The excess electronic energy of the order of a hundred meV, which is way larger than ELO, cools down at charges typical of acoustic phonon scattering, as proven in Fig. eight for polycrystalline MAPbI3 and single-crystal MAPbBr3 . A comparability of HOIP single crystals with their all-inorganic counterpart at room temperature confirmed long-lived sizzling PL […]