Excitonic Improvement Of Colloidal Nanocrystals In Salt Powder Matrix For Quality Lighting And Color Enrichment
| Autor: | Yusuf Kelestemur, Hilmi Volkan Demir, Talha Erdem, Nikolai Gaponik, Zeliha Soran-Erdem |
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| Přispěvatelé: | Demir, Hilmi Volkan |
| Rok vydání: | 2016 |
| Předmět: |
Nonradiative energy transfer
Materials science Energy transfer Color 02 engineering and technology Nanocrystal powders 01 natural sciences law.invention 010309 optics Colloid Optics law 0103 physical sciences Semiconducting gallium compounds Blue light emitting diodes Lighting Donor concentrations Diode business.industry Nanocrystalline powders 021001 nanoscience & nanotechnology Acceptor Light emitting diodes Atomic and Molecular Physics and Optics Nanocrystals Nanocrystal Chemical engineering Transmission electron microscopy Colloidal nanocrystals Device demonstrators Luminous efficiency Optoelectronics Acceptor concentrations Powders 0210 nano-technology business Luminous efficacy Light-emitting diode |
| Zdroj: | Optics Express |
| Popis: | 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 cointegrated 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/Welect. The proposed excitonic nanocrystal powders potentially hold great promise for quality lighting and color enrichment applications. (C) 2015 Optical Society of America |
| Databáze: | OpenAIRE |
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