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As a new kind of semiconductor photoelectric device, Light-emitting diodes (LEDs) have begun to play an important role in many illumination applications due to their excellent performance in terms of high brightness, energy-saving and environment friendly. However, thermal management is one of the major issues to be improved for implementing LEDs into illumination applications because heat affects...
LED with many advantages such as high brightness, long-lifetime, and energy-saving has been successfully applied to various fields, especially on special lighting applications. At low temperatures, LED is more uniform in illumination and has a higher luminous efficiency, which is regarded as the next generation refrigeration system lighting. As well as in some cold regions, LED has also become the...
The degradation of high power white and blue light-emitting diodes (LEDs) was investigated by considering the electrical, optical and phosphor conversion. The LED samples were tested at the elevated temperature of 40°C with 700mA, 900mA, 1200mA. In order to research the degradation rule of fluorescent power in white LED, aging studies using white and blue LEDs with same batch of chips under same invariableness...
LED lighting becomes the forth generation green lighting. However, in terms of LED development and large-scale application, the reliability of LED has become one of the technical bottlenecks. This paper carried out the research on the thermal-humidity reliability of high power LED module by the means of experiment and simulation, which mainly aims at the reliability problems existed in high power...
LED lighting is referenced as the forth generation green lighting with the great advantages of low power consumption, high luminous efficiency and long service life. Thermal management is one of the most important aspects of successful LED systems design. In this paper, a novel packaging structure for high power multi-chip LED was proposed and investigated. Firstly, Chip on Board (COB) technology...
As the fourth-generation lighting, LED attracts a lot of public attention with the advantages of high luminous efficiency, energy-efficiency, environment protection and long lifetime. Stress is one of the most important reasons in affecting high power LED (HP-LED) reliability and lifetime. The stress may be generated from heat, current or humidity, and has bad influence on LED reliability. In this...
According to Solid-State Lighting Manufacturing Roadmap 2009, lower cost and higher reliability are two key necessities for LED lighting. In this paper, an optimization process of thermal design for LED lighting system is carried out from the perspective of system in packaging. Based on the three-dimensional thermo-mechanical model of LED lighting system, the thermal and mechanical performance of...
Nowadays LEDs (Light Emitting Diodes) are widely used in many fields. As the fourth generation of lighting sources, LEDs have the advantages of long lifetime, power saving and environment-friendly. In this paper, the thermal variation characteristic of some parameters for two high-power LEDs packaging modules, such as forward voltage, luminous flux, CCT and luminous efficiency, were analyzed experimentally...
Light emitting diode (LED) as the new light source has the advantages of power saving, environment-friendly, long lifetime and no pollution compared with fluorescent and incandescent lights. But the disadvantage of LED is low light lumen that only 10%~20% input power transform into the light, and 80%~90% into the heat. The junction temperature of LED is so high as to induce the lifetime declining...
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