Shao Jiaping: the future of LED occupies a major position in landscape lighting

Editor's note: Beijing Olympic Games is a sports event is also a LED event. In the Olympic Games, the large-scale application of LED products and landscape lighting display magnificent effect, let people really know her charm. Although the Beijing Olympic Games to the LED industry has brought opportunities, but LED in the development of landscape lighting problems can not be ignored. China semiconductor lighting network reporter on the LED landscape lighting a lot of hot interviews with Shanghai CREE photoelectric Development Co., Ltd. technical director Dr. Shao Jiaping. Reporter: in the whole Olympic lighting project, the national enterprises to obtain a hitherto unknown breakthrough in the lighting project to stir up the burden, what is the advantage to let CREE photoelectric talent shows itself eventually win the championship?

Dr. Shao Jiaping: CREE (NASDAQ: CREE) the company has twenty years of history, is the Chinese accounted for the largest shareholder of the international well-known company, is the world's III/V compound semiconductor materials, epitaxy, chip and package famous manufacturers and industry leaders. In early 2008, after the successful acquisition of the U.S. LED Lighting Fixtures (LLF), complete the integration of a complete set of industrial chain from chip, package to lighting solutions. In the Beijing Olympic Games, CREE's LED application in the water cube, the bird's nest and other Olympic venues. In short, CREE's LED products are mainly has the following advantages: LED: the properties of high quality and high efficiency: LED devices, CREE has been able to mass production of high-power white 100lm/W devices provide more than 350 mA @. LED chips, high power EZ1000 chip external quantum efficiency of up to 38% (0.98mm*0.98mm), while the small power TR260 chip quantum efficiency has reached more than 50% (0.26mm*0.48mm), the technology level in the world.

High reliability: a case study of high power white LED devices. Light and color drift has been two major obstacles to the application of LED in the field of lighting. These two points is precisely the two major advantages of CREE. At present we have made experimental attenuation more than 18 thousand hours, calculated according to ASSIST method, if the LED junction temperature control at 80 degrees Celsius, LED in 50 thousand hours after the initial flux can keep 70% (see Figure 1). Such excellent performance is mainly due to CREE's unique heat treatment technology, the device can successfully control the thermal resistance at 8 /W. In addition, CREE through the improvement of phosphor technology, successfully solved the phenomenon of LED color drift. As shown in Figure 2, after thousands of hours, the color coordinates of the range of positive and negative deviation is less than 0.004.

2, the complete product line

The CREE series is complete, including outdoor display and the information column Round & Oval round and oval lamp lamp, SMD3in1 device for indoor display, decorative RGB high brightness (HB) and high power HP devices, and high power road and stadium lighting with white power (HP) light, almost covers the application of all types of LED.

3, the advantages of patented technology

As the first CREE grown on SiC substrates GaN blue chip company itself has 825 U.S. patents (including the application and the application) and 1800 (including a number of patents and has applied in the application, in addition) after the signing of cross licensing with Nichia and TG, is to lay a solid foundation for a patent no worries. In this year's "337" bill, Sony, LG and other companies involved. The CREE is one of the few manufacturers not listed in the list of defendants. The Olympic Games is a global sports event, the display of the 08 Olympic venues, but also to the people of the world to show the national image and national comprehensive strength of an opportunity. Choice of LED companies without patent barriers is an inevitable choice.

Reporter: with your long hours in the industry lighting planning and design experience, do you think the current LED landscape lighting industry in a state of creative design?

Dr. Shao Jiaping: there is no doubt that Beijing Olympic Games is a model of high brightness, high power LED successful application, the opening ceremony is almost LED fantastic stage show, countdown to the Olympic rings, pottery, bird's nest picture, most incisive display of LED technology. This large-scale use of LED and semiconductor lighting technology and products, is not only an important breakthrough in the history of the Olympic Games, but also deeply fit energy-saving emission reduction, green environmental protection needs of the times. Not only that, through the Olympic Games to the broad masses of people to LED also have the deep step to understand, many cities also launched the project promotion LED, currently Shanghai, Xiamen, Beijing, Dalian, Nanchang and other large and medium-sized city landscape lighting has a considerable scale, completed a considerable part of the LED lighting demonstration project. The successful completion of these demonstration projects in large and medium cities, coupled with the success of the opening ceremony of the Olympic Games, led the further development of LED lighting products in county-level cities. It can be said that the entire development direction of the LED landscape lighting industry is still relatively good.

But it is undeniable that there are some problems in the overall design: first, seeking quality not quantity: the common pursuit of more bright, Fangyanwangqu, Mancheng lighting are all LED in the shining, light pollution is more serious, how to give people a sense of beauty, but also the real environmental protection and energy saving effect of lighting comfort, but also the industry needs designers need to think more.

Two, for the price and quality: many designers often on the LED device performance is not enough to know, only bright and price pursuit in the choice of LED, the reliability of LED is often not enough attention, dead lights, attenuation of the situation is more serious, leading to the lighting project after the completion of the "some just a flash in the pan", can not afford the time test. Is a departure from the original intention of energy-saving emission reduction.

Reporter: LED lighting development prospects, there are still those major technology