Forster resonance energy transfer enhanced color-conversion using colloidal semiconductor quantum dots for solid state lighting

In this paper, we present Forster resonance energy transfer (FRET)-enhanced color-conversion using colloidal semiconductor quantum dot nanocrystals (NCs) to make reddish-orange light-emitting diodes for use in ultraefficient solid state lighting. To achieve FRET enhancement at 614 nm, we use an energy gradient hybrid structure made of cyan-and orange-emitting CdSe/ZnS NCs (lambda(PL) = 492 and 588 nm in solution, respectively). This enables recycling of trapped excitons using FRET and achieves a relative quantum efficiency enhancement of 15.1% in reddish-orange full color-conversion for the integrated hybrid cyan-orange NC layer with respect to the case of full color-conversion using only orange NCs without FRET. (C) 2009 American Institute of Physics. [doi:10.1063/1.3222902]