Open access
Oct 2026
Comprehensive spectroscopic analysis of energy inversion of the lowest singlet and triplet excited states in the heptazine HzTFEX2
Detailed photophysical measurements of the non-symmetric heptazine, HzTFEX 2 , previously reported as having inverted S 1 -T 1 levels, show complex behaviour, highly dependent on environment, concentration and aggregation. Here we show that, single crystals of HzTFEX 2 show anti-Kasha S 0 ←S 2 and excim...
Carolina Francener, Hector Miranda-Salinas, Christopher J. Riggs et al.
· Nature Communications · 0 citations