Extended Data Fig. 1: Phonon band structure of Cs2AgInCl6 and the zone-centre Jahn–Teller phonon mode (inset).
From: Efficient and stable emission of warm-white light from lead-free halide double perovskites
The phonon band structure was calculated by the finite-difference method with the supercell approach. The consistency of the displacement pattern of the phonon eigenvector with that of the lattice distortion during STE formation, as well as the consistency of the phonon eigenfrequency with the phonon frequency fitted from the configuration coordinate diagram, confirm that the Jahn–Teller phonon mode coupled with the photoexcited excitons is responsible for the STE formation in Cs2AgInCl6.
