Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1997-05-22
1999-02-09
Bonner, Melissa
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C09K 1164, C09K 1155
Patent
active
058689630
ABSTRACT:
The disclosure relates to a family of luminophors Ba.sub.z -Al.sub.12-x Mn.sub.x O.sub.19 with 0.8.ltoreq.z.ltoreq.1.3, wherein x ranges from 0.2 to 0.7 and has a time of decay, to 10% of the light energy emitted, of less than about 15 ms. It also relates to a method for the manufacture of this family of luminophors having a time of decay, to about 10% of the initial light intensity emitted, of less than about 15 ms. It also relate to a method for the manufacture of this family of luminophors, using a primary vacuum step in order to obtain a neutral or reductive atmosphere with an oxygen content of less than about 10 particles per million (ppm). This method has the great value of enabling the formation of barium hexa-aluminate with a high manganese content to lower the decay time while, at the same time, preserving high luminous efficiency. Application to high-definition television.
REFERENCES:
patent: 4085351 (1978-04-01), Takahashi et al.
Robertson et al, "luminescet Single Crystal Thin Flims of Manganese Doped Barium Hexa-aluminate", Physica Status Solidi A, vol. 63, No. 1, pp. K59-62, Jan. 16, 1981.
Fur Adele Le
Thi Mai Pham
"Thomson-CSF"
Bonner Melissa
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