The invention relates to coated particles comprising ABX3-type and/or AB2X4-type perovskite crystals, where A is at least one monovalent, bivalent or trivalent element from the fourth or a higher period in the periodic table and/or mixtures thereof; B is a monovalent cation, the volumetric parameter of which is sufficient for element A to form perovskite lattices; and X is selected from among halides and pseudo-halides. The invention also relates to a method for manufacturing said coated particles and the use thereof in layers and detectors such as X-ray detectors, gamma-ray detectors and UV detectors, or solar cells.