Performance improvement by alumina coatings on Y3Al5O12
| Autor: | Hubertus T. Hintzen, Zhi Zhou, David Valdesueiro, Melvin ten Kate, J. Ruud van Ommen, Xiangyang Lu, Nan Zhou |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
General Chemical Engineering Thermal resistance Analytical chemistry Phosphor 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Atomic layer deposition Chemical engineering Coating Transmission electron microscopy Fluidized bed engineering Thermal stability 0210 nano-technology Luminescence |
| Zdroj: | RSC Advances, 6(80) |
| ISSN: | 2046-2069 |
| Popis: | To improve the thermal stability, Al2O3 has been successfully coated on a Y3Al5O12:Ce3+ (YAG:Ce) phosphor powder host by using the Atomic Layer Deposition (ALD) approach in a fluidized bed reactor. Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray spectroscopy (EDX) analysis indicate that coating an Al2O3 thin layer by ALD is highly feasible. The luminescence properties (such as excitation and emission as well as quantum efficiency and UV-absorption of the coated YAG:Ce phosphor) were systematically analysed, with the further examination of the thermal resistance characteristics. The Al2O3 thin layer coating with precisely controlled thickness by ALD can obviously improve the luminescence intensity and greatly enhances the thermal stability of the YAG:Ce phosphor. It is suggested that the alumina coating with tailoring thickness seems not only to act like a barrier to decrease the thermal quenching, but also as a great help to promote the light absorption and transfer. |
| Databáze: | OpenAIRE |
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