Performance improvement by alumina coatings on Y₃Al₅O₁₂

Performance improvement by alumina coatings on Y₃Al₅O₁₂: Ce³⁺ phosphor powder deposited using atomic layer deposition in a fluidized bed reactor

Zhou, Z. (Hunan Agricultural University)
Zhou, Nan (Hunan Agricultural University)
Lu, Xiangyang (Hunan Agricultural University)
ten Kate, O.M. (TU Delft ChemE/Product and Process Engineering)
Valdesueiro Gonzalez, D. (TU Delft ChemE/Product and Process Engineering)
van Ommen, J.R. (TU Delft ChemE/Product and Process Engineering)
Hintzen, H.T.J.M. (TU Delft RST/Fundamental Aspects of Materials and Energy)

2016

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.

http://resolver.tudelft.nl/uuid:8475edaf-5adf-4d88-948b-e7bf6d4aa365

https://doi.org/10.1039/c6ra12983h

2017-08-08

2046-2069

RSC Advances, 6 (80), 76454-76462

Accepted Author Manuscript

Institutional Repository

journal article

© 2016 Z. Zhou, Nan Zhou, Xiangyang Lu, O.M. ten Kate, D. Valdesueiro Gonzalez, J.R. van Ommen, H.T.J.M. Hintzen