Performance improvement by alumina coatings on Y3Al5O12

Ce3+ phosphor powder deposited using atomic layer deposition in a fluidized bed reactor

Journal article (2016)

Authors

Z. Zhou Hunan Agricultural University
Nan Zhou Hunan Agricultural University
Xiangyang Lu Hunan Agricultural University
O.M. ten Kate ChemE/Product and Process Engineering - AS
D. Valdesueiro Gonzalez ChemE/Product and Process Engineering - AS
J.R. van Ommen ChemE/Product and Process Engineering - AS
H.T.J.M. Hintzen RST/Fundamental Aspects of Materials and Energy - AS
Research Group
ChemE/Product and Process Engineering (AS) (TU Delft)
Copyright: © 2016 Z. Zhou, Nan Zhou, Xiangyang Lu, O.M. ten Kate, D. Valdesueiro Gonzalez, J.R. van Ommen, H.T.J.M. Hintzen
DOI: https://doi.org/10.1039/c6ra12983h
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Published Date

2016

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Product and Process Engineering

Abstract

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.

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