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Led lamp with remote phosphor coating and method of making the lamp

A phosphor and LED chip technology, applied in coatings, semiconductor devices of light-emitting elements, lampshades, etc., can solve problems such as complex, expensive sensing and feedback control mechanisms, and insufficient accommodation for LED drivers and control systems

Inactive Publication Date: 2011-05-25
OSRAM SYLVANIA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the two materials have different thermal properties, complex and expensive sensing and feedback control mechanisms are required to stabilize the white point
This technique is not suitable for small MR16 lamps; there is simply not enough space to accommodate both the LED driver and the control system, and such replacement lamps may not have sufficient heat dissipation area to maintain the low InGaAlP junction temperatures required for this technique

Method used

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  • Led lamp with remote phosphor coating and method of making the lamp
  • Led lamp with remote phosphor coating and method of making the lamp
  • Led lamp with remote phosphor coating and method of making the lamp

Examples

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example

[0049] In a specific example, a suspension of cellulosic polymer and YAG:Ce phosphor particles is made into a sheet by extrusion. The sheet was adhered to the cylindrical substrate by wetting the substrate with isopropanol and applying pressure. The solvent softens the sheet and allows extrusion of air bubbles while providing sufficient adhesion of the sheet to the substrate. The coated cylinders were baked in air at 900°F to burn off the polymer, leaving the polymer coated cylinders. Substrates with less complex shapes can be coated by mixing phosphor with silicone, which is then applied to the substrate and cured. In this instance, the silicone adhesive is not removed after application. Note that heating to 900°F in air would render phosphors that convert blue to red-orange unusable, and in this case a different polymer with a lower firing temperature should be used. In certain embodiments, the firing temperature should be in the range of 500°F to 1000°F.

[0050] As sho...

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Abstract

A light emitting diode (LED) lamp includes a base with one or more LED chips, an internal cover (16) over the LED chips, where the cover (16) is a translucent ceramic whose thermal conductivity is greater than that of glass, where the cover has an interior surface separated from the LED chips by a gap, and where an exterior surface of the cover is coated with a phosphor. The ceramic cover (16) preferably has a bulk thermal conductivity of at least 5 W / (m*K), such as polycrystalline alumina. The LED chips preferably are blue LEDs and the phosphor is selected so that the lamp emits white light. In the method of making the lamp, the phosphor may be applied to the exterior surface of the cover as a preformed sheet or in a coating.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to Provisional Application Serial No. 61 / 075,866, filed June 26, 2008, and entitled "Highly Efficient Small Form Factor LED Retrofit Lamp," which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to LED lamps with remote phosphor coatings and methods of making the lamps. Background technique [0004] The present invention is directed to a light emitting diode (LED) lamp and a method of manufacturing the same. [0005] Solid state lighting technology has begun to penetrate the white lighting market due to recent increases in the efficacy of LED devices and light sources. LED solutions can be found in applications where the LEDs can be distributed to alleviate the difficulties of thermal management, such as linear strips and down lighting solutions where the light sources are relatively large. The development of small form factor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21K7/00H01L33/00F21V7/20F21K99/00F21V29/505H01L33/50
CPCF21V3/0481H01L33/507F21K9/00F21K9/137F21V29/2231F21Y2101/02F21V7/20F21V29/505F21V29/773F21K9/233F21K9/64F21Y2115/10F21V3/12
Inventor S·C·艾伦R·S·斯皮尔
Owner OSRAM SYLVANIA INC