Light emitting device having a nitride compound semiconductor an

Details Light emitting device having a nitride compound semiconductor an Light emitting device having a nitride compound semiconductor an

1997-07-29

1999-12-07

Patel, Vip

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

313498, 313501, 313502, 257103, H01J 162, H01J 6304

Patent

active

059989254

ABSTRACT:
The white light emitting diode comprising a light emitting component using a semiconductor as a light emitting layer and a phosphor which absorbs a part of light emitted by the light emitting component and emits light of wavelength different from that of the absorbed light, wherein the light emitting layer of the light emitting component is a nitride compound semiconductor and the phosphor contains garnet fluorescent material activated with cerium which contains at least one element selected from the group consisting of Y, Lu, Sc, La, Gd and Sm, and at least one element selected from the group consisting of Al, Ga and In and, and is subject to less deterioration of emission characteristic even when used with high luminance for a long period of time.

REFERENCES:
patent: 3699478 (1972-10-01), Pinnow et al.
patent: 4298820 (1981-11-01), Bongers et al.
patent: 4727283 (1988-02-01), Van Kemenade et al.
patent: 5798537 (1998-08-01), Nitta
"A New Phosphor for Frying-Spot Cathode-Ray Tubes for Color Television: Yellow-Emitting Y.sub.3 a1.sub.5 O.sub.12 -Ce.sup.3+ ", G. Glasse et al., Applied Physics Letters, vol. 11, No. 2, pp. 53-54 (1967).
"Improved color rendition in high pressure mercury vapor lamps", Mary V. Hoffman, Journal of IES, pp. 89-91 (1977).
S. Nakamura, SPIE, 3002:26-35 (1997).

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