Compared with incandescent lamp, fluorescent lamp, white LED lamps and lanterns has small volume, long service life, fast response speed, low power consumption, environmental protection, high luminous efficiency advantages, used more and more widely in the life. But white LED lamp with long easy to deteriorate, lamp aging, lead to light color deviation, colour and lustre, affect the quality of lighting, generally in two to three years of life. In order to solve these problems, wenzhou university college of chemistry and materials engineering oujiang distinguished professor to ja, invented a new material, can make the LED lamp longevity 10 years or so, and can illuminate for a long time to make leds more widely used in high-end cars, high-speed rail, aircraft, submarines and other lighting. Recently, the reporter walked into the laboratory of professor ja, explaining the wonders what did this new material.
Extracting yellow mono-crystal, 2000 ¡æ high temperature for white LED lights last longer
To introduce professor ja, the main technology of white LED lights in the market now is to use blue chip and yellow phosphor, both combined with AB glue a white light. But this process is the main problem is that the stick of phosphor AB glue is easy to aging, especially when the light for a long time on the high temperature is easy to lose AB glue combination of phosphor effect, thereby affect the glowing effect of white LED lamp, such as the light is not bright, light blue, etc.
To break this problem, we must start from yellow phosphor. The professor ja to spend many years effort, worked out the yellow light single crystal materials, the material is under 2000 ¡æ high temperature environment production preparation, as long as in each LED a sheet of matching blue chip (such as 24 watts single light source available 5.5 mm x 5.5 mm) single crystal matching the yellow light of single crystal materials, can make the stable white light. Because of the crystal character of high temperature resistance, good thermal conductivity, can make the LED lamp is more durable, service life is longer, especially can make the light bulb will not damage caused by long time to produce the high temperature, therefore very suitable for use in premium car headlights, high-speed rail, airplane or submarine etc lighting.
Recently, the reporter in the lab to see the ja production yellow crystals of high temperature furnace and yellow crystal products, the study success for four or five years time, the current is ja and relevant enterprises to discuss cooperation. , he says, in making yellow crystal, can control the composition, concentration and thickness of the crystal, etc., bring up the different intensity of light and color temperature, meet various needs, can also be made into all kinds of length and shape of the white LED lights. To ja also developed another kind of yellow powder material replacement fluorescent yellow glass, compared with yellow crystal, yellow glass, though not so durable, but at a lower cost, shorter production cycle, the two alternative materials has reached the technical index of the market.
Break through the traditional process, the scientific research cooperation make leds made more convenient
To professor ja invented the alternative materials, not only let the white LED lamp is more durable, he also cooperate with foreign teachets, want to break through the traditional process, the manufacture of LED lighting is more simple and efficient. Now, he says, white LED lamp technology requires chips and yellow powder or yellow crystal, the combination of the two bonding needs to use AB glue, the glue is not so durable. How need not glue, to make the process more simple and he came up with a new way, "born" in yellow crystal blue chips, is to make the two merging into one, no longer need adhesive glue. At present, the technology is still in further research and development.
In addition to want to break through the traditional process, in order to make the white light LED more downy, he also developed a glowing red red crystal. He said, only the white light from the combination of yellow and blue, mostly some dazzling, if join the red light, can make the white light is more soft and comfortable. Currently, he is working on how to make yellow and red crystal, just a piece of crystal can achieve the effect of two pieces of crystal, the process needs to be further improved.
