Tube Mini
Tube Mini
Ramond: Consumer Products LED Tube
A. LED tube , light emitting structure and the principle, Led tube consists of an LED. For 50 years, people have to understand the semiconductor material that can produce light of knowledge Basically, the first commercial production of LED in 1960. English LED light emitting diode (LED), the symbol and basic structure is a semiconductor material electroluminescent located on a wire rack, then surrounded by epoxy sealed, can protect the base effect of the inner wire, so that the seismic behavior of the LED. light LED tube-emitting diode based on the P-type semiconductor and n-type semiconductor chip is formed in the p-type semiconductor n-type semiconductor between a transition layer called the pn junction. In certain semiconductor materials, PN junction, minority carrier injection and recombination of majority carriers, when excess energy released as light to convert light energy into electrical energy. pn junction reverse voltage, the injection of minority carriers is difficult, not light. The use of injection electroluminescent diodes called the principle of making light emitting diodes, commonly known as LEDs. When you are in a position when a positive run (which ends with a positive voltage), current from the anode to the cathode of the LED, semiconductor crystals for the realization of different colors from the ultraviolet to infrared light, the intensity of light and current.
B. Features LED tube light source
1. Voltage: tube LED low voltage power supply, power supply of 6-24V, according to the products vary, so it is safer than the use of voltage source especially for public places.
2. Yield: led tube light consumes energy efficient than incandescent lamps, with 80% discount
3. LED tube application for home lighting, commercial lighting, and elsewhere.
4. Stability: 10 million hours, the light fades to 50% of the initial
5. Response time: response time of milliseconds incandescent lights, LED tube nanosecond response time
6. LED tube pollution environment: not harmful metallic mercury
7.LED tube color: change the current can change color, light emitting diodes by chemical modification methods to easily adjust the structure of the material of the band gap, to achieve multi-color light orange red Huanglv Lan. As the small stream when the red LED, as current increases, you can turn orange, yellow, and finally to green
8. Price: LED tube is expensive, compared to incandescent lamps, the price of a few LEDs to the price of incandescent lamps with a considerable and often each signal to be 300 to 500 the diode in the form.
C.monochromatic LED and the history of the types of
The first application of the principle of the semiconductor pn junction LED light source made of 60 came in the 20th century. The use at the time that the material is GaAsP, fat red (λp = 650 nm), the drive current of 20 mA, the luminous flux is only a few lumens per thousand, and the luminous efficiency for about 0.1 lumens per watt. In the mid 70's, the introduction of elements of A and N, the green LED produces (λp = 555nm), yellow (λp = 590nm) and orange (λp = 610nm), the luminous efficiency is also increased to one lumen per watt. By the early 80's, there GaAlAs LED light source, so red-efficient LED light of 10 lumens per watt. Early 90's, the red light, yellow light GaAlInP green hair and blue GaInN the successful development of two new materials for effect LED light has been greatly improved. In 2000, the first is made of LED in the area of orange-red (λp = 615nm) of the luminous efficacy of 100 lm / W, which made the green LED (λp = 530nm) light efficiency can reach 50 lm / W.
D. The application of monochromatic LED tube
Instrumentation for the first LED light source direction, then a variety of colored LED lights and large screen has been widely used and produced good profits economic and social. red lights 12 "Traffic, for example, is used in the U.S. states that have long life, low efficiency of the incandescent lamp 140-watt light source that produces 2,000 lumens of white light. The red filter, 90% loss of light, only 200 lumens of red light. In light of the new design Lumileds has used a light source red LED 18, including circuit losses, including a total power of 14 watts of light to produce the same effect.
Automotive LED lights are also important areas of application of light. In 1987, China began to install in the car brake light, the LED response speed (ns) at an early stage so that the final vehicle drivers know that driving conditions and reduce rear-end accidents.
In addition, lights outdoor red, green screen, blue, full color, golf mini flashlight key chain type have been applied.
E. The development of white LED tube
For the purposes of general lighting, people need a white light. 1998 LED glowing developed. This is the GaN LED chip yttrium aluminum garnet (YAG) packaged together to do. GaN blue chip fat (λp = 465nm, Wd = 30 nm) made of high temperature sintering of YAG phosphors with Ce3 + excited by this yellow emission blue light of 550 nm peak. Substrate cavity blue LED installed in the cooling container, covered with a thin layer of resin mixed with YAG, around 200-500nm. part of blue LED substrate to be published absorbed by the phosphor, and a little blue and yellow light emitted white phosphorus mixture can be too. Now, for the InGaN / YAG white LED, YAG phosphor, changing the chemical composition and adjust the thickness of the phosphor layer that can get the color temperature of 3500 10000k white. The first has been the marketing of products for blue chip YAG yellow phosphor, the luminous efficiency of their top 25 lm / W, YAG and more from Asia to the prices companies Japanese import in 2000 yuan / kg; The second is the Japanese Sumitomo Electric has developed the material ZnSe white LEDs, but less luminous efficiency. It can be seen in the table, some types of white LED light source can not do without four of phosphorus: the earth three primary colors red, green, blue garnet structure of pink and yellow and pink, in a brighter future is the light of three wavelengths, which is inorganic UV chip and three RGB color phosphors, white light LED for the package is scheduled for This year, three-wavelength white LED drive marketing opportunities. But here trichromatic match requirements of particle size are relatively small, the stability criteria are also high-applications, are being explored specific.
F. Industrial Information general
In the Nichia LED tube industry was the first use of process technology developed different wavelengths of the LED's high brightness, and blue-violet laser semiconductor (diode laser LD) is the industry heavyweight blue LED patent industry. Nichia achieved in the production of blue LED and electrode structure, and many other basic patent, attach to not give permission, only his own production strategy, the intention of monopolizing the market, making the blue LED high prices. However, others already have substantial production capacity in the industry disagree, some Japanese LED industry believes that the strategy Nichia Chemical is to make the tube Japanese blue and white LED in the competition, gradually Europe America and other countries to take the lead LED industry, industry Japanese LED together can cause serious injury. So many companies make every effort to carry out the development of blue LED production. Currently, except chemistry and Sumitomo Electric Asia, Toyoda Gosei, Mu Luo, Toshiba and Sharp, American Cree, 3 large plants in the world unique lighting, Philips, Panasonic and HP Siemens, Research, EMCORE invested for the production of product development, promotion of the industrialization of white LED products, the market has played a positive role.
About the Author
Ramond , is one of the expert of the led tube products and other led products .
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