Study on the stability of phosphor SrAl2O4:Eu2+, Dy3+ in water and method to improve its moisture resistance

Chongfeng Guo; Lin Luan; Dexiu Huang; Qiang Su; Yuhua Lv

doi:10.1016/j.matchemphys.2007.05.052

Study on the stability of phosphor SrAl2O4:Eu2+, Dy3+ in water and method to improve its moisture resistance

Chongfeng Guo^*, Lin Luan, Dexiu Huang, Qiang Su, Yuhua Lv

^*Corresponding author for this work

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

72 Citations (Scopus)

Abstract

Phosphor SrAl₂O₄:Eu²⁺, Dy³⁺ with persistent green luminescence is chemically unstable to water or moisture. Its hydrolysis process was detailed studied through a series of experiments, and the products of hydrolysis were also analyzed intensively. Changes of pH value of suspensions, the structures and optical properties of the hydrolysis products had been studied. A layer of moisture barrier was also applied to the phosphor particles by heating phosphor particles and ammonium difluoride (NH₄HF₂) at an elevated temperature, which formed alkaline earth fluoride moisture-resistance coating on phosphor surfaces. Scanning electron microscopy and X-ray diffraction patterns were employed to characterize the coatings. Changes of photoluminescence intensity and the pH values of phosphor solution were measured to characterize the stability of phosphor. All results indicated that alkaline earth fluorides were effective moisture-imperious coating for strontium aluminates phosphors.

Original language	English
Pages (from-to)	268-272
Number of pages	5
Journal	Materials Chemistry and Physics
Volume	106
Issue number	2-3
DOIs	https://doi.org/10.1016/j.matchemphys.2007.05.052
Publication status	Published - 25 Dec 2007

Keywords

Hydrolysis
Luminescence
Phosphors and coatings
Structure
Surfaces

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10.1016/j.matchemphys.2007.05.052

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title = "Study on the stability of phosphor SrAl2O4:Eu2+, Dy3+ in water and method to improve its moisture resistance",

abstract = "Phosphor SrAl2O4:Eu2+, Dy3+ with persistent green luminescence is chemically unstable to water or moisture. Its hydrolysis process was detailed studied through a series of experiments, and the products of hydrolysis were also analyzed intensively. Changes of pH value of suspensions, the structures and optical properties of the hydrolysis products had been studied. A layer of moisture barrier was also applied to the phosphor particles by heating phosphor particles and ammonium difluoride (NH4HF2) at an elevated temperature, which formed alkaline earth fluoride moisture-resistance coating on phosphor surfaces. Scanning electron microscopy and X-ray diffraction patterns were employed to characterize the coatings. Changes of photoluminescence intensity and the pH values of phosphor solution were measured to characterize the stability of phosphor. All results indicated that alkaline earth fluorides were effective moisture-imperious coating for strontium aluminates phosphors.",

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author = "Chongfeng Guo and Lin Luan and Dexiu Huang and Qiang Su and Yuhua Lv",

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AU - Guo, Chongfeng

AU - Luan, Lin

AU - Huang, Dexiu

AU - Su, Qiang

AU - Lv, Yuhua

PY - 2007/12/25

Y1 - 2007/12/25

N2 - Phosphor SrAl2O4:Eu2+, Dy3+ with persistent green luminescence is chemically unstable to water or moisture. Its hydrolysis process was detailed studied through a series of experiments, and the products of hydrolysis were also analyzed intensively. Changes of pH value of suspensions, the structures and optical properties of the hydrolysis products had been studied. A layer of moisture barrier was also applied to the phosphor particles by heating phosphor particles and ammonium difluoride (NH4HF2) at an elevated temperature, which formed alkaline earth fluoride moisture-resistance coating on phosphor surfaces. Scanning electron microscopy and X-ray diffraction patterns were employed to characterize the coatings. Changes of photoluminescence intensity and the pH values of phosphor solution were measured to characterize the stability of phosphor. All results indicated that alkaline earth fluorides were effective moisture-imperious coating for strontium aluminates phosphors.

AB - Phosphor SrAl2O4:Eu2+, Dy3+ with persistent green luminescence is chemically unstable to water or moisture. Its hydrolysis process was detailed studied through a series of experiments, and the products of hydrolysis were also analyzed intensively. Changes of pH value of suspensions, the structures and optical properties of the hydrolysis products had been studied. A layer of moisture barrier was also applied to the phosphor particles by heating phosphor particles and ammonium difluoride (NH4HF2) at an elevated temperature, which formed alkaline earth fluoride moisture-resistance coating on phosphor surfaces. Scanning electron microscopy and X-ray diffraction patterns were employed to characterize the coatings. Changes of photoluminescence intensity and the pH values of phosphor solution were measured to characterize the stability of phosphor. All results indicated that alkaline earth fluorides were effective moisture-imperious coating for strontium aluminates phosphors.

KW - Hydrolysis

KW - Luminescence

KW - Phosphors and coatings

KW - Structure

KW - Surfaces

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DO - 10.1016/j.matchemphys.2007.05.052

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VL - 106

SP - 268

EP - 272

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

SN - 0254-0584

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ER -

Study on the stability of phosphor SrAl2O4:Eu2+, Dy3+ in water and method to improve its moisture resistance

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