Light emitting device and illuminator using the same

Details Light emitting device and illuminator using the same Light emitting device and illuminator using the same

2008-04-15

2008-04-15

Koslow, C. Melissa (Department: 1793)

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

C252S30140P, C252S30140F, C252S30140H, C252S30160R, C252S30160F, C252S30160P, C313S503000, C257S098000

Reexamination Certificate

active

07357882

ABSTRACT:
An object of the present invention is to provide a light emitting device having a high emission intensity, and a light emitting device having a high emission intensity and a good color rendering property.The present invention provides a light emitting device which comprises:a first light emitter emitting light of from 350 to 415 nm anda second light emitter emitting visible light by exposure to the light from the first light emitter, wherein said second light emitter comprises a phosphor capable of satisfying any one of the following conditions (i) to (iv):(i) the phosphor comprises:(a) a crystal phase whose Eu concentration providing the maximum emission intensity at any one of excitation wavelengths of from 350 to 415 nm is higher than that providing the maximum emission intensity at an excitation wavelength of 254 nm; and(b) a crystal phase which is activated by Eu having at least 1.1 times the concentration providing the maximum emission intensity at an excitation wavelength of 254 nm and 0.5 to 9 times the concentration providing the maximum emission intensity at an excitation frequency of 400 nm:(ii) the phosphor comprises a crystal phase having an Eu—Eu mean distance, as calculated from the Eu concentration in a crystal matrix, of 4 Å or greater but not greater than 11 Å:(iii) the phosphor has a quantum absorption efficiency αqof 0.8 or greater:(iv) the phosphor has a product αq·ηiof a quantum absorption efficiency αqand an internal quantum efficiency ηiof 0.55 or greater.

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