Color temperature tunable of Dy3+-doped LaPO4 nanorods prepared via hydrothermal method for white LEDs applications
| Autor: | M. Ferhi, Mokhtar Férid, Karima Horchani-Naifer, K. Hamraoui |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Photoluminescence
Materials science Analytical chemistry Phosphor 02 engineering and technology Color temperature 010402 general chemistry 01 natural sciences law.invention Inorganic Chemistry symbols.namesake law Emission spectrum Electrical and Electronic Engineering Physical and Theoretical Chemistry Chromaticity Spectroscopy Organic Chemistry 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials symbols 0210 nano-technology Luminescence Raman spectroscopy Light-emitting diode |
| Zdroj: | Optical Materials. 84:852-863 |
| ISSN: | 0925-3467 |
| Popis: | Nano-powders of La(1-x)DyxPO4 with rod-like morphology have been synthesized via hydrothermal method and characterized by X-ray diffraction, TEM, FTIR and Raman spectroscopy. The X-ray diffraction patterns collected for the prepared materials indicated the high purity of crystalline phase with a monoclinic structure. Photoluminescence properties have been investigated based on excitation and emission spectra, decay curves and chromatic coordinates. The emission spectra show a broad blue band ascribed to the transitions from the excited levels 4I11/2, 4I13/2, 4I15/2 and 4F9/2 to the fundamental levels 6H15/2. A yellow band related to the 4F9/2―›6H13/2 transition has been observed at 573 nm. The luminescence intensities ratio and lifetimes have been found to be dependent on the concentration of Dy3+ ion and the excitation wavelength. The decay curves present double exponential shape for all concentration of Dy3+. The yellow-to-blue emission intensity ratios and CIE chromaticity coordinates have been used to estimate the color of the emitted light. A high-quality of white light with three-color temperature (Warm, Natural or Daylight, Cool) has been obtained from a single emitting phosphor, LaPO4:Dy3+. The improved emission lifetimes and color temperature are suitable for application in the white light LED devices. |
| Databáze: | OpenAIRE |
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