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Effects of the microstructure slab with pillars on light extraction of GaN light-emitting diode 下载免费PDF全文
The positive z direction relative light extraction efficiency of GaN
light-emitting diodes with microstructure slab is calculated by
three-dimensional finite-difference
time-domain method, where the microstructure slab consists of a graphite
lattice of pillars. The
results show that the two-dimensional
graphite-arranged pillars suppress light extraction. When there is a thick
pillar in the middle of the pillars, the structure can enhance light
extraction of the light-emitting diodes. The tower-like pillars, which are
thin on the top of the pillars and thick on the bottom of the pillars,
benefit the light extraction when the angle of the tower-like pillars is
proper. 相似文献
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Supercontinuum generation(SC) of more than one octave spectrum spanning covering from 400 nm to 820 nm was achieved by pumping a piece of aluminum nitride(AIN) single crystal using a nanosecond 355 nm ultraviolet laser. The AlN with a thickness of ~0.8 mm was grown by an optimized physical vapor transport technique and polished with solidification technology. Compared to previously reported ones, the achieved visible SC exhibited the broadest spectrum spanning from bulk materials pumped by a nanosecond pulse laser. The visible supercontinuum in Al N presents new opportunities for bulk material-based white light SC and may find more potential applications beyond typical applications in integrated semiconductive photoelectronic devices. 相似文献