Title:
RED LIGHT EMITTING PHOSPHOR, ITS PRODUCTION AND LED LAMP
Document Type and Number:
Japanese Patent JP3950543
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a red light emitting phosphor capable of efficiently absorbing ultraviolet rays at the excitation wavelength 370 nm of a light emitting diode or thereabout to emit red light in high efficiency and practically usable in the light emitting diode to allow a single light emitting diode to emit white color light or arbitrary medium color light, its production process and an LED lamp produced by using the phosphor.
SOLUTION: This phosphor is a europium.samarium-doped lanthanum oxysulfide phosphor expressed by the formula; (La1-x-yEuxSmy)2O2S (0.01≤x≤0.15; 0.0001≤y≤0.03). Preferably, the peak wavelength in an excitation spectrum distribution exists in an ultraviolet wavelength region of 360-380 nm and the atomic ratio (x) of europium (Eu) in the formula is 0.03-0.08.
Inventors:
Nobuyuki Sudo
Kenji Terashima
Kenji Terashima
Application Number:
JP4827598A
Publication Date:
August 01, 2007
Filing Date:
February 27, 1998
Export Citation:
Assignee:
Toshiba Electronic Engineering Co., Ltd.
Toshiba Corporation
Toshiba Corporation
International Classes:
C09K11/08; C09K11/84; (IPC1-7): C09K11/84; C09K11/08
Domestic Patent References:
| JP5070775A | ||||
| JP5078660A | ||||
| JP52078783A | ||||
| JP48020108B1 |
Attorney, Agent or Firm:
Hisashi Hatano
Shunguchi Sekiguchi
Shunguchi Sekiguchi