Method of manufacturing a diffusing reflector

1 . A method of manufacturing a diffusing reflector comprising coating a substrate with a suspension of metal nanoparticles and annealing the coated substrate at elevated temperature, characterized in that the suspension of metal nonoparticles comprises a silane derivative as additive with at least one methyl group and at least one alkoxy group.

2 . The method of manufacturing a diffusing reflector according to claim 1 wherein the annealing is performed at a temperature above 350° C.

3 . A diffusing reflector comprising an annealed substrate coated with a suspension of metal nanoparticles and an additive, characterized in that the additive comprises a silane derivative with at least one methyl group and at least one alkoxy group.

4 . The diffusing reflector of claim 3 wherein the silane derivative is methyl trialkoxysilane, the alkoxy moieties having 1 to 4 carbon atoms.

5 . The diffusing reflector of claim 4 wherein the silane derivative is methyl trimethoxysilane, methyl triethoxysilane, or a mixture thereof.

6 . The diffusing reflector of claim 3 wherein the suspension of the metal nanoparticles comprises <20 vol. % of the silane derivative.

7 . The diffusing reflector of claim 3 wherein the metal nanoparticles are selected from gold, silver, platinum, rhodium, iridium, palladium, chromium, copper, and aluminum, and mixtures thereof.

8 . The diffusing reflector of claim 3 wherein the metal nanoparticles are colloidal silver sol particles.

9 . A display apparatus comprising at least one substrate, an electro-optical layer, the diffusing reflector of claim 3 , and at least one electrode.