A layered structure suitable as a support for an organic light emitting device (OLED), includes a light-transmissive glass substrate, a diffusive internal extraction layer (IEL) with an outer layer made of a glass containing at least 30 weight % of Bi2O3, formed on one side of the light-transmissive glass substrate, and an acid-resistant barrier layer formed on the IEL. The acid-resistant barrier layer has a bilayer structure made of an ALD-deposited metal oxide layer, the metal oxide being selected from the group consisting of aluminum oxide (Al2O3), titanium oxide (TiO2), zirconium oxide (ZrO2) and hafnium oxide (HfO2), in contact with the IEL, and a sputter-deposited SiOxNy layer in contact with the ALD-deposited metal oxide layer.