Nanocrystal lasing in the single-exciton regime using engineered exciton-exciton interactions

Because of size-controlled emission color, good photostability, and chemical flexibility, colloidal semiconductor nanocrystals (NCs) are promising building blocks for new types of color-selectable optical gain media [1]. One factor limiting optical gain performance of NCs is highly efficient multiexciton Auger recombination that leads to short picosecond optical gain life times [2]. Recent attempts to suppress Auger recombination utilized NC shape control [3, 4].