Fluorescent substance containing rare earth metal, luminous...

Compositions – Organic luminescent material containing compositions

Reexamination Certificate

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C313S503000, C313S486000, C534S015000

Reexamination Certificate

active

08080173

ABSTRACT:
The present invention provides a fluorescent substance excellent in emission intensity and in emission efficiency. The substance can be excited by light at a longer wavelength than ever. The present invention also provides a luminous composition comprising the fluorescent substance and a light-emitting element using the substance. The fluorescent substance comprises a rare earth metal and a phosphine oxide ligand which coordinates to said rare earth metal and said ligand containing at least one siloxane bond in its structure. The fluorescent substance can be produced from a reaction between a compound having a siloxane bond and a rare earth complex coordinated by a phosphine oxide ligand. The luminous composition comprises the fluorescent substance.

REFERENCES:
patent: 7250117 (2007-07-01), Iwanaga et al.
patent: 11-323324 (1999-11-01), None
patent: 2005-252250 (2005-09-01), None
patent: 3811142 (2006-06-01), None
patent: 2007-46021 (2007-02-01), None
U.S. Appl. No. 12/716,728, filed Mar. 3, 2010, Iwanaga, et al.
U.S. Appl. No. 11/958,111, filed Dec. 17, 2007, Shinji Murai.
Philip Lenaerts, et al. “Luminescent europium (III) and terbium (III) nicotinate complexes covalently linked to a 1,10-phenanthroline functionalised sol-gel glass”, Journal of Luminescence, 2006, vol. 117, pp. 163-169.
N. Filipescu et al.-“Substituent Effects on Intramolecular Energy Transfer. II. Fluorescence Spectra of Europium and Terbiumβ-Diketone Chelates”, The Journal of Physical Chemistry vol. 68, No. 11, Nov. 1964, pp. 3324-3346.
H. Iwanaga et al.-“Development of ultraviolet LED devices containing europium (III) complexes in fluorescence layer”, Journal of Alloys and Compounds, 408-412, (2006), pp. 921-925.

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