NOVELTY - The transparent substrate (1) comprises a support (10) and an electrode (11) comprising a stack with a single conductive metal layer and a coating (110) having properties for improving the light transmission of light through the electrode. The coating has a geometrical thickness of 50-130 nm, and comprises a layer (1101) for improving light transmission between the conductive metal layer and the support on which the electrode is deposited. The refractive index of the coating of the improvement of light transmission is greater than the refractive index of the support.    USE - The transparent substrate is useful for photonic devices, and in an organic electroluminescent device (OLED) emitting white light (claimed) and organic photovoltaic cells such as solar cells.    ADVANTAGE - The transparent substrate effectively improves the quantity of white light emitted or converted through the photonic device or OLED using a stack of layers, and can be easily fabricated with good conductivity and anti-reflection property.    DETAILED DESCRIPTION - The transparent substrate (1) comprises a support (10) and an electrode (11) comprising a stack with a single conductive metal layer and a coating (110) having properties for improving the light transmission of light through the electrode. The coating has a geometrical thickness of 50-130 nm, and comprises a layer (1101) for improving light transmission between the conductive metal layer and the support on which the electrode is deposited. The refractive index of the coating of the improvement of light transmission is greater than the refractive index of the support. The geometrical thickness of the conductive metal layer is 6-22 nm. The optical thickness of the coating having properties for improving the light transmission (T(D1)) and the geometrical thickness of the conductive metal layer (T(ME)) are related by a relation T(ME)=T(ME0)+Basterisksin( pi asteriskT(D1)/T((D1)0))/n3support, where T(ME0), B and T(D1)0 are constants with T(ME0) having a value of 10-25 nm, B has a value of 10-16.5 and T(D1)0 has a value of 23.9asteriskn(D1) nm to 28.3asteriskn(D1) nm, where n(D1) has the refractive index of the coating to improve light transmission at a wavelength of 550 nm and nsupport has a refraction index value of 1.5 at a wavelength of 550 nm. The electrode comprises a coating for improvement of light transmission comprising an additional layer for crystallization, a standardizing thin layer having surface electrical properties located at the top of the multilayer stack forming the electrode with respect to the support, and insertion additional layer located between the conductive metal layer and the standardizing thin layer. The crystallization layer is the layer farthest from the stack constituting the coating with respect to the support. The geometrical thickness of the crystallizing layer is 7% of the total geometrical thickness of the coating to improve the transmission of the light. The geometrical thickness of the insertion layer is such that its ohm thickness is at most equal to 1012 Ohm, where the Ohm thickness is equal to the ratio between the resistivity of the first material constituting the insertion layer and the geometrical thickness of the insertion layer. The first organic layer denotes the set of organic layers between the insertion layer and the electroluminescent organic layer, and is represented by a relation Eorg=Ein-A, where A is a constant having a value of 75-205 nm. The conductive metal layer further comprises a sacrificial layer on its faces. The support on which the electrode is deposited comprises a functional coating on the face opposite to the face on which the electrode is deposited, and is a reflection side support having a value of 49%. An INDEPENDENT CLAIM is included for a process for fabricating a transparent substrate.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of a transparent substrate.    Transparent substrate (1)    Support (10)    Electrode (11)    Coating (110)    Light transmission enhancement layer. (1101)