Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1994-05-18
1995-06-06
Bell, Mark L.
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C09K 1170, C09K 1181
Patent
active
054220408
ABSTRACT:
This invention relates to a novel phosphate based green phosphor represented by the formula (Ln.sub.1-x-y Ce.sub.x Tb.sub.y) PO.sub.4 .multidot.wM where Ln refers to one or more than one of La, Gd, Y and M refers to one or more than one oxide of B.sub.2 O.sub.3, Al.sub.2 O.sub.3, In.sub.2 O.sub.3, ZrO.sub.2, Nb.sub.2 O.sub.5 and TiO.sub.2. Requisite materials are processed through blending, prefiring, firing and post-firing treatments to form the high performance phosphate based green phosphor. The processing steps of this invention effectively obviate the difficulties as associated with the prior technology, substantially improve the phosphor brightness, thermal stability, enlarge the specific surface of the phosphor, and reduce the phosphor consumption in screen coating, thereby reducing the picture tube manufacturing cost and eventually yielding the novel high performance phosphate based green phosphor.
REFERENCES:
patent: 4764301 (1988-08-01), Awazv et al.
"Effect of Thorium on Ce.sup.+3 Phosphors," Mary V. Hoffman, J. Electrochem, Soc.: Solid State Science, vol. 118, No. 9, Sep. 1971.
"Phosphors Based on Rare Earth Phosphates," R. C. Ropp, J. Electrochem, Soc.: Solid State Sciecne, vol. 115, No. 8, Aug. 1968.
Abstract, 76-Electric Phenomena, vol. 19, 1979, 91:100982u, Phosphor, no agent.
Abstract appearing in 73-Spectroscopy, vol. 96, 1982, 96:208178d Green-emitting cerium terbium phosphate phosphor.
Bingquan Li
Guanmin Zhang
Jianping Jiang
Maofu Tong
Yongli Liu
Bell Mark L.
Bonner C. M.
Shanghai Yue Long Nonferrous Metals Ltd.
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