Obtaining high efficiency at low power using a quantum-dotmicrocavity light-emitting diode

摘要

Efficiencies are calculated for quantum-dot apertured-microcavitynlight-emitting diodes. Although the maximum efficiency depends stronglynon the quantum-dot inhomogeneous broadening, greater than 20% efficiencynis calculated for a small-sized apertured microcavity, even for anninhomogeneous linewidth as large as 30 meV. The efficiency can benincreased to 40% if the inhomogeneous linewidth is reduced to 10 meV andnto more than 60% if the inhomogeneous linewidth is eliminated to leave anhomogeneous linewidth of 6.6 meV. The maximum output powers are ~40 nW,nalthough a microarray can increase this value. For the case of a singlenquantum dot, an efficiency >80% is estimated for a submicronnapertured-microcavity, with a maximum output power of ~3 nW