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Lighting energy-saving and environmental protection issues more and more attention has been vigorously promoting the use of LED lights


Light-emitting diode (LED) chip luminous efficiency rising, making the high power white LED light source gradually being accepted as a solid-state lighting, lighting technology progress and development to improve the quality of lighting, to enhance lighting technology, the lighting economically reasonable, safe to use, energy conservation, environmental protection, international and domestic lighting engineering industry is vigorously research and development and technological issues. 1996 Nichia white LED commercialization, it is a combination of blue LED chip and a yellow phosphor doped Ce3. White LED display and signal indication plays an important role, such as LED displays, car lights and traffic lights.

Lighting energy-saving and environmental protection issues, more and more attention has been vigorously promoting the use of LED lights. LED light source has no flash, low energy consumption, impact resistance, environmental protection, long life and other prominent feature. Therefore, various countries and regions competing to invest in R & D white LED light source. However, the power LED lighting with there are many problems need to be addressed: white LED commonly used blue LED excitation of yellow phosphor white synthetic, there is the problem of low color rendering index of package high color temperature LED lights. As the light source for illumination brightness light source than the display, white LED power to be as large as possible, in the high current work, however, increasing with length, LED light failure, plus phosphor and packaging material deterioration cause luminous flux decline. With the significant increase of the power, the heat production of the PN junction is also greatly increased, while in this part of the heat will directly affect the working temperature of the LED, the light emitting efficiency, the emission spectrum, the reliability of the performance of the service life. By adjusting the ratio of phosphor and silica gel dispensing volume and control of the amount of thermal paste, the choice of packaging materials, light distribution curve design and improvement of power conversion efficiency, to improve the performance of high-power white LED products. Many researchers have done a lot of research on the performance of the LED chip, but little research on commercially available high-power white LED lamp characteristics. This paper studies the impact of the change in temperature of the different packaging materials on the electrical characteristics of the high power white LED lamp light color.

Experimental procedure

In this study, the object of study of 3W high power white LED lights. The device contains: (1) Taiwan Epistar Corporation production 1W blue chip (Specifications: 45 × 45mil); (2) Dow Corning silicone; (3) PC material hemispherical the hollow lens; (4) copper substrate (Model: copper T1) and aluminum plate (Model: aluminum 6063l); (5) cylindrical aluminum radiator (size: diameter of 30 mm × H47mm; 45mm × H54mm); (6) doped Ce3 yttrium aluminum garnet (YAG) phosphor.

First, the use of automatic wire bonders are welded aluminum plate and copper substrate 3 chip (was the “product” type arranged in series), the silicone coating on welded chip, curing. And then silica gel with the YAG phosphor mixed in a certain proportion, stirred for 10 minutes After 30 minutes vacuum applied in on good curing silicone, wherein the curing conditions are 150 ° C, baking 1h. Then, the substrate is mounted on the radiator, coated thermal paste in the middle. The lens and the cover glass is mounted on the phosphor layer can be used to control the distribution of light and prevents glare. When driven with a constant current source, the chip emits blue light excitation phosphor Finally, the uniform white light through the lens and glass.

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