Optoelectronic device with upconverting luminophoric medium
a technology of optoelectronic devices and luminophoric medium, which is applied in the direction of fluid heaters, air heaters, lighting and heating apparatuses, etc., can solve the problems of degrading device performance and optoelectronic devices, and achieve the effect of improving performan
Inactive Publication Date: 2013-02-28
CREE INC
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Benefits of technology
The use of upconverting materials like anti-Stokes phosphors efficiently converts waste heat into visible light, reducing thermal stress and eliminating the need for conventional cooling structures, thereby improving the performance and longevity of optoelectronic devices like LEDs.
Problems solved by technology
Heat generation is a persistent problem in electronic devices, since excessive heating can damage microelectronic components and circuitry as well as degrade device performance.
Optoelectronic devices are subject to the same thermal management issues as electronic devices generally, and utilize corresponding approaches of dissipating heat via conduction, radiation, convection and / or direct mechanical cooling.
Method used
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[0029]The present invention relates to microelectronic devices, e.g., optoelectronic devices including light emitting diodes (LEDs), and to methods and arrangements for thermal management of such devices to achieve improved performance.
[0030]The term “anti-Stokes” as used herein in reference to luminophoric (light-emitting) materials refers to materials that do not conform to Stoke's second law that a material's luminescent emission is lower in photon energy than absorbed incident photon energy. A Stokes material, by contrast, follows such law, and exhibits a so-called Stokes shift when it absorbs incident radiation and responsively emits luminescence of a lower energy, at longer wavelength.
[0031]By way of example, an anti-Stokes material such as a phosphor may be sensitive to radiation in a wavelength range of 1500-1610 nm and responsively emit light in a wavelength range of 950-1075 nm. Many such materials are known, including materials doped with triply ionized rare earth ions su...
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A microelectronic device that in operation generates or includes component(s) that generate heat, in which the device comprises a heat conversion medium that converts such heat into a light emission having a shorter wavelength than such heat, to thereby cool the device and dissipate the unwanted heat by such light output. The heat conversion medium can include an upconverting luminophoric material, e.g., an anti-Stokes phosphor or phosphor composition. The provision of such heat conversion medium enables thermal management of microelectronic devices, e.g., optoelectronic devices, to be achieved in an efficient manner, to prolong the operational service life of devices such as LEDs, laser diodes, etc. that are degraded in performance by excessive heat generation in their operation.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This is a continuation under 35 USC 120 of U.S. patent application Ser. No. 11 / 832,785 filed Aug. 2, 2007 in the name of George R Brandes for “OPTOELECTRONIC DEVICE WITH UPCONVERTING LUMINOPHORIC MEDIUM,” issuing Oct. 30, 2012 as U.S. Pat. No. 8,297,061. The disclosure of U.S. patent application Ser. No. 11 / 832,785 is hereby incorporated herein by reference, in its entirety, for all purposes.FIELD OF THE INVENTION[0002]The present invention relates to optoelectronic devices, and to methods and arrangements for operation and / or thermal management of such devices to achieve improved performance, by the use of upconverting media.DESCRIPTION OF THE RELATED ART[0003]Heat generation is a persistent problem in electronic devices, since excessive heating can damage microelectronic components and circuitry as well as degrade device performance. Present approaches to dissipating heat in integrated circuitry and microelectronic devices rely on heat s...
Claims
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IPC IPC(8): H01L33/64F28F9/00H01L33/44H01L33/50
CPCC09K11/7771H01L33/44H01L33/502Y10T29/4935H01L33/60H01L33/644H01L33/507H01L2224/48091H01L2924/00014
InventorBRANDES, GEORGE R.
OwnerCREE INC