Solid-state lighting has the advantages of energy saving and environmental protection. In the face of increasing global warming, LED or lighting manufacturers are used to persuade consumers to abandon traditional lighting and switch to the selling point of solid-state lighting. Many LED manufacturers also claim that the superiority and order status of their lighting products are good. However, as far as the current situation is concerned, there is still an insurmountable gap between solid-state lighting and traditional lighting. In short, the author speculates that the solid-state lighting market must be at least four or five years later, and its overall evaluation of price and performance is likely to be comparable to traditional lamps, and it has a real place in the lighting market.
The so-called solid-state lighting means that the light-emitting part is solid (different from the gas light of the fluorescent lamp), so the LED and the OLED (organic electric excitation photodiode) are both solid-state illumination sources. Although OLED is slower than LED, the uniformity of illumination and mass production are its advantages. When reviewing the technological progress of solid-state lighting, we should not underestimate the progress of OLED technology development.
LED technology progress
Review the technological progress of various LED and OLED manufacturers in the past year. First, let's look at the progress of the leading LED manufacturer Nichia. In September 2007, Nichia released its new LED. The experimental product has a luminous flux of 145 lm and a luminous efficiency of about 134 lm/W at a forward current of 350 mA. The chip size is 1 mm 2 and the color temperature is 4,988. K (in the case of If=20 mA, the luminous efficiency is as high as 169 lm/W).
The new product also uses white LEDs with YAG phosphors to emit white light, and the main factor for improving luminous efficiency is the improvement of the efficiency of blue LEDs. Under the conditions of If=350mA and 1A, the luminous power of the blue LEDs is improved. They are 651mW and 1.7W respectively.
In addition to white LED, Nichia has also released new blue and green LEDs. Both chips are 1mm2 in size. Under If=350mA, the luminous efficiencies of blue and green LEDs are 80lm/W and 109lm respectively. /W.
The second largest manufacturer, OSRAMOptoSemiconductors, also released its new green-light LED product in September 2007, which is 1mm2 in size. At a driving current of 1A, a luminous flux of 191 lm can be emitted with a luminous efficiency of 48 lm/W and a wavelength of 527 nm. At a driving current of 350 mA, the luminous efficiency can reach 81 lm/W and the wavelength becomes 532 nm. OSRAM's new product has improved the Droop phenomenon (the phenomenon that the luminous efficiency of LEDs with InGaN as the light-emitting layer decreases when the input current density is increased), such as blue LEDs and green LEDs, to improve the luminous efficiency. This product will be improved in the future. Application development towards LED projector light sources.
Cree, the main provider of high-power chips on the market, also released its research results in September 2007. Its new experimental product is an array of LEDs (Array), which is composed of multiple chips and its operating current. At 350mA, the total power consumption is nearly 8W, and the luminous efficiency can reach 88~95lm/W. The LED array produced by the company in July 2006 has a luminous efficiency of 79 lm/W, which shows that LED luminous efficiency has increased by 11% to 20% in one year.
1 2 3 Next Page
Capillary Pigtail,Fiber Optical,Fault Locator
Netlink Communication Equipment Co., Ltd. , http://www.gdlancable.com