Cool white light emitting Ba5Zn4Y8O21:Dy3+ nanophosphors for single-phased WLEDs
| Autor: | Manju Dahiya, Dinesh Kumar, Anju Siwach, Mandeep Dalal, Heena Dahiya |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Photoluminescence Rietveld refinement Analytical chemistry chemistry.chemical_element Phosphor 02 engineering and technology Color temperature 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Tetragonal crystal system chemistry 0103 physical sciences Dysprosium Electrical and Electronic Engineering Chromaticity 0210 nano-technology Luminescence |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 29:20750-20758 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-018-0216-5 |
| Popis: | A series of cool white light emitting, trivalent dysprosium activated, Ba5Zn4Y8O21 nanocrystals was prepared via a urea aided solution-combustion method. Powder X-ray diffraction analysis, coupled with Rietveld refinement technique, was used to confirm the phase purity and to obtain other structural parameters. The outcomes conclude that all the synthesized powders have a single-phased tetragonal matrix with I4/m (87) space group symmetry. The semi-spherical crystallites were found to exhibit the size domain ranging from 45 to 55 nm. The photoluminescence emission of the synthesized nanophosphors exhibits two characteristics peaks i.e. blue (489 nm) and yellow (578 nm) emissions under excitation of 353 nm; assigned to 4F9/2 → 6HJ (J = 15/2, 13/2) transitions of dysprosium ions, respectively. The calculated CIE chromaticity coordinates for optimum luminescent composition (x = 0.3378, y = 0.3297) were found to be very close to the standard white emission recommended by National Television Standard Committee. The values of CIE chromaticity coordinates and correlated color temperature (5250 K) recommend the cool white-light emission from the phosphor. This study discovers that Dy3+ doped Ba5Zn4Y8O21 phosphor may be a credible candidate for near ultra-violet excited white-LED applications with cool light components. |
| Databáze: | OpenAIRE |
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