Highly Stable Red-Emitting Sr2Si5N8:Eu2+ Phosphor with a Hydrophobic Surface

Bi Zhang; Jun Wei Wang; Lu Yuan Hao; Xin Xu; Simeon Agathopoulos; Liang Jun Yin; Cheng Ming Wang; Hubertus T.Bert Hintzen

doi:10.1111/jace.14560

Highly Stable Red-Emitting Sr₂Si₅N_8:Eu²⁺ Phosphor with a Hydrophobic Surface

Bi Zhang, Jun Wei Wang, Lu Yuan Hao, Xin Xu^*, Simeon Agathopoulos, Liang Jun Yin, Cheng Ming Wang, Hubertus T.Bert Hintzen

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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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.

Original language	English
Pages (from-to)	257-264
Number of pages	8
Journal	Journal of the American Ceramic Society
Volume	100
Issue number	1
DOIs	https://doi.org/10.1111/jace.14560
Publication status	Published - 1 Jan 2017

Keywords

coatings
heat treatment
hydrolysis
nitrides
optical materials/properties

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title = "Highly Stable Red-Emitting Sr2Si5N8:Eu2+ Phosphor with a Hydrophobic Surface",

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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AU - Zhang, Bi

AU - Wang, Jun Wei

AU - Hao, Lu Yuan

AU - Xu, Xin

AU - Agathopoulos, Simeon

AU - Yin, Liang Jun

AU - Wang, Cheng Ming

AU - Hintzen, Hubertus T.Bert

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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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KW - heat treatment

KW - hydrolysis

KW - nitrides

KW - optical materials/properties

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Highly Stable Red-Emitting Sr₂Si₅N_8:Eu²⁺ Phosphor with a Hydrophobic Surface

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Keywords

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