Highly Stable Red-Emitting Sr<sub>2</sub>Si<sub>5</sub>N<sub>8:</sub>Eu<sup>2+</sup> Phosphor with a Hydrophobic Surface

Journal article (2017)

Authors

Bi Zhang University of Science and Technology of China
Jun Wei Wang University of Science and Technology of China
Lu Yuan Hao University of Science and Technology of China
Xin Xu University of Science and Technology of China
Simeon Agathopoulos University of Ioannina
L.J. Yin University of Electronic Science and Technology of China, ChemE/Product and Process Engineering - AS
Cheng Ming Wang University of Science and Technology of China
H.T.J.M. Hintzen RST/Fundamental Aspects of Materials and Energy - AS
Research Group
ChemE/Product and Process Engineering (AS) (TU Delft)
Coatings Heat treatment Hydrolysis Nitrides Optical materials/properties
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Published Date

01-01-2017

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Product and Process Engineering

Abstract

One of the biggest problems in white light-emitting diodes (WLEDs) is the moisture-induced degradation of phosphors. This paper proposes a simple and feasible surface modification method to solve it, whereby a hydrophobic surface layer is developed on the surface of the phosphors. The particular case of orange-red-emitting Sr2Si5N8:Eu2+ (SSN) phosphor was investigated. The mechanism to develop the hydrophobic layer involves hydrolysis and polymerization of tetraethylorthosilicate (TEOS) and polydimethylsiloxane (PDMS). The experimental results showed that the surface layer of SSN phosphor was successfully modified to a hydrophobic nanolayer (8 nm) of amorphous silicon dioxide that contains CH3 groups in the surface. This hydrophobic surface layer gives the modified phosphor superior stability in high-pressure water steam conditions at 150°C.

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