Light-emitting diode device for voltage switchable dielectric material having high aspect ratio particles

• US 7,968,015 B2
• Filed: 07/07/2010
• Issued: 06/28/2011
• Est. Priority Date: 07/29/2006
• Status: Expired due to Fees

• Current Assignee: Littelfuse Incorporated
• Original Assignee: Shocking Technologies, Inc.
• Inventors: Kosowsky, Lex, Fleming, Robert
• Primary Examiner(s): Kopec; Mark
• Assistant Examiner(s): Thomas; Jaison P
• Application Number:
  US12/832,040
• Publication Number:
  US 20100271831A1
• Time in Patent Office: 356 Days
• Field of Search: 252/500, 252/502, 252/511, 361/56
• US Class Current: 252/511
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: H01C 17/0652 containing carbon or carbides
• CPC Class Codes: H01C 7/1006 Thick film varistors
• CPC Class Codes: H01C 7/105 Varistor cores H01C7/12 takes precedence
• CPC Class Codes: H05K 1/0257 Overvoltage protection
• CPC Class Codes: H05K 1/0259 Electrostatic discharge [ESD] protection
• CPC Class Codes: H05K 1/0373 containing additives, e.g. fillers H05K1/036 takes precedence
• CPC Class Codes: H05K 1/167 incorporating printed resistors
• CPC Class Codes: H05K 2201/0248 Needles or elongated particles; Elongated cluster of chemically bonded particles
• CPC Class Codes: H05K 2201/0257 Nanoparticles
• CPC Class Codes: H05K 2201/026 Nanotubes or nanowires
• CPC Class Codes: H05K 2201/0272 Mixed conductive particles, i.e. using different conductive particles, e.g. differing in shape
• CPC Class Codes: H05K 2201/0738 Use of voltage responsive materials, e.g. voltage switchable dielectric or varistor materials
• CPC Class Codes: H05K 2203/0723 Electroplating, e.g. finish plating
• CPC Class Codes: H05K 2203/105 Using an electrical field; Special methods of applying an electric potential
• CPC Class Codes: H05K 3/188 by direct electroplating
• CPC Class Codes: Y10S 977/742 Carbon nanotubes, CNTs
• CPC Class Codes: Y10S 977/779 Possessing nanosized particles, powders, flakes, or clusters other than simple atomic impurity doping
• CPC Class Codes: Y10T 428/30 : Self-sustaining carbon mass or layer with impregnant or other layer
• CPC Class Codes: Y10T 428/31678 : Of metal

Abstract

One or more embodiments provide for a light emitting diode device that utilizes voltage switchable dielectric material having semi-conductive or conductive materials that have a relatively high aspect ratio.

Claims

1. A light emitting diode (LED) device comprising:

a non-linear resistive polymer composition comprising a concentration of nano-dimensioned particles that individually have an aspect ratio that is greater than 10;

1;

wherein said composition is (i) insulative in absence of any voltage that exceeds a characteristic voltage level, and (ii) conductive with application of a voltage that exceeds the characteristic voltage level; and

wherein the polymer composition is positioned to protect the LED against transient electrical events.

2. The LED device of claim 1, wherein the concentration of nano-dimensioned particles individually have an aspect ratio that is of an order of 100:

1 or greater.

3. The LED device of claim 1, wherein the concentration of nano-dimensioned particles are organic.

4. The LED device of claim 3, the concentration of nano-dimensioned particles include fullerenes.

5. The LED device of claim 3, the concentration of nano-dimensioned particles include carbon nanotubes.

6. The LED device of claim 3, wherein the concentration of nano-dimensioned particles include metallic nanowires or nanorods.

7. The LED device of claim 1, further comprising a concentration of conductor and/or semiconductor particles, and wherein a combined concentration of the nano-dimensioned particles and the conductor and/or semiconductor particles is below a percolation threshold of the polymer composition.

8. The LED device of claim 1, further comprising a printed circuit board on which at least a portion of the polymer composition is provided.

9. The LED device of claim 1, wherein the LED device is provided as a package.

10. The LED device of claim 1, further comprising a separate concentration of polymer phase particles.

11. The LED device of claim 1, further comprising a concentration of metal particles.

12. The LED device of claim 1, wherein the concentration of metal particles selected from the group consisting of copper, gold, silver, nickel, or cobalt and mixtures thereof.