Electrogenerated Chemiluminescence and Electroluminescence of N‐Doped Graphene Quantum Dots Fabricated from an Electrochemical Exfoliation Process in Nitrogen‐Containing Electrolytes

Abstract Artificial lighting sources are one of the most important technological developments for our modern lives; the search for cost‐effective and efficient luminophores is therefore crucial to a sustainable future. Graphene quantum dots (GQDs) are carbon‐based nanomaterials that exhibit exceptional optical and electronic properties, making them a prime candidate for a luminophore in a light‐emitting device. Nitrogen‐doped GQDs fabricated from a facile top‐down electrochemical exfoliation process with a nitrogen‐containing electrolyte in this report showed strong photoluminescent emission at 450 nm, and electrogenerated chemiluminescence at 660 nm in the presence of benzoyl peroxide as a coreactant. When introduced into solid‐state light‐emitting electrochemical cells, for the first time, the GQDs displayed a broad white emission centered at 610 nm, corresponding to Commision Internationale de l'eclairage (CIE) colour coordinates of (0.38, 0.36).