Effect of sintering atmosphere and lithium ion co-doping on photoluminescence properties of NaCaPO :Eu2+ phosphor
| Autor: | Jung Hyun Jeong, Ho-Sueb Lee, Soung Soo Yi, Kiwan Jang, Dong-Soo Shin, Vengala Rao Bandi, Bhaskar Kumar Grandhe |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Photoluminescence Infrared Process Chemistry and Technology Doping Analytical chemistry chemistry.chemical_element Phosphor Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake chemistry Differential thermal analysis Materials Chemistry Ceramics and Composites symbols Lithium Fourier transform infrared spectroscopy Raman spectroscopy |
| Zdroj: | Ceramics International. 38:6273-6279 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2012.04.082 |
| Popis: | This paper reports on the photoluminescence properties of Na 1− y Li y Ca 1− x PO 4 : x Eu 2+ phosphors synthesized by a solid state reaction method. The prepared phosphors have been thoroughly characterized by means of X-ray diffraction (XRD), Field-emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectrum (FTIR), Raman spectrum, Thermo gravimetric and differential thermal analysis (TG–DTA) and photoluminescent spectral measurements. The structure of Na 1− y Li y Ca 1− x PO 4: x Eu 2+ phosphors were found to be orthorhombic in nature with a sphere-like morphology and having the particle size in micrometer range. The excitation spectra of NaCaPO 4 :Eu 2+ phosphors revealed a broad excitation band having its maximum intensity at 373 nm and ranging from 250 m to 450 nm. Incidentally, it matches well with the ultraviolet (UV) radiation of light-emitting diodes (LEDs). Upon 373 nm excitation, these phosphors exhibited intense bluish-green emission band centered at 505 nm. The effect of sintering atmospheres and co-doping of lithium ions on the photoluminescence properties of the NaCaPO 4 :Eu 2+ phosphors were studied and explained suitably. The obtained results indicate that the prepared NaCaPO 4 :Eu 2+ phosphors are promising bluish-green candidates for the phosphor-converted white LED applications. |
| Databáze: | OpenAIRE |
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