Method of making terbium activated yttrium aluminate phosphor

Patent · Tue Aug 09 04:00:00 EDT 1988

OSTI ID:6357311

Kasenga, A F; Dann, J N

This patent describes the method of making Y/sub 3/Al/sub 5/O/sub 12/:Tb phosphor, the method comprising: (a) forming a uniform mixture of source materials for Y/sub 3/Al/sub 5/O/sub 12/:Tb phosphor and barium fluoride with the barium fluoride being present in the mixture at a level of from about 0.254 to about 0.761 weight percent; and (b) firing the mixture at an elevated temperature to react the source materials to form Y/sub 3/Al/sub 5/O/sub 12/:Tb phosphor having an improved brightness of at least about 7.5% over the phosphor prepared as above the absent barium fluoride, with the 50% size of the phosphor prepared as above with BaF/sub 2/ as measured by Coulter Counter technique being from about 5 to about 7 micrometers in diameter and with from about 1% to about 6% of the phosphor having a size of greater than about 20 micrometers in diameter.

• Assignee: GTE Products Corp., Stamford, CT
• Patent Number(s): US 4762639
• OSTI ID: 6357311
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
ALUMINATES
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM FLUORIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
COUNTING TECHNIQUES
DISPERSIONS
ELEMENTS
ENERGY
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
METALS
MIXTURES
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHOSPHORS
PHYSICAL PROPERTIES
RARE EARTHS
SYNTHESIS
TERBIUM
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS