Improved LED thermal performance

LED's use of the survival of the relevant period, for example, use silica ceramic packaging materials and packaging materials, ceramics, make use of LED growth in a number of years of survival, especially in white LED flash spectrum, including wavelengths below 450nm short wavelength light, ring oxygen of traditional packaging materials, natural resins can easily be short wavelength light damage, a large high-power white LED light intensity is more accelerated deterioration of packaging materials, according to industry tests revealed the final results of reelection than 10,000 hours of lighting, high power white LED brightness has been reduced half or more, there is no way satisfied with the lighting source

LED display lighting products, small size, light weight, portable, battery-powered, high cost performance characteristics, to visualize, is a very simple and easy to use testing tools, product moisture after shock treatment, can be harsh environments in the wild under a long time. [Full Text]

Long live the basic requirements of life. Until now, there are two components used to extend the survival period of the response, unless that restriction temperature white LED groups, and ending the use of natural resin package.

But, in fact, the hair high-power LED Power LED with high calories than a small number of more than ten times, and also make the flash rate of temperature rise sharply. Unless a specific internal substantive: to reduce the chip to the package thermal resistance, which restricts package to the printed circuit board thermal resistance, an increase of the chip's heat well patency.

Try to detract from thermal resistance, improved heat dissipation

Related LED flash rate to improve the structure and the chip package structure, can achieve the same level of low-power white LED. In view of the United States and Japan CITIZEN such as Lumileds lighting, LED packaging manufacturer, a research and development followed by a cooling of high power LED technology with a simple, CITIZEN started in 2004 and started production of white LED sample package, do not have to be particularly thick with technology 2 ~ 3mm calories heat sink directly discharged into the outside, of course, based on the LED chip CITIZEN reports point to the cooling device with 30K / W thermal resistance than the OSRAM's 9K / W large, and in the general context of 1W at room temperature will increase the thermal resistance so, even though the traditional printed circuit board without the cooling fan forced air-cooling conditions, the white LED lighting plate can also be used reelected.

Related to the nature of particular average of the flash, the general feel as long as the improvement of white LED phosphor average concentration of liquid material and phosphor manufacturing technology, should be able to overcome the above mentioned siege and disquiet.

Hand, because of the increased power will lead to rapid down package thermal impedance 10K / W below, because the overseas development of the industry before the high temperature white LED, intended to improve the above mentioned problems.

While silicon LED packaging materials to ensure the survival of the 40,000 hours of use of the number of years, but the lighting in the industry have revealed a different view, the main argument is the traditional use of fluorescent light bulbs and the survival period, is defined as "the brightness down to 30 The following one hundred percent. " Brightness half-time for the forty hours of LED, if converted into the brightness down to 30 one hundred percent in the following words, only about twenty hours or so.