Illumination System Comprising a Ceramic Luminescence Converter

• US 20080191608A1
• Filed: 04/13/2006
• Published: 08/14/2008
• Est. Priority Date: 04/20/2005
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Schmidt, Peter J.
• Application Number:
  US11/911,675
• Publication Number:
  US 20080191608A1
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: C04B 2235/3208 Calcium oxide or oxide-forming salts thereof, e.g. lime
• CPC Class Codes: C04B 2235/3213 Strontium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3224 Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
• CPC Class Codes: C04B 35/547 based on sulfides or selenides or tellurides
• CPC Class Codes: C09K 11/0883 Arsenides; Nitrides; Phosphides
• CPC Class Codes: C09K 11/7718 with alkaline earth metals
• CPC Class Codes: C09K 11/7731 with alkaline earth metals
• CPC Class Codes: C09K 11/77342 Silicates
• CPC Class Codes: C09K 11/77347 Silicon Nitrides or Silicon Oxynitrides
• CPC Class Codes: C09K 11/77348 Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73253 Bump and layer connectors
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/16195 Flat cap [not enclosing an internal cavity]
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source

Abstract

An illumination system, comprising a radiation source and a monolithic ceramic luminescence converter comprising at least one phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of wavelength different from that of the absorbed light; wherein said at least one phosphor is an alkaline earth metal sulfide of general formula AE_1-zS_1-ySe_y:A_z, wherein AE is at least one earth alkaline metal selected from the group of Mg, Ca, Sr and Ba, 0≦y<1 and 0.0005≦z≦0.2, activated by an activator A selected from the group of Eu(II), Ce(III), Mn(II) and Pr(III). is highly efficient, especially if a blue light emitting diode is used as a radiation source, and provides excellent thermal and spectroscopic properties. The invention is also concerned with a monolithic ceramic luminescence converter comprising at least one phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of wavelength different from that of the absorbed light; wherein said at least one phosphor is an alkaline earth metal sulfide of general formula AE_1-zS_1-ySe_y:A_z, wherein AE is as least one earth alkaline metal selected from the group of Mg, Ca, Sr and Ba, 0≦y<1 and 0.0005≦z≦0.2, activate by an activator A selected from the group of Eu(II), Ce(II), Mn(II) and Pr(III).

Claims

1. Illumination system, comprising a radiation source and a monolithic ceramic luminescence converter comprising at least one phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of wavelength different from that of the absorbed light;

wherein said at least one phosphor is an alkaline earth metal sulfide of general formula AE_1-zS_1-ySe_y;

A_z, wherein AE is as least one earth alkaline metal selected from the group of Mg, Ca, Sr and Ba, 0≦

y<

1 and 0.0005≦

z≦

0.2, activated by an activator A selected from the group of Eu(II), Ce(III), Mn(II) and Pr(III).

2. Illumination system according to claim 1, wherein said radiation source is a light-emitting diode.

3. Illumination system according to claim 2, comprising a protective coating attached to said monolithic ceramic luminescence converter.

4. Illumination system according to claim 3, wherein the protective comprises a ceramic material, selected from the group of silica SiO₂, alumina Al₂O₃ and yttria Y₂O₃.

5. Illumination system according to claim 3, wherein the protective comprises a glass.

6. Illumination system according to claim 1, wherein said monolithic ceramic luminescence converter is a first luminescence converter element, further comprising one or more additional luminescence converter elements.

7. Illumination system according to claim 3, wherein the additional luminescence converter element is a coating, comprising a resin-bonded phosphor pigment.

8. Illumination system according to claim 3, wherein the additional luminescence converter element is a second monolithic ceramic luminescence converter, comprising a second phosphor.

9. Monolithic ceramic luminescence converter comprising at least one phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of wavelength different from that of the absorbed light;

wherein said at least one phosphor is an alkaline earth metal sulfide of general formula AE_1-zS_1-ySe_y;

A_z, wherein AE is as least one earth alkaline metal selected from the group of Mg, Ca, Sr and Ba, 0≦

y<

1 and 0.0005≦

z≦

0.2, activated by an activator A selected from the group of Eu(II), Ce(III), Mn(II) and Pr(III).