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

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.
Authors:
;  [1] ;  [2] ;  [3] ;  [1] ;  [4]
  1. Department of Nanotechnology, Sri Guru Granth Sahib World University, Fatehgarh Sahib (India)
  2. School of Physics and Materials Science, Thapar University, Patiala 147004 (India)
  3. State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, 710049 Xi'an (China)
  4. (Turkey)
Publication Date:
OSTI Identifier:
22494652
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CADMIUM; COLOR; CONCENTRATION RATIO; COPPER; DOPED MATERIALS; FLUORESCENCE; MANGANESE; NANOMATERIALS; NANOPARTICLES; QUANTUM DOTS; SELF-ABSORPTION; SOLIDS; SURFACES; VISIBLE RADIATION; VISIBLE SPECTRA; ZINC SULFIDES