Electroluminescence of Colloidal Quantum Dots in Electrical Contact with Metallic Nanoparticles

摘要

The electroluminescence of a carpet of colloidal quantum dots in electricalrncontact with a metal nanoparticle array is investigated. The properties of thernstructures spectacularly differ from the well-known behavior of point sourcesrnplaced at nonvanishing distances from subwavelength scatterers (robustnessrnto quenching, coupling primarily defined by the electrical contact between therntwo species, etc.). This regime of short-range interactions can even be enabledrnwith nonplasmonic inclusions made of platinum, providing an extremerncase of enhanced and tailored light emission by quantum emitters in a highlyrnabsorptive environment. As a corollary, surface plasmons are not a necessaryrnor sufficient ingredient but add functionalities that nonplasmonic structuresrndo not possess. These findings indicate that the physics of localizedrnlight emitters in highly inhomogeneous environments is far from being fullyrnunderstood and have important implications for the next generation of activernmetamaterials and advanced optoelectronic devices.