Composition comprising inorganic particles dispersed in a transparent material

A composition C1 comprising:

• a) a transparent material M1;
• and
• b) inorganic particles P1 comprising an inorganic compound of the formula ABxC1-xX3,
• wherein x is from 0 to 1 and A, B, and C are cations and X is an anion;
• or of the formula A′1-yA″yCX3,
• wherein y is from 0 to 1 and A′, A″, and C are cations and X is an anion;
• or of the formula A′1-yA″yBxC1-xX3,
• wherein x is from 0 to 1, y is from 0 to 1 and A′, A″, B, and C are cations and X is an anion,
• the particles P1 having a weight average particle diameter of between 1 nm and 1 μm and representing at least 1000 ppm of the composition C1 comprising the components a) and b), and
• wherein the transparent material M1 comprises a copolymer comprising from 60% to 99.9% by weight of methyl methacrylate and from 0.1% to 40% by weight of at least one monomer chosen from methacrylic acid, methyl acrylate, ethyl acrylate or mixtures thereof.