Phosphor Synthesis Methods: A Comprehensive Review of Conventional, Wet-Chemical, Assisted, Mechanochemical and Emerging Routes

Abstract

Phosphors are functional luminescent solids in which host lattices, activator ions, sensitizers and defects cooperate to convert absorbed energy into ultraviolet, visible or near-infrared emission. The synthesis route is therefore not merely preparative: it governs phase formation, crystallinity, particle size, morphology, dopant distribution, oxidation state, surface chemistry and defect populations, all of which can alter radiative and non-radiative relaxation. This review critically examines conventional solid-state and flux-assisted reactions, sol–gel and Pechini processing, co-precipitation, hydrothermal/solvothermal synthesis, solution combustion, microwave-assisted synthesis, mechanochemistry, spray pyrolysis, thermal decomposition, electrospinning and vapor-phase deposition. For each route, the governing principles, key process variables, advantages, limitations, scalability and influence on luminescence are discussed. Particular attention is given to activator concentration, defect engineering, reaction atmosphere, post-annealing and sustainability. Recent literature shows a movement toward lower-temperature, faster, solvent-minimized and morphology-controlled processing, while computational and data-driven approaches are beginning to accelerate host/activator discovery and process optimization. A comparative framework is proposed to help researchers select a synthesis route according to application requirements rather than treating any single method as universally superior.