<p>Mn²⁺ doping provides an effective approach to modulate the photoluminescence (PL)and X-ray scintillation properties of metal halide perovskites (MHPs); however, strategies to achieve customizable luminescence through structural design remain challenging. Here, 1D CsCdBr₃, 1D/0D Cs₇Cd₃Br₁₃, and 0D Cs₃CdBr₅ hosts were precisely synthesized via reactant ratio control. The different host structures were designed to induce distinct Mn²⁺ coordination environments, resulting in structure-dependent red, yellow, and green emission. The effects of Mn²⁺ incorporation on the photoluminescence and X-ray scintillation of different hosts were systematically studied through combined experimental and theoretical approaches. Warm white light-emitting diode (LED) fabricated from a mixture of the three compounds exhibited high color rendering (Ra = 91.4), a correlated color temperature of 4201&#xa0;K, and CIE coordinates of (0.37, 0.38), demonstrating high-performance solid-state lighting. Flexible scintillator films embedded in a polydimethylsiloxane (PDMS) matrix showed excellent radioluminescence stability and high spatial resolution under X-ray irradiation. Notably, CsCdBr₃:Mn displayed superior X-ray imaging performance (23.6 lp/mm) due to its high atomic packing factor and density. This work establishes a host structure guided strategy for constructing specific Mn polyhedra, offering a promising approach to developing multifunctional, high-performance solid-state lighting and flexible X-ray scintillator materials.</p> Graphical abstract <p></p>