| US 7,510,784 B2 | ||
| Light emitting device formed using rare earth complex and luminescent medium | ||
| Hiroki Iwanaga, Yokohama (Japan); Fumihiko Aiga, Yokohama (Japan); Naomi Shida, Tokyo (Japan); and Akio Amano, Kawasaki (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Jun. 14, 2007, as Appl. No. 11/763,197. | ||
| Application 11/763197 is a continuation of application No. 10/873282, filed on Jun. 23, 2004, granted, now 7,250,117. | ||
| Claims priority of application No. 2003-179811 (JP), filed on Jun. 24, 2003. | ||
| Prior Publication US 2007/0236129 A1, Oct. 11, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H01L 51/50 (2006.01) | ||
| U.S. Cl. 428—690 [428/917; 313/504; 313/506] | 17 Claims |
| 1. A light emitting device, comprising:
a light emitting element; and
a luminescent medium formed on the light emitting element;
wherein:
the luminescent medium comprises a fluorine-based polymer and the rare earth complex dispersed therein, the rare earth complex
being represented by the following formula (2):
 wherein Ln is a rare earth metal ion selected from the group consisting of europium, terbium and erbium; X and Y are the same
or different and are individually O, S or Se; R1, R2, R3, R4, R5 and R6 are the same or different, excluding a situation where R1, R2, R3 and R4 are all the same as each other, and are individually an alkyl or alkoxy group of a linear or branched structure having not
more than 20 carbon atoms, a phenyl group, a biphenyl group, a naphthyl group, a heterocyclic group or a substitution product
of any of these groups; n is an integer ranging from 2 to 20; m and p are respectively an integer ranging from 1 to 5; and
Z and W are the same or different and are individually a hydrogen atom, a deuterium atom, a halogen atom or an alkyl group.
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