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(a) Schematic representation of the types of QD-LED structures under study; (b) the energy band diagram of the QD-LED device type 2.
Shown for the type-1 devices is: (a) J–V characteristic (open squares) and its linear fit (gray line). (b) EL intensity kinetics under forward (black squares) and reverse (red circles) current density of J = 0.2 A/cm2 for both cases.
Shown for the type-1 devices is: (a) EL-peak intensity (red line) and EL power efficiency (black line) vs current density in a log-log plot. (b) Normalized EL spectra shown for selected J values together with a photoluminescence spectrum observed on the as-fabricated sample.
Integrated EL intensity of QD-LED with graphene (type 2; triangles) and ITO based (type 3; circles) anode junctions as a function of current density for the (a) complete current density range, and (b) a detailed scan for current densities J < 0.35 A/cm2.
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