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

Guo, Chongfeng; Liu, Lin; Huang, Daixin; Su, Qiang; Lv, Yuhua

doi:10.1016/j.matchemphys.2007.05.052

Cited by 73 publications

(29 citation statements)

References 11 publications

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“…After 48 hours, the original SrAl 2 O 4 phase is no longer detectable by XRD and the phosphor appears fully hydrated. The Sr 3 Al 2 (OH) 12 is clearly present along with a potentially hydrated form of alumina (

{Al}_{2} {normalO}_{3} \cdot {3H}_{2} O

), similar to prior reports . These degradation products (eg, Sr 3 Al 2 (OH) 12 and (

{Al}_{2} {normalO}_{3} \cdot {3H}_{2} O

) match those previously reported and summarized in the chemical reactions shown above.…”

Section: Resultssupporting

confidence: 88%

Atomic layer deposition (ALD) of nanoscale coatings on SrAl₂O₄‐based phosphor powders to prevent aqueous degradation

et al. 2020

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The aqueous degradation of Eu2+‐activated and Dy3+‐codoped strontium aluminate (SrAl2O4:Eu2+, Dy3+, SA2‐Green) long afterglow phosphors synthesized from solid‐state reaction and coated with nanoscale metal oxide protective layers (≤12 nm) via atomic layer deposition (ALD) is investigated. Uncoated phosphor powders degrade rapidly upon water immersion and lose their green phosphorescence within 48 hours of water exposure. Postmortem investigations reveal hydration and decomposition of the SrAl2O4 phase. ALD of ~10 nm Al2O3 or ~12 nm TiO2 is found to significantly improve the powder's resistance to aqueous degradation. All ALD‐coated powders show minimal structural and chemical degradation and retain phosphoresence after 48 hours of water immersion. This enhanced durability offers a new pathway for applying long afterglow phosphors to outdoor applications like roadway markings or safety signage and for their incorporation into more eco‐friendly waterborne coatings.

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{Al}_{2} {normalO}_{3} \cdot {3H}_{2} O

), similar to prior reports . These degradation products (eg, Sr 3 Al 2 (OH) 12 and (

{Al}_{2} {normalO}_{3} \cdot {3H}_{2} O

) match those previously reported and summarized in the chemical reactions shown above.…”

Section: Resultssupporting

confidence: 88%

Atomic layer deposition (ALD) of nanoscale coatings on SrAl₂O₄‐based phosphor powders to prevent aqueous degradation

et al. 2020

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“…However, aluminates are chemically unstable. Their luminescent properties will be degraded in moisture environment [6], but these phosphors initiated the application of Ln in long afterglow materials. After that, a Lns doped melilite comes into view.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and thermoluminescence of Ce3+ and Eu2+ in Ca2Al2SiO7 matrix

et al. 2011

Journal of Luminescence

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“…SrAl 2 O 4 :Eu 2+ ,Dy 3+ is chemically unstable to water or moisture 3) and difficult to mold singly, so it is generally commercialized by mixing with various resin or polymer. 4),5) However, weathering of them is not enough to maintain performance during a long time period.…”

Section: Introductionmentioning

confidence: 99%

Afterglow luminance property of phosphorescent phosphor SrAl2O4:Eu2+,Dy3+-glass composites

Yoshida¹,

Fujino

Kajiwara

2010

J. Ceram. Soc. Japan

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The effect of mixing ratio, firing temperature and matrix glass composition on afterglow luminance property of SrAl 2 O 4 : Eu 2+ ,Dy 3+ -glass composites were investigated. As a result, the brightness showed a maximum at 35 mass % of the mixing ratio of the phosphor for the glass and 780°C of the firing temperature. And it was increased with decreasing the Na 2 O content of the matrix glass. From the backscattered electron and the EDX analysis, it is thought that the intermediate layers generated between the phosphors and the Na 2 O-poor matrix glass work as antireflective and the phosphor particles in the composite emit phosphorescent light more efficiently. As higher the basicity parameter, B, the intermediate layer was clearer, which means that the reactivity at the phosphor/glass boundaries was lower, and the narrow reaction layers was formed.

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

Cited by 73 publications

References 11 publications

Atomic layer deposition (ALD) of nanoscale coatings on SrAl₂O₄‐based phosphor powders to prevent aqueous degradation

Atomic layer deposition (ALD) of nanoscale coatings on SrAl₂O₄‐based phosphor powders to prevent aqueous degradation

Photoluminescence and thermoluminescence of Ce3+ and Eu2+ in Ca2Al2SiO7 matrix

Afterglow luminance property of phosphorescent phosphor SrAl2O4:Eu2+,Dy3+-glass composites

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

Cited by 73 publications

References 11 publications

Atomic layer deposition (ALD) of nanoscale coatings on SrAl2O4‐based phosphor powders to prevent aqueous degradation

Atomic layer deposition (ALD) of nanoscale coatings on SrAl2O4‐based phosphor powders to prevent aqueous degradation

Photoluminescence and thermoluminescence of Ce3+ and Eu2+ in Ca2Al2SiO7 matrix

Afterglow luminance property of phosphorescent phosphor SrAl2O4:Eu2+,Dy3+-glass composites

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Atomic layer deposition (ALD) of nanoscale coatings on SrAl₂O₄‐based phosphor powders to prevent aqueous degradation

Atomic layer deposition (ALD) of nanoscale coatings on SrAl₂O₄‐based phosphor powders to prevent aqueous degradation