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

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2 Author(s)
Nizamoglu, S. ; Department of Electrical and Electronics Engineering, Department of Physics, and Nanotechnology Research Center, Institute of Materials Science and Nanotechnology, Bilkent University, Ankara TR-06800, Turkey ; Demir, H.V.

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In this paper, we present Förster 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 (λPL=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.

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Applied Physics Letters  (Volume:95 ,  Issue: 15 )