LED's main application area LED breakthrough period, that is, the birth and development of white LED, coincides with the global energy crisis is increasing, when environmental pressure is increasing, the use of LED as a lighting source is unique Energy-saving, environmental protection, safety, longevity, high reliability and other advantages, making it an important way to save energy and environmental protection in the world. Semiconductor lighting editors: semiconductor lighting, also known as LED lighting, is the use of a new generation of light-emitting diodes LED as lighting A new way of lighting. In recent years, the technology of white LED has developed rapidly. At present, its luminous efficiency has exceeded 50lm/W, the laboratory research result is 100lm/W, and the target is 200lm/W, which greatly exceeds the incandescent lamp and directly pushes the fluorescent lamp; its life can reach 5 10,000 to 100,000 hours, 50 to 100 times that of incandescent lamps; its energy saving reaches 85% of incandescent lamps. In today's global energy crisis and environmental protection pressure, the unique energy saving, environmental protection, safety, longevity and high reliability of semiconductor lighting make it popular with governments and enterprises. The world is competing to develop semiconductor lighting. In an emerging industry, a battle for the commanding heights of the semiconductor lighting industry has started around the world. As the world's largest producer and exporter of lighting appliances, the work of developing China's own semiconductor industry is in full swing, taking advantage of the once-in-a-lifetime historical opportunity. On the basis of a brief introduction to the development of LED, this paper focuses on LED lamps, which are the main application areas of white LEDs. Some examples of semiconductor lighting applications are listed to deepen our understanding of semiconductor lighting technology and introduce semiconductor lighting. The market prospects are major domestic measures for the development of semiconductor lighting. I also hope that everyone will pay attention to and promote the emerging industry of semiconductor lighting. In 1.1962, GE, Monsanto, and IBM jointly developed the semiconductor compound GaAsP, which started red light. 2. In 1965, the world's first commercial LED made of neodymium material that emits infrared light was born. Soon, Monsanto and Hewlett-Packard introduced commercial red LEDs with GaAsP materials with an efficiency of about 0.1 lm/W. 3. In 1968, the GaAsP material LED device was used to achieve an efficiency of 1 lm/W using a nitrogen doping process, and was capable of emitting red, orange, and yellow light. In 1971, GaP green chip LEDs with the same efficiency were introduced. 4. AlGaAs LEDs were developed in the early 1980s to emit red light at an efficiency of 10. lm/W. 5. In 1990, AlInGaP technology was developed with performance 10 times higher than standard GaAsP devices. Further developments in materials technology, chip size and form factor increased the luminous flux of commercial LEDs by nearly 30 times between 1991 and 2001. 6. In 1994, Japanese scientist Nakamura Shuji developed the first blue LED on a GaN substrate. 7. In the late 1990s, LEDs that produced white light by exciting YAG phosphors with blue light were developed. 8. In recent years, white LED has developed rapidly, the luminous efficiency has reached 50lm/W, the laboratory research results can reach 1001m/W, and the development goal is 200lm/W, which is close to and expected to exceed fluorescent lamps. The history of LED development The progress of aLED package form b The progress of single LED power Figure 1 The progress of LED in the form of package and power Electronic production of PRACTICALELECTRONICS and people are full of expectations for white LED. The market demand has promoted the rapid development of LED, and the long-term development of LED has continuously broadened the application range of LED. Let's take a look at the main application areas of LEDs, and focus on the application of LEDs in lighting. 1. Signals indicate functional indications, traffic lights, etc. for all electronic devices. 2. Display application signs, billboards, large screen displays, etc. 3. Lighting applications (1) flashlights, headlights, miner's lamps, diving lights, traffic lights, etc. (2) Automotive lights: high brake lights, brake lights, turn signals, reversing lights, side lights, fog lights, interior lights, headlights, etc. (3) Special lighting: solar garden lights, solar street lights, solar beacon lights, night light, table lamps, spotlights, interior decorative lights, wall washers, window lights, lights, landscape lights, barrier lights, buried lights, floor lamps , underwater lights, etc. In various commercial places, LED lighting has great advantages, such as: medium and high-end specialty stores, shopping malls and other indoor commercial atmosphere lighting: LED light source energy saving and environmental protection, its full spectrum color range is very suitable for the atmosphere of specialty stores and shopping malls Its advantages in local lighting, accent lighting and regional lighting can create a high-quality light environment unmatched by traditional lighting sources, which is very suitable for commercial lighting. Entertainment venues, beauty salon lighting: LED integrated light source features are easy to control, can create static and dynamic lighting effects, from white light to the full spectrum of any color to create a strong entertainment atmosphere. Atmosphere lighting in bars, cafes, etc.: LED light source is small in size, can produce different styles of LED lamps, and its full spectrum of arbitrary colors and dynamic and static lighting effects will be fully decorated with decorative and mood. Lighting in professional places such as museums and art galleries: places such as museums and art galleries have high requirements for lighting environment. The special features of the displayed items require that the lighting source does not contain ultraviolet light and no heat radiation. LED is a cold light source, does not contain ultraviolet light, and can fully meet the special requirements of lighting in museums and art galleries. Stage lighting in theater, TV studio dance and photography: British TV and GMTV changed the studio lighting to color-changing LEDs, reducing energy consumption by more than 60% in the lighting and making the studio more comfortable. Hotel, hotel, hotel lighting: hotels, hotels use LED products, in addition to energy saving, but also show warmth. Conference room, multi-function hall lighting: Intelligent control of the LED grayscale can be adjusted, can adjust the lighting environment of the conference room or multi-function hall to meet the needs of different conference themes for the light environment. Exhibitions, fashion show lighting: For businesses, a personalized light environment is needed to showcase their products and services, and LEDs are useful in exhibitions and fashion show lighting. Living room and home theater lighting: LED lighting color can be used to create a warm, harmonious, wave-temperature atmosphere, reflecting the comfortable and casual atmosphere. Mass transportation lighting: luminaires for aircraft, buses, MRT, high-speed rail and other transportation vehicles, LED lighting can greatly reduce operating and maintenance costs, and LED light source has directionality, will not affect passengers in other seats, do reading lights, Situation lights and the like are quite suitable. Both the Airbus A380 and the Japanese Shinkansen vehicles use LED luminaires.
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September 07, 2019