The scientific advancements of the past two decades have propelled lighting technology to unprecedented heights, with light-emitting diodes (LEDs) and organic light-emitting diodes (OLEDs) emerging as key players in these significant developments. The market for these technologies is poised to continue its upward trajectory in the coming decades, driven by a looming energy crisis and the increasingly urgent need to address climate change. Central to the appeal of LEDs and OLEDs is their remarkable current efficiency, enabling the production of brighter devices with reduced power consumption. Within the realm of solid-state lighting, light-emitting electrochemical cells (LECs) have emerged as a novel class of light-emitting devices, operating on the same principles of semiconductors but with a distinct working mechanism. LECs exhibit the unique characteristic of simultaneous electronic and ionic charge carriers within the active layer when a bias is applied. This feature facilitates charge injection as ionic species migrate toward electrodes of opposite polarity under the influence of an electric field. Consequently, LECs are liberated from the constraints of traditional charge transport layers and low work function electrodes, positioning them as a promising and cost-effective alternative to conventional lighting sources. This study presents several innovations in LEC devices and their fabrication process. These include the integration of a novel ionic transporting polymer and new device architectures as well as the utilization of new techniques previously unexplored in the field of LECs. Through these advancements, this research aims to further enhance the performance and applicability of LEC technology, paving the way for its wider adoption in future lighting applications.