Emitting-tunable Eu(2+/3+)-doped Ca(8−x)La(2+x) (PO4)6−x(SiO4)xO2 apatite phosphor for n-UV WLEDs with high-color-rendering
| Autor: | Hui Jia, Hui Xiao, Ting-Shan Chan, Yi Wei, Jun Lin, Chun Che Lin, Meng Meng Shang, Chaochin Su, Guogang Li |
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| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
business.industry Chemistry Rietveld refinement General Chemical Engineering Doping Analytical chemistry Phosphor 02 engineering and technology General Chemistry Color temperature 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Color rendering index Optics Activator (phosphor) 0210 nano-technology business Solid solution |
| Zdroj: | RSC Advances. 7:1899-1904 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c6ra26869b |
| Popis: | Currently, developing single-phased white light phosphors based on a single-doped activator is an efficient approach to blends of bicolor/tricolor phosphors for realizing phosphor-converted white light emitting diodes (pc-WLEDs) with a high color rendering index (CRI) and low correlated color temperature (CCT). Here, we present high CRI (Ra = 93–95) and low CCT (3500–6000 K) white lights by cosubstituting [Ca2+–P5+] for [La3+–Si4+] in the solid solution Ca(8→2)La(2→8)(PO4)6−x(SiO4)xO2:Eu2+/Eu3+ (CLPSO_Eu). The results are attributed to the presence of multi Ca2+ sites due to possible mixing nanophases and the simultaneous occupancy of Ca2+ and La3+ sites by Eu, resulting in the mixing of blue (466 nm) and green emissions (540 nm) for Eu2+, and red emission (613 nm) for Eu3+, which were perfectly confirmed using X-ray Rietveld refinement, photoluminescence spectra and extended X-ray absorption fine structure. These findings not only imply that the as-prepared CLPSO_Eu are promising single-phased white light phosphor for near-UV based WLEDs but also offer a novel avenue to design high CRI white light phosphors based on a tunable Eu2+/Eu3+. |
| Databáze: | OpenAIRE |
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