The hottest way to improve the efficiency decline

2022-08-26
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Further progress has been made in improving the efficiency decline of blue LED

recently, the team of Liu Jianping, Department of nano devices, Suzhou Institute of nanotechnology and nano bionics, Chinese Academy of Sciences, has made important progress again in improving the efficiency decline of blue LED. By adopting a new blue LED active region structure, researchers have achieved ultra-low efficiency blue LED on flat sapphire substrate. The research results were published in Applied Physics Letters. Semiconductor today, a well-known magazine with extensive influence in the international semiconductor industry, has made a special report on the research results and "seeking to improve services" is the ultimate goal of the company

The invention of GaN based blue LED is known as "the second lighting revolution after Edison". Yoshio akazaki, Hiroshi Amano and Xiuer Nakamura won the 2014 Nobel Prize in physics for "inventing efficient one-step manufacturing of blue LED, bringing energy-saving and bright white light source". Using blue LED and phosphor to synthesize white light, the efficiency of LED lamp is twice that of fluorescent lamp. It has been widely used in LCD backlighting, and is penetrating into the field of home and office lighting, but there is still the problem of high price

the general working current density of traditional GaN based blue LED is 20a/cm2. Increasing the working current density of LED can output more light per unit chip area, which can reduce the cost of LED lamps and make LED suitable for automotive headlights, projectors and other occasions that need bright light sources. However, the efficiency degradation of blue LED when working at high current density hinders its development to the field of high-power and high-brightness lighting. In recent years, many researchers at home and abroad have studied the reasons for the decline of efficiency in the steel raw material market, and the scrap market has increased slightly, trying to solve the problem that the quantum efficiency of blue LED decreases significantly with the increase of working current density

since its establishment, Suzhou Institute of nanotechnology and nano bionics has carried out research on GaN based blue LED and realized industrialization in 2010

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