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Investigation of lanthanumâsensitized CaZrO 3 blue nanophosphors for white lightâemitting diode applications
- Source :
- Luminescence. 36:481-488
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- In the present study, CaZrO3 nanophosphors were sensitized with lanthanum (La) at different concentrations (0.5, 1.0, 1.5, 2.0, and 2.5) prepared using polyvinyl alcohol as the chelating agent through the sol-gel method. To study their structural and optical properties, samples were characterized by X-ray diffractometry (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and photoluminescence (PL). The XRD results revealed that samples were well crystallized and average crystallite sizes were calculated. The average crystallite size value was in good agreement with the value obtained from TEM analysis. Energy dispersive spectroscopy and FE-SEM confirmed the existence of La in the prepared samples. In the PL spectra, La-sensitized samples exhibited three bands at 402 nm, 438 nm, and 463 nm in the visible range when excited at the 260 nm wavelength. As the proportion of La increased, the intensity of bands at 438 nm and 463 nm decreased, whereas the band at 402 nm remained stable. Time-resolved PL spectra illustrated the lifetime of the samples. Corresponding CIE co-ordinates for La-sensitized CaZrO3 were calculated.
- Subjects :
- Materials science
Photoluminescence
010401 analytical chemistry
Biophysics
Energy-dispersive X-ray spectroscopy
Analytical chemistry
chemistry.chemical_element
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Wavelength
chemistry
Chemistry (miscellaneous)
Transmission electron microscopy
Excited state
Lanthanum
Crystallite
0210 nano-technology
Sol-gel
Subjects
Details
- ISSN :
- 15227243 and 15227235
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- Luminescence
- Accession number :
- edsair.doi...........4aa120ec840c203acf83b6beeb8b7530