Quantum efficiency enhancement in nanocrystals using nonradiative energy transfer with optimized donor-acceptor ratio for hybrid LEDs
Author
Nizamoglu, S.
Akin, O.
Demir, Hilmi Volkan
Date
2009-06-17Source Title
Applied Physics Letters
Print ISSN
0003-6951
Publisher
American Institute of Physics
Volume
94
Issue
24
Pages
243107-1 - 243107-3
Language
English
Type
ArticleItem Usage Stats
151
views
views
114
downloads
downloads
Abstract
The quantum efficiency enhancement in nanocrystal solids is critically important for their efficient use as luminophors on color-conversion light emitting diodes (LEDs). For this purpose, we investigate energy gradient mixture of nanocrystal solids for recycling their trapped excitons by varying their donor-acceptor nanocrystal ratios and study the resulting quantum efficiency enhancement as a function of the donor-acceptor ratio in the solid film for hybrid LEDs. We achieve a maximum quantum efficiency enhancement of 17% in these nanocrystal solids when the donor-acceptor ratio is 1:1, demonstrating their highly modified time-resolved photoluminescence decays to reveal the kinetics of strong energy transfer between them.
Keywords
Cadmium compoundsExcitons
Ii-vi semiconductors
Light emitting diodes
Nanostructured materials
Phosphors
Photoluminescence
Time resolved spectra
Wide band gap semiconductors
Zinc compounds