US 20080272386, filed by US LED manufacturer Cree to the US Patent and Trademark Office (USPTO), was published in November, using laser stripping or cutting (laserablationorsawing) technology to directly inscribe grooves on silicon carbide (SiC) substrates ( Trenches), using a spin coating method to fill a recessed semiconductor nanocrystal or phosphor into a groove, forming a convex bridge between the grooves, this method can make white LEDs more filial and easier to manufacture.
These fluorescent fillers convert the narrow-band blue light emitted by the GaN LED on the SiC substrate into a broadband white light. The patent inventor Peter Andrews pointed out that etching a groove on a substrate is a major advance compared to the current technology of placing an LED in a submount and encapsulating it with a light-converting material, as the former limits white LEDs. The smallest size. To help the light get out of the LED, the manufacturer will change the shape of the pedestal and increase its reflectivity, while Cree's groove design also has the effect of increasing the light extraction rate.
Andrews pointed out that in addition to the phosphors used in traditional LEDs, the introduction of semiconductor nanocrystallites such as cadmium selenide (CdSe) into the grooves also helps to control the wavelength of the light. Cree recommends replacing these common spin-coating methods with inkjet (inkjet), screenprinting and airbrush applications to fill such grooves.
Despite the use of new wavelength conversion materials and increased groove design, LED bare crystals retain the traditional standard electrode structure, so they can continue to be packaged into LEDs, or used directly, such as directly on a board or substrate for application. .
Cree announced in November that the 1mm1mm high-power white LEDs have a luminous efficiency of up to 161lm/W. For this new record, Cree says this is the result of improved die and packaging technology. The company said that they are about to produce such a record-leading LED, will continue to introduce innovative technology in the production process, and it is expected to begin mass production of this high-performance LED within one year.
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