Impact of microstructures by femtosecond laser direct writing on the LED efficiency

Impact of microstructures by femtosecond laser direct writing on the LED efficiency
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飞秒激光直写微结构对LED效率的影响

DOI:
10.1080/09500340.2014.950620
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发表时间:
2014-10
影响因子:
1.3
通讯作者:
Liu, Yang
Liu, Yang
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Wei, Xin;Wang, Qiang;Li, Min;Liu, Yang

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本文报道了利用飞秒激光直接写入技术在LED芯片表面制备微结构的方法。研究了LED光提取效率随激光功率和脉冲的变化趋势。研究发现,在制造LED表面微结构时,有一个最佳的表面处理条件(激光功率和脉冲数)可以使LED光通量达到最大。在本实验中,当激光功率为0.48 μW,点间距为5 μm,单点三个激光脉冲时,LED的发光效率接近于最佳增强值。在此条件下,可提高23.53%。
We report on fabricating microstructures on the surfaces of LED chips by femtosecond laser direct writing. The changed trend of LED light extraction efficiency with the variation of the laser power and pulse was studied. It is found that there is an optimal surface treating condition (laser power and pulse number) in fabricating the microstructures on the surface of the LEDs to make the LED luminous flux maximum. In our experiment, the luminous efficiency of LED is close to the optimum enhancement value when the LED was surface structured with a laser power of 0.48 μW, three laser pulses at one point and the point spacing of 5 μm. In this condition, it can be improved by 23.53%.
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