Synthesis of fluorescent core-shell nanomaterials and strategies to generate white light
Author
Singh, A.
Kaur, R.
Pandey, O. P.
Wei, X.
Sharma, M.
Date
2015Source Title
Journal of Applied Physics
Print ISSN
218979
Publisher
American Institute of Physics Inc.
Volume
118
Issue
4
Pages
044305-1 - 044305-9
Language
English
Type
ArticleItem Usage Stats
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Abstract
In this work, cadmium free core-shell ZnS:X/ZnS (X-=-Mn, Cu) nanoparticles have been synthesized and used for white light generation. First, the doping concentration of Manganese (Mn) was varied from 1% to 4% to optimize the dopant related emission and its optimal value was found to be 1%. Then, ZnS shell was grown over ZnS:Mn(1%) core to passivate the surface defects. Similarly, the optimal concentration of Copper (Cu) was found to be 0.8% in the range varied from 0.6% to 1.2%. In order to obtain an emission in the whole visible spectrum, dual doping of Mn and Cu was done in the core and the shell, respectively. A solid-solid mixing in different ratios of separately doped quantum dots (QDs) emitting in the blue green and the orange region was performed. Results show that the optimum mixture of QDs excited at 300-nm gives Commission Internationale del'Éclairage color coordinates of (0.35, 0.36), high color rendering index of 88, and correlated color temperature of 4704-K with minimum self-absorption. © 2015 AIP Publishing LLC.
Keywords
ColorDoping (additives)
Semiconductor quantum dots
Shells (structures)
Surface defects
Synthesis (chemical)
Zinc sulfide
Correlated color temperature
Doped quantum dots
Doping concentration
Fluorescent cores
High color rendering index
Optimal concentration
Solid-solid mixing
White-light generation
Manganese