The findingWhy it mattersWhat they didThe result
AI summary of the abstract · may contain errors · not medical advice · read the paper.