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      Synthesis of fluorescent core-shell nanomaterials and strategies to generate white light

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      Author
      Singh, A.
      Kaur, R.
      Pandey O.P.
      Wei X.
      Sharma, M.
      Date
      2015
      Journal Title
      Journal of Applied Physics
      ISSN
      218979
      Publisher
      American Institute of Physics Inc.
      Volume
      118
      Issue
      4
      Language
      English
      Type
      Article
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      Please cite this item using this persistent URL
      http://hdl.handle.net/11693/21436
      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.
      Published as
      http://dx.doi.org/10.1063/1.4927482
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