Phosphor and production process for the same

Details Phosphor and production process for the same Phosphor and production process for the same

2007-12-04

2007-12-04

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

Zinc or cadmium containing

C252S30140F, C252S301360, C428S403000, C428S407000, C977S811000, C977S834000

Reexamination Certificate

active

11038112

ABSTRACT:
The object of the present invention is to provide a phosphor which is excellent in transparency, light transmittance, luminescence efficiency and luminescent intensity and at the same time, processes for producing the phosphor. Preferred embodiments of the invention include a phosphor characterized in that phosphor particles represented by the general formula [(L)a(M)b(N)cOd:Y] are covered with an organic compound bearing at least one functional group at a terminal or side chain, wherein L is a metallic element such as Zn; M is a metallic element such as Al; N is Si or Ge; O is oxygen; Y is at least one activating agent such as Mn2+, Eu2+, Cu2+or Yb2+; and a, b, c and d are each a value satisfying the relationships 0<a≦2, 0≦b≦2, 0≦c≦2 and 2a+3b+4c=2d.

REFERENCES:
patent: 5985173 (1999-11-01), Gray et al.
patent: 7041371 (2006-05-01), Ogura et al.
Miki et al, “Low-Temperature Synthesis of Nanosize Zn2SiO4:Mn2+ Phosphor from the Precursor Sol in Supercritical Ethanol and its Photoluminescent Properties”,Journ. Sol-Gel Sci Tech., #31, pp. 73-77, Aug. 2004.
Ahmadi, et al. Materials Research Bulletin 35 (2000) 1869-1879, “Low-temperature synthesis of pure and Mn-doped willemite phosphor (Zn2SiO4:Mn) in aqueous medium”, institute of Physical Chemistry, University of Hamburg, Bundesstrasse 45, D-20146 Hamburg, Germany.
Cannas, et al. J. Mater. Chem., 1999, 9, 1765-1769, “XRD, TEM and29Si MAS NMR study of sol-gel ZnO-SiO2nanocomposites”, Dipartimento di Scienze Chimiche, Universita di Cagliari, Via Ospedale 72, I-0124 Cagliar, Italy.
Miki, et al. “Low-temperature synthesis and optical properties of (Zn2SiO4:Mn24) phosphor in a supercritical ethanol solvent” (Kelo Univ.) OT Miki, T. Isobe, Luminescent Ir (III) complexes-Electrochemical and Photochemical behaviors-(Nara University of Education, Osaka University) Takeko Matsumura-Inove, O Yuko Yamamoto, Naokazu Yoshikawa, Yasuchika Hasegawa, and Shozo Yanakida, Phosphor Research Society, The 292ndmeeting technical digest, Apr. 3, 2002.

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