FIG. 12d shows a further exemplary light emitting system 1220. The light emitting system 1220 comprises a plurality of EL devices. The EL devices are arranged to spell CITYU. The light emitting system 1220 is illuminated when an electric current is applied to the system (i.e. an electric current is applied to all the EL devices). The EL devices may all be formed from a single large EL device that is cut into several smaller ones. The light emitting system can be easily formed by repairing and coupling multiple small EL devices formed by cutting a large EL device. Each of the smaller pieces also function as individual EL devices. The CITYU configuration is formed by coupling the smaller EL devices to each other, wherein each of the smaller EL devices are coupled by exploiting the self-repair ability of each EL device (the self-repair ability being described earlier). The light emitting system can be constructed into any suitable shape or configuration since EL devices can be cut into desired custom shapes and coupled together to form a light emitting system. The EL device structure as described herein is particularly advantageous because it allows customization of shapes and arrangements by exploiting the self-repair ability of the EL device. In one example the colour of each of the electroluminescent devices that forms the light emitting system can be changed by doping the electroluminescence layer of each of the electroluminescent devices. The doping can change the wavelength emission.