Excitonic improvement of colloidal nanocrystals in salt powder matrix for quality lighting and color enrichment

Optics Express
Talha ErdemHilmi Volkan Demir

Abstract

Here we report excitonic improvement in color-converting colloidal nanocrystal powders enabled by co-integrating nonpolar green- and red-emitting nanocrystal energy transfer pairs into a single LiCl salt matrix. This leads to nonradiative energy transfer (NRET) between the co-integrated nanocrystals in the host matrix. Here we systematically studied the resulting NRET process by varying donor and acceptor concentrations in the powders. We observed that NRET is a strong function of both of the nanocrystal concentrations and that NRET efficiency increases with increasing acceptor concentration. Nevertheless, with increasing donor concentration in the powders, NRET efficiency was found to first increase (up to a maximum level of 53.9%) but then to decrease. As a device demonstrator, we employed these NRET-improved nanocrystal powders as color-converters on blue light-emitting diodes (LEDs), with the resulting hybrid LED exhibiting a luminous efficiency >70 lm/W(elect). The proposed excitonic nanocrystal powders potentially hold great promise for quality lighting and color enrichment applications.

References

Dec 1, 2006·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·R Koeppe, N S Sariciftci
Jun 23, 2009·Science·Vlad SukhovatkinEdward H Sargent
Jun 3, 2010·Advanced Materials·Eunjoo JangYounghwan Kim
Apr 20, 2012·Optics Express·Ping ZhongMinhao Zhang
Aug 5, 2015·Nanoscale·Talha ErdemHilmi Volkan Demir
Aug 12, 2015·The Journal of Physical Chemistry Letters·Zeliha Soran-ErdemHilmi Volkan Demir

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Citations

Oct 1, 2016·The Journal of Physical Chemistry Letters·Marcus AdamHilmi Volkan Demir
Feb 3, 2016·Optics Express·Sergey GaponenkoUlrike Woggon

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