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Using a two-dimensional thermal flow model, we calculate the thermal resistance and the temperature distribution of InGaAsP/InP multi-quantum-well superluminescent diodes. The influence of lateral chip size and composition are evaluated. The results reveal that when the injection power reaches 1 W, temperatures in the active region rises up to almost 5OK. The width and length of the chip also have strong influence on the thermal resistance that can reach two orders of magnitude. The thermal resistance will change from 290 K/W to 68 K/W when the chip width increases from 500μm to 2500μm, and a similar result exists for the length. There is small effect on thermal resistance for active width. In view of the characteristics of output power versus the input current under pulsed and continues currents, the fitted experimental thermal resistance matches well with the measured results. 相似文献
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硅酸盐单基质白光LED荧光体的制备和光谱性质 总被引:4,自引:3,他引:1
用喷雾热解溶胶凝胶方法制备了平均粒径为4.45μm大小的同一基质Ba3MgSi2O8:Eu2+,Mn2+三色发射合成白光的LED荧光体,研究了掺杂铝离子对荧光体的微结构和发射光谱的影响。实验发现,在375nm的激发下,红绿蓝(RGB)三种颜色峰的位置分别是608,500,437nm。微量Al离子的掺入会使荧光粉蓝光和绿光的相对强度发生明显变化,而红光的强度基本不变。因此,荧光体的色坐标位置可以通过掺入不同数量的铝离子来调控。从微结构机制上讨论了铝离子对基质离子的配位、格位和能量状况、发射光谱影响的内在规律。该稀土硅酸盐基质表现出的RGB三色发射特征,可成为重要的新型白光荧光体材料。 相似文献
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1 引言 初学大学物理的学生们大多苦于如何把已学过的高等数学与物理问题联系起来,结果造成了理论不能与实际相结合的现象.本文用求解万有引力大小的三个例子说明高等数学中微元的概念在物理中的应用,希望能起到抛砖引玉的作用. 相似文献
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