Efficient cooling of lasers, led and photonics devices

Patent metadata

Field	Value
Publication number	US-2016186979-A1
Application number	US-201615062823-A
Country	US
Kind code	A1
Filing date	Mar 7, 2016
Priority date	Jun 29, 2007
Publication date	Jun 30, 2016
Grant date	—

Abstract

The present invention provides an optoelectronic device comprising a heat source and a heat transfer fluid. The present invention also provides a method of preparing an optoelectronic device, which comprises (i) providing a heat source, and (ii) filling a space in the vicinity of the heat source with a heat transfer liquid. The optoelectronic device has gained technical merits such as improved heat removing efficiency, lower chip/junction temperature, increased lumen output, longer operational lifetime, and better reliability, among others.

First claim

1 . A lamp comprising a heat source selected from a light generating light emitting diode (LED) or laser and a light transmissive housing, and wherein a heat transfer fluid at least substantially fills a space between said light transmissive housing and the heat source.

2 . The lamp according to claim 1 , in which the heat transfer fluid is dielectric and does not cause any shorts in the optoelectronic device, wherein the fluid preferably has an optical absorption of less than about 2%/mm at any wavelength in the range of from about 300 nm to about 800 nm; the heat transfer fluid is a dielectric fluid with a volume resistivity (25° C.) of at least 1M (Ωcm), as measured with the method of ASTM D-257; the refractive index of the heat transfer fluid ranges from about 1.2 to about 2.5 at any wavelength in the range of from about 400 nm to about 800 nm; and the thermal expansion by volume of the heat transfer fluid at 25° C. ranges from about 0.000001 cc/cc/° C. to about 0.001 cc/cc/° C., as measured with the method of ASTM D-1903.

3 . The lamp according to claim 1 , in which the heat transfer fluid is selected from the group consisting of perfluorocarbon (PFC), polychlorinated biphenyl (PCB), dimethyl silicone, hydrocarbon oil, mineral oil, paraffinic oil, naphthenic oil, aromatic hydrocarbon, polyalphaolefin, polyol ester, vegetable oil, nano-fluids, and the mixture thereof.

4 . The lamp according to claim 1 , in which the heat transfer fluid comprises Fluorinert liquid FC-72, Novec fluid such as HFE 7100, Lightspan™ LS-5252, or any combination thereof.

5 . The lamp according to claim 3 , in which the aromatic hydrocarbon comprises triaryl methanes, triaryl ethanes, diaryl methanes, diaryl ethanes, alkylated biphenyls, monoaromatics with large alkyl groups, naphthalenes, and the mixture thereof.

6 . The lamp according to claim 3 , in which the polyalphaolefins are derived from the polymerization of hexene (C 6 ), octene (C 8 ), decene (C 10 ) or dodecene (C 12 ).

7 . The lamp according to claim 3 , in which the vegetable oil comprises a triglyceride molecule with the general formula:

wherein R 1 , R 2 , and R 3 are independently of each other selected from C 4 to C 22 hydrocarbon chains with 0 to 3 unsaturation levels.

8 . The lamp according to claim 1 , in which the heat transfer fluid further comprises dispersed phosphor particles with a size of from 1 nm to 5000 nm.

9 . (canceled)

10 . The lamp according to claim 9 , in which the LED contains a Group III-V compound semiconductor layer such as GaAs, GaAlAs, GaN, InGaN, or GaP; a Group II-VI compound semiconductor layer such as ZnSe, ZnSSe, or CdTe; or a Group IV-IV semiconductor layer such as SiC.

11 . The lamp according to claim 1 , further comprising a solid cooling means and/or an air cooling means.

12 . (canceled)

13 . The lamp according to claim 1 , which is a LED package and the heat transfer liquid, locates in the vicinity of bulb/frontal surface area.

14 . (canceled)

15 . (canceled)

16 . (canceled)

17 . The lamp according to claim 1 , which comprises a first body of heat transfer fluid located in the top-side of the heat source; and a second body of heat transfer fluid located in the back-side of the heat source.

18 . The lamp according to claim 17 , in which a synthetic jet actuator is operated with the second body of heat transfer fluid.

19 . The lamp according to claim 17 , in which the second body of heat transfer fluid is circulated to a heat exchanger located outside the body of fluid.

20 . The lamp according to claim 1 , which has a heat removing efficiency at least about 10% higher than that of the same optoelectronic device but without the heat transfer fluid.

21 . A method of preparing a lamp, which comprises (i) providing an LED or laser light and heat source, and (ii) filling a space in the vicinity of the heat source with a heat transfer liquid which is hermetically sealed.

22 . (canceled)

23 . (canceled)

24 . The lamp of claim 17 , wherein said heat source is disposed on a front surface of a printed circuit board (PCB) and said first body of heat transfer fluid is in direct contact with the heat source and said second body of heat transfer fluid is in direct contact with a back surface of the PCB.

25 . The lamp of claim 1 , wherein said fluid comprises an oil.

26 . The lamp of claim 1 , further comprising a phosphor in association with the light transmissive housing.

27 . The lamp of claim 1 , wherein a flash point of the fluid is at least 175° C.

Assignees

• Arik Mehmet
• Weaver Jr Stanton Earl
• Ge Lighting Solutions Llc

Inventors

• Arik Mehmet
• Weaver Jr Stanton Earl

Classifications

• H10H20/854

  characterised by their material, e.g. epoxy or silicone resins · CPC title

• H10H20/0365

  of means for heat extraction or cooling · CPC title

• H10H20/8586

  comprising fluids, e.g. heat-pipes · CPC title

• H10H20/8583

  not being in contact with the bodies · CPC title

• H10H20/8515

  not being in contact with the bodies · CPC title