排序方式: 共有16条查询结果,搜索用时 16 毫秒
1.
2.
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
3.
4.
5.
6.
7.
8.
9.
10.
AlN晶体的物理气相传输(PVT)法生长条件要求苛刻,如0.3~5 atm的高纯氮气生长气氛和2100~2400 ℃的生长温度.结合AlN晶体PVT生长工艺的特点,通过可编程逻辑控制器(PLC)进行适用于氮化铝(AlN)晶体PVT生长装置的智能控制系统的研究.首先,提出了倒置温场的生长工艺以降低AlN晶体PVT生长的成核数量,并通过自动控制程序设计满足不同生长阶段的温场要求;其次,针对设备可能存在超温、超压及冷却水断流等实验安全问题,设计并实现系统的自动化报警及自处理操作;最后,在实验操作上,实现AlN晶体生长的"一键式"全自动化工作. 相似文献