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Author Singh, Amandeep ♦ Kaur, Ramanjot ♦ Pandey, O. P. ♦ Wei, Xueyong ♦ Sharma, Manoj
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ 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
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.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-07-28
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 118
Issue Number 4


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