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LED The Development Of
Jun 01, 2018

For general lighting, people need white light source more. White LED on in 1998

Send a success. The LED is made from GaN chips and yttrium aluminum garnet (YAG). The high-temperature sintered YAG phosphor containing Ce3+ was excited by the blue light of GaN chip (465nm, Wd=30nm), which emitted yellow light emission with a peak value of 550nm. The blue-ray LED substrate is installed in a bowl-shaped reflecting chamber and covered with a thin layer of resin mixed with YAG, about 200-500nm. The blue light from the LED substrate is partly absorbed by the phosphor, and the other part is mixed with the yellow light from the phosphor to get white light. For InGaN/YAG white LED, color white light of color temperature 3500-10000k can be obtained by changing the chemical composition of YAG phosphor and adjusting the thickness of the phosphor layer.

Blue-ray LED technology, in a nutshell, is a more energy efficient way to generate light, but it can also be applied to camera, mobile phone and other technology products. The lighting equipment made with blue light LED technology is more energy efficient and greatly reduces the energy consumption of the earth. According to existing data, 25 percent of the world's electricity is used for lighting, and after the use of LED lights, the power used for lighting is reduced to 4 percent, which undoubtedly changes the whole world.

From the discovery of LED effect in 1907 to the official invention of LED by xiuer nakamura in 1993, to the commercial use of 1W LED lamp in 1999, LED has experienced a development of nearly 100 years. Before that, people had been using the incandescent light bulb invented by Edison in the last century, and the incandescent light bulb wasted most of its energy on heating, and about 90 percent of its electricity was wasted.

The emergence of LED lamps and lanterns, needed to significantly reduce lighting electricity, the same wattage of LED lights, the required power only 1/10 of incandescent bulbs, LED at the same time has the advantages of long service life, environmental protection, free maintenance, quickly replace the position of the incandescent light bulb. In 2012, the Chinese government announced a total ban on the sale and import of incandescent bulbs for ordinary lighting products with more than 100 watts.

As noted in the Nobel Prize for physics: "incandescent bulbs illuminate the 20th century, LED lights illuminate the 21st." [4]

advantage

1. High efficiency and energy-saving

Only a few degrees of electricity is consumed in 1000 hours (the average 60W incandescent lamp consumes 1 degree of electricity in 17 hours, the average 10W energy-saving lamp consumes 1 degree of electricity in 100 hours)

2. Long life

Semiconductor chips, no filament, no glass bulb, not afraid of vibration, invulnerability to breakage and service life of up to fifty thousand hours (the service life of the ordinary incandescent lamp only one thousand hours, the service life of the ordinary energy-saving lamps, only eight thousand hours)

3, good health,

Healthy light does not contain ultraviolet or infrared rays and does not emit radiation (uv and infrared rays are found in ordinary light lines).

4. Environmental protection:

It does not contain harmful elements such as mercury and xenon, which is conducive to recovery and does not cause electromagnetic interference (common lamp contains mercury, lead and other elements, and electronic ballasts in energy-saving lamps generate electromagnetic interference).

5. Vision protection

Dc drive, no strobe (common lamps are ac drive, so there must be strobe)

6. High optical efficiency

Less than 10% of the energy from heating is converted to visible light (95% of the energy from an incandescent lamp is converted to heat, and only 5% is converted to light).

7. High safety factor

The required voltage and current are small, and the heating temperature is small

8. Great market potential

Low voltage, dc power supply, battery, solar power supply, in remote mountainous areas and outdoor lighting, etc.

contrast

1. Under ac drive, LED lamps will have stroboscopic phenomena just like incandescent lamps, while conventional energy-saving lamps have no stroboscopic phenomena. Strobe makes eyes tired easily.

2. If the light of each LED bulb is too bright, it will strongly stimulate the eyes and cannot be directly seen, even for a short time, while the ordinary energy-saving lamp is relatively softer.

3, illuminate Angle has a limit, normally only illuminate is 120 °, and ordinary energy-saving lamps to illuminate almost 360 °.

4. The luminosity of the irradiated room is no better than that of the energy-saving lamp, because the led only has high luminance in the narrow Angle of direct vision, and the light decreases rapidly when the Angle deviates from it.

Therefore, LED energy-saving lamps for indoor lighting lamps and lanterns of advantages than ordinary energy-saving lamps not necessarily obvious, but as a flashlight, desk lamp, lamp and so on need to light the lamps and lanterns of narrow Angle when using is very good.

The choose and buy

1. LED brightness (MCD) is different and price is different. Used for led lamps and lanterns, the led should comply with the laser level Ⅰ class standard.

2. LED with strong resistance to static electricity, long service life and high price. Usually electrostatic resistance is greater than

The 700V LED can be used for LED lighting.

3. LED with the same wavelength has the same color. If the required color is the same, the price is high. It is difficult for manufacturers without LED color separators to produce products with pure colors.

4. LED with leakage current is a unidirectional conductive luminescent body. If there is reverse current, it is called LED with leakage current. LED with large leakage current has a short life and low price.

5. LED with different luminous Angle USES has different luminous Angle. Special luminous Angle, high price. If all diffuse Angle, the price is higher.

The key to different qualities of life is life, which is determined by light decay. Light fading, long life, long life, high price.

7. The luminescent body of chip LED is a wafer, and the price varies greatly with different chips. Chips are more expensive in Japan and the United States. Generally, chips from Taiwan and China are cheaper than those from Japan and the United States.

8. The size of the chip is expressed by the side length, and the quality of large chip LED is better than that of small chip. The price is proportional to the chip size.

9. The colloid of ordinary LED is generally epoxy resin. LED with anti-ultraviolet and fireproofing agent is more expensive. High-quality outdoor LED lighting should be anti-ultraviolet and fireproof. Each product can have different design, different design suitable for different purposes, the reliability of the LED lighting design aspects include: electrical safety, fire safety, environmental safety, mechanical safety, health and safety, security, time and other factors. From the perspective of electrical safety, relevant international and national standards should be met.