Pressure-Driven Phase Evolution and Optoelectronic Properties of Lead-free Halide Perovskite RbTeBr
This study investigates the high-pressure behavior of lead-free halide perovskite RbTeBr, revealing a sequence of structural phase transitions from cubic to orthorhombic and monoclinic phases, coupled with pressure-induced band-gap narrowing and non-monotonic photoluminescence changes driven by competing radiative and nonradiative relaxation mechanisms.