SOLID STATE LIGHT SOURCE WITH OPTICAL FILTER CONTAINING METAL DERIVATIVES OF TETRAPHENYLPORPHIN

• US 3,696,263 A
• Filed: 05/25/1970
• Issued: 10/03/1972
• Est. Priority Date: 05/25/1970
• Status: Expired due to Term

• Current Assignee: Paul Wacher
• Original Assignee: Paul Wacher
• Inventors: Wacher, Paul
• Primary Examiner(s): Lake, Roy
• Assistant Examiner(s): Demeo, Palmer C.
• Application Number:
  US05/040,940
• Time in Patent Office: 862 Days
• Field of Search: 313/18D,111,112 252/300
• US Class Current: 313/499
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating

Abstract

A solid state light source adapted for viewing in an environment of ambient light. A solid state light-emitting device is provided for emitting a narrow band of visible light. An optical filter is disposed in the path between the light emitting device and the viewer. The filter is a polymeric matrix which contains at least one metal derivative of tetraphenylporphin. In a preferred embodiment of the invention the polymeric matrix is an acrylic ester polymer which overlays the transparent encapsulating surface of a red-emitting GaAsP diode.

Claims

2. A solid state light source as defined by claim 1 wherein said polymeric matrix is an acrylic ester polymer.

3. A solid state light source as defined by claim 1 wherein said polymeric matrix is an acrylic ester polymer, said device is red-emitting and said acrylic ester polymer contains the platinum, tin dichloride, and manganese chloride derivatives of the tetraphenylporphin defined in claim 1.

4. A solid state light source as defined by claim 3 wherein said red-emitting device is a GaAsP diode.

5. A solid state light source as defined by claim 1 wherein said polymeric matrix is an acrylic ester polymer, said device is green-emitting and said acrylic ester polymer contains the platinum, manganese chloride and nickel derivatives of the tetraphenylporphin defined in claim 1 and a blue dye.

6. A solid state light source as defined by claim 5 wherein said green-emitting device is a GaP diode.

7. A solid state light source adapted for viewing in an environment of ambient light comprising:

a. a light-emitting diode for emitting a narrow band of visible wavelengths, b. transparent encapsulating means covering said diode, and c. an optical filter layer overlaying said encapsulating means, said layer comprising a polymeric matrix which contains at least one metal derivative of a tetraphenylporphin, said metal derivative having the formula;

8. A solid state light source as defined by claim 7 wherein said polymeric matrix is an acrylic ester polymer,

9. A solid state light source as defined by claim 7 wherein said polymeric matrix is an acrylic ester polymer, said diode is red-emitting and said acrylic ester polymer contains the platinum, tin dichloride and manganese chloride derivatives of the tetraphenylporphin defined in claim 7.

10. A solid state light source as defined by claim 9 additionally comprising a layer of ultraviolet screening material overlaying said filter layer.

11. A solid state light source as defined by claim 10 wherein said red-emitting diode is a GaAsP diode.

12. A solid state light source as defined by claim 7 wherein said polymeric matrix is an acrylic ester polymer, said diode is green-emitting and said acrylic ester polymer contains the platinum, manganese chloride and nickel derivatives of the tetraphenylporphin defined in claim 7 and a blue dye.