White, phosphorescent, wet-processed, organic light-emitting diode, on a window-glass substrate

A substrate is presented as an alternative to indium tin oxide as the anode material for organic light-emitting diodes. We show that float glass, the material most commonly used in window glass, with a thin transparent evaporated gold layer, provides a cheap, and readily available alternative. Bright organic light-emitting diodes emitting in the white, and near white, are demonstrated, using a spin coated blend of phosphorescent iridium complexes doped into a suitable polymer host, as the emissive layer. The emission colour of these blends is shown to be tunable from the blue to the red, dependant on the relative concentrations of the two phosphorescent molecules.