| 摘要 |
A coated substrate for use in a glazing panel or optical filter to impart solar screening properties thereto while avoiding an aesthetically unattractive purplecolour in reflection is provided by the presence on the substrate of a stack of coating layers comprising (i) a layer of dielectric material, (ii) a layer of a metal selected from silver, gold, copper and alloys of one or more thereof, and (iii) a further layer of dielectric material, characterised in that the layer (i) of dielectric material is a composite layer which includes a sub-layer of a selectively absorbent material with a refractive index of at least 1.4, a spectral absorption index k.lambda. of at least 0.4 in the range 380<.lambda.<450 nm and presenting a ratio k380<.lambda.<450 nm/k650<.lambda.<760 nm > 2. |
