2010 Global LED lighting market status and Strategy Summary

, a LED Henry Joseph in 1907 the introduction of the historical development of Round for the first time in a piece of silicon carbide in the observed electroluminescence phenomenon. Because of its dark Huang Guangtai, is not suitable for practical application; more difficult lies in the silicon carbide and electroluminescence can not be well adapted, the study was abandoned. Use of Bernhard and Robert Wichard in late for the extraction of yellow phosphorus from zinc sulfide and copper in Germany, 20s. Once again because of the dim light. In 1936, George Destiau published a report on the emission of zinc sulfide powder. With the application of the current and a wide range of understanding, the final emergence of the term "electroluminescence". In twentieth Century, the first modern was invented by British scientists in the electroluminescence experiment using semiconductor gallium arsenide, which was launched in 60s. LED. It is said that in the early experiments, LED was required to be placed in liquid nitrogen, and further operation and breakthrough were required to work efficiently at room temperature. The first commercially available LED only emits infrared light that is not visible, but is rapidly applied to the field of sensing and optoelectronics. At the end of 60s, the use of it is the invention of the first visible red light LED. gap changes in the GaAs substrate makes the LED more efficient, the red light is brighter, and even generate orange light. By the middle of 70s, gap is used as a light source, then a pale green. LED double gap chip (a red the other is green) can emit yellow light. At this point, the Russian scientists use emery to create a yellow light LED. although it is not as efficient as the European LED. But in the late 70s, it was able to emit a pure green light. The use of gallium phosphide in the early 80s to the Middle Ages led to the birth of the first generation of high brightness LED, first red, then yellow, and finally green. By early 1990s, the production of the indium aluminum gallium phosphide orange, orange, yellow and green LED. first historic blue LED also appeared in the early 90s, again using the obstacle of semiconductor light source in the early - gold grit. According to today's technical standards, it is the same as the former yellow light LED light source. In mid 90s, the GaN LED super brightness, then produce can produce high strength green and blue indium gallium nitrogen Led. super bright blue chip is the core of white LED, with fluorescence in the light emitting chip P, then p by absorbing blue light fluorescence from the re conversion chip for white. Is the use of this technology to create any visible color of light. Today in the LED market will be able to see the production of new colors, such as light green and pink. With the advancement of technology in the field of LED ultra brightness, LED is more and more widely used in consumer electronics. Two, LED classification and characteristics

A) common LED classification A, according to the luminous tube luminous color is divided into red, orange, green (and subdivided into yellow green, standard green and pure green), blue light, etc.. In addition, some LEDs contain two or three color chips. According to the light emitting diode with or without light scattering agent, colored or colorless, the various colors of light-emitting diodes can also be divided into colored transparent, colorless transparent, colored scattering and colorless scattering of four types. Light emitting diodes are not suitable for use as indicators. B, according to the characteristics of light emitting tube can be divided into round lamp, square lamp, rectangular, surface light-emitting tube, side pipe, surface mount micro tubes, etc.. According to the diameter of the circular lamp is divided into Phi 2mm, Phi 4.4mm, Phi 5mm, Phi 8mm, Phi 10mm and phi 20mm. The angular distribution of circular luminous intensity can be estimated from the angle of half value. C, from the angle of distribution of luminous intensity to be divided into three categories: high directivity. Generally, it is a pointed epoxy package, or a metal reflection cavity package, and no scattering agent. Half value angle of 5 degrees ~20 degrees or less, with high directivity, can be used as a local lighting source, or with the light detector to form an automatic detection system. Standard type. The utility model is usually used as an indicating lamp, and the half value angle is 20 DEG ~45 DEG scattering type. This is a larger viewing angle, half the value of the angle of 45 degrees ~90 degrees or greater, the larger the amount of scattering agent.

D, according to the structure of the light-emitting diode is divided into epoxy encapsulation, metal base epoxy encapsulation, ceramic base epoxy packaging and glass packaging structure.

E, according to the structure of the light-emitting diode is divided into epoxy encapsulation, metal base epoxy encapsulation, ceramic base epoxy packaging and glass packaging structure.

F, according to the light intensity and current work is divided into ordinary LED (brightness of luminous intensity is less than 10mcd); ultra high brightness LED (luminous intensity greater than 100mcd); the luminescence intensity between 10~100mcd called high brightness light-emitting diode. General LED operating current in more than a dozen mA to tens of mA, while the low current LED operating current below 2mA (brightness and the same as the ordinary light-emitting tube). B) characteristics of LED

Light emitting diode (LED) as the third generation semiconductor lighting source. This fantastic product has a lot of advantages: 1) efficientlight: spectra of almost all concentrated in the visible light frequency, the efficiency can reach above 50%. The luminous efficiency of incandescent visible light efficiency of almost only 10%-20%.) 2 high quality of light: because no ultraviolet and infrared spectrum, there is no heat, no radiation, which belongs to the typical green lighting source. 3) low energy consumption: single power generally 0.05-1W, through the cluster can be tailored to meet different