外文翻譯---大功率白光led封裝工藝技術(shù)與研制(已修改)
2025-01-30 00:00 本頁(yè)面
【正文】 附錄A Researchamp。Fabrication of Packaging Technology for High Power White LEDComparing with the traditional incandescent and fluorescent lighting, the high Power white LED has many significant inparable advantages such as energy saving, envirorunental protection, long life and so on. It represents the development direction of green lighting, and is moving into the field of lighting rapidly. From the packaging technology of 1 W highbower white LED, the cost and performance of several methods were analyzed and pared for white light LED. Based on this, using the“blue chipamp。YAG phosphor for producing white light LED is the final selection with its good perfounance and proper price. The results show that in improving the light emitting efficiency, unilounity and stability of highpower white LED, it needs further development of new materials and new technology.IntroductionLED use semiconductor chips of solid as light emitting materials, the use of electric lightemitting. As a light source, LED39。s advantages is in energy saving, environmental protection and longlived three aspects. LED does not depend on heating filament to lightemitting, energy conversion efficiency is very high, in theory only 10% of the energy consumption of incandescent. pared with fluorescent, LED can be up to 50% of the energy saving effect. Special survey showed that the annual electricity consumption of China39。s lighting is more than 300 billion, to replace all incandescent lamps with LED or in part or to replace the fluorescent lamp, can save 1 / 3 of the lighting electricity, means that the saving of 1 000 billion kwh, representing the fullyear39。s generating capacity of Three Gorges Project which investment of more than 200 billion. Using LED to replace fluorescent lamps, bamboo lamps to avoid the breakdown of a spill of mercury pollution, moreover waste and manufacturing backplane LED (Copper Clad Aluminum) reuse can be recycled. LED by solid package, the structure is deepset , life expectancy can be up to h. In addition, LED also has a low operating voltage, power consumption in small, high luminous efficiency, response time is very short (nsgrade), pure light color, light weight, small size, such as a series of characteristics of rapid development, especially highpower highbrightness white light LED of the invention, by the insider as the lighting the area of the third revolution.following make fire lighting, after Edison invented the lamp .White LED production methodAt present, the way to product white light with LED chips show in the table1. Preparation principle of“blue chipamp。YAG phosphorThe way of The white light production methodAdvantagesDisadvantagesCaN single grain Blue light LED +fluorescent materialSingle grain production method, low cost, electronic circuit, designed is simpleLuminous efficiency is low。 of poor color。 fluorescent material is not easy to find。 limited phosphor coating, so thewhite light is not evenUV LED (375nm) + fluorescent materialPhosphor material is not easy to find, will enable the conversion efficiency higher than the YAG fluorescent material, lightemitting efficiency of space。 good colorLuminous efficiency is low。 packaging materials are easy to produce ultraviolet by UV light 。 limited phosphor coating, so thewhite light is not evenZnSe single grainBlue LED + ZnSe substrate Single grain product white light, low cost。 low drive voltage ()。 without the use of phosphorLuminous efficiency is 50% lower than CaN, about 8lM / W。 short life, only 8000hDualwave single grainwhi
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