<p>Metal-halide perovskites are gaining significant attention as highly promising materials for next-generation solar cells and optoelectronic devices. However, their structural responses under combined optical, electrical, thermal, and mechanical fields remain insufficiently understood, hindering their practical applications. This study introduces an opto-electro-thermo-elastic model for lead halide perovskites, incorporating photostriction, photothermal effects, electrostriction, and piezoelectricity, to analyze their buckling and vibration behaviors under multi-physical interactions. The governing equations for perovskite plates are formulated based on third-order shear deformation theory and solved analytically using the Navier method. Extensive parametric studies explore the effects of multi-physical fields on key performance metrics, including critical light intensity, critical electric field, critical temperature, and free vibration. The results demonstrate that light exposure, photo-induced heating, and external electric fields significantly influence natural frequencies, and bifurcation buckling. These factors must be carefully considered in the design of perovskite-based optoelectronic systems to optimize performance and reliability.</p>