Synthesis of fluorescent core-shell nanomaterials and strategies to generate white light
- Department of Nanotechnology, Sri Guru Granth Sahib World University, Fatehgarh Sahib (India)
- School of Physics and Materials Science, Thapar University, Patiala 147004 (India)
- State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, 710049 Xi'an (China)
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.
- OSTI ID:
- 22494652
- Journal Information:
- Journal of Applied Physics, Vol. 118, Issue 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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