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 language | American English |
---|---|
Journal | Journal of the Electrochemical Society |
Volume | 157 |
DOIs | |
State | Published - Jan 1 2010 |
Disciplines
- Physics
Keywords
- Barium compounds
- Cathode-ray tubes
- Crystal structure
- Europium
- Phosphorescence
- Phosphors
- Powder technology
- Thermoluminescence
- X-ray tubes