Fabrication and performance assessment of coprecipitation-based YAG:Ce nanopowders for white LEDs
| Autor: | Su-Hsen Wu, Ya-Wei Lee |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Fabrication Coprecipitation Analytical chemistry Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Crystallinity law Phase (matter) Calcination Electrical and Electronic Engineering 0210 nano-technology Luminescence Light-emitting diode |
| Zdroj: | Microelectronic Engineering. 199:24-30 |
| ISSN: | 0167-9317 |
| DOI: | 10.1016/j.mee.2018.07.011 |
| Popis: | The quality of YAG:Ce phosphors will influence the luminescent performance of white LEDs devices. Therefore, in this study, we attempted to synthesis high quality YAG:Ce phosphors using coprecipitation method. YAG:Ce precursors were synthesized through coprecipitation at different rotational speeds of an electromagnetic stirrer and then heated at different calcination temperatures ranging from 900 to 1300 °C. X-ray diffraction analysis revealed that phase-pure phosphors could be obtained from the precursors synthesized at 400 rpm and then calcined at 1300 °C. The emission intensity of Ce-doped YAG phosphor increased with the calcination temperature, owing to the higher crystallinity of the YAG phase. Moreover, at the same calcination temperature from 900 to 1300 °C, the maximum fluorescence intensity at approximately 540 nm of the YAG:Ce nanopowders synthesized at 400 rpm increased three to five times that of the YAG:Ce nanopowders synthesized at 200 rpm. The optimal luminescence performance of the YAG:Ce nanopowders was obtained at 400 rpm and at a calcination temperature of 1300 °C. The results of luminescence performance indicated YAG:Ce nanopowders has a great potential for development of white LEDs devices. |
| Databáze: | OpenAIRE |
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