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Title:
LIGHT SOURCE HAVING LIGHT-EMITTING DEVICE
Document Type and Number:
Japanese Patent JP2007189239
Kind Code:
A
Abstract:

To generate a white light color having a high color temperature, while simultaneously achieving high efficiency and high color rendering, in particular, to cause a color position within a tolerance ellipse determined for general illumination by the International Commission on Illumination (CIE) to be generated.

A light source, having a light-emitting device and a phosphor, wherein the light-emitting device, emits light in a first spectral range and the phosphor is derived from a group of alkaline earth metal orthosilicates, absorbs a part of the light emitted from the light-emitting device, and emits a light in another spectral range. The phosphor is made of an alkaline earth metal orthosilicate activated by divalent europium, represented as (2-x-y)SrO x(Bau, Cav)O (1-a-b-c-d)SiO2aP2O5bAl2O3cB2O3dGeO2:yEu2+ (where 0<x<1.6, 0.005<y<0.5, x+y≤1.6, 0≤a, b, c, d<0.5, and u+v=1) and/or an alkaline earth metal orthosilicate, represented as (2-x-y)BaO x(Sru, Cav)O (1-a-b-c-d)SiO2aP2O5bAl2O3cB2O3dGeO2:yEu2+ (where 0.01<x<1.6, 0.005<y<0.5, 0≤a, b, c, d<0.5, u+v=1, and x×u≥0.4).


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Inventors:
TASCH STEFAN
PACHLER PETER
ROTH GUNDULA
TEWS WALTER
WOLFGANG KEMPFERT
DETLEF STARICK
Application Number:
JP2007023598A
Publication Date:
July 26, 2007
Filing Date:
February 01, 2007
Export Citation:
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Assignee:
TOYODA GOSEI KK
TRIDONIC OPTOELECTRONICS GMBH
LITEC GBR
LEUCHTSTOFFWERK BREITUNGEN
International Classes:
H01L33/50; C09K11/08; C09K11/63; C09K11/64; C09K11/66; C09K11/71; C09K11/77; C09K11/79; C09K11/81; C09K11/82; C09K11/84; F21V9/40; H05B33/20; C09K11/59; F21Y105/10; F21Y115/10; H01L33/06; H01L33/32
Domestic Patent References:
JPH10247750A1998-09-14
JP2000349346A2000-12-15
JP2000150966A2000-05-30
JPS6244792B21987-09-22
JPS6013882A1985-01-24
JP2000510647A2000-08-15
JP2004501512A2004-01-15
JP2004505470A2004-02-19
Foreign References:
WO2000033389A12000-06-08
WO1998005078A11998-02-05
WO2000033390A12000-06-08
Attorney, Agent or Firm:
Tadao Hirata



 
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