Long-Lasting Phosphorescence in BaSi2O2N2:Eu2+ and Ba2SiO4:Eu2+ Phases for X-Ray and Cathode Ray Tubes

Meiyuan Wang, Xia Zhang, Zhendong Hao, Xinguang Ren, Yongshi Luo, Haifeng Zhao, Xiaojun Wang, Jiahua Zhang

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Abstract

We report the long-lasting bluish-green phosphorescence for X-ray or cathode ray tubes in the phosphors with compositions of either Ba2 SiO4:0.01 Eu2+ -x Si3 N4 (x=0-1) or 2 BaCO3 -y Si3 N4:0.01 Eu2+ (y=1/6-1) synthesized by a solid-state reaction. By tuning the Si3 N4 content, the phosphorescence may originate from Eu2+ in BaSi2 O2 N2 (peaking at 490 nm), Ba 2 SiO4 (505 nm), and Ba3 SiO5 (590 nm) phases. The strong phosphorescence of the Ba2 SiO4: Eu2+ phase in 2 BaCO3 -y Si3 N4:0.01 Eu2+ is attributed to N substitution for O to generate a shallow trap. In Ba2 SiO4:0.01 Eu2+ -x Si3 N 4, however, N prefers reacting with Ba2 SiO4 to form BaSi2 O2 N2, thereby exhibiting a strong phosphorescence of the BaSi2 O2 N2: Eu 2+ phase but a weak phosphorescence of the Ba2 SiO 4: Eu2+ phase.

Original languageAmerican English
JournalJournal of the Electrochemical Society
Volume157
DOIs
StatePublished - Jan 1 2010

Disciplines

  • Physics

Keywords

  • Barium compounds
  • Cathode-ray tubes
  • Crystal structure
  • Europium
  • Phosphorescence
  • Phosphors
  • Powder technology
  • Thermoluminescence
  • X-ray tubes

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