The electroluminescence of solids is the realm of semiconductors and related organic materials. In 2019, we discovered that a graphene transistor encapsulated in hexagonal Boron Nitride and submitted to a large bias becomes electroluminescent in the mid-infrared. This device operates in the open air and might be a breakthrough technology in the domain of mid-infrared source. Indeed, compact and cheap sources are inefficient and slow in this optical domain which is of considerable interest for free space telecommunication and pollutant detection. The triple challenge taken by the ELuSeM consortium is to strengthen the understanding of basic mechanisms leading to HPhP electroluminescence, optimize geometry and harness far-field coupling with nano-antennas to extract a significant fraction (few %) of the electrical power budget, investigate new low-cost routes for large scale hBN production.